1 & 2 semester VTU 2018 cbcs scheme model question papers

Model Question Paper-1 with effect from 2018-19
(CBCS Scheme)
USN
18CHE12/22
First/Second Semester B.E.Degree Examination
Engineering Chemistry
(Common to all Branches)
Time : 3 Hrs Max.Marks:100
Note: Answer any FIVE full questions, choosing one full question from each module
Module-1
1. a. Define the terms: (i) Free energy, (ii) Entropy & (iii) Cell potential (6 Marks)
b. What are concentration cells? The cell potential of Cu concentration cell
Cu/CuSO4 (0.005M) // CuSO4 (X)/ Cu is 0.0295 V at 25° C.
Write the cell reaction and calculate the value of X. (7 Marks)
c. What are batteries? Explain the construction and working of Li-ion battery,
mention its applications. (7 Marks)
OR
2. a. Write short notes on primary, secondary and reserve batteries. (6 Marks)
b. Explain the construction and working of Ni-MH battery. Mention its applications.
(7 Marks)
c. For the cell, Fe/Fe2+
(0.01M)//Ag+
(0.1M)/Ag write the cell reaction and calculate the
emf of the cell at 298K, if standard electrode potentials of Fe and Ag electrodes are
-0.44V and 0.8 V respectively. (7 Marks)
Module-2
3. a. What is metallic corrosion? Describe the electrochemical theory of corrosion
taking iron as an example. (7 Marks)
b. Explain: (i) Differential metal corrosion & (ii) Water-line corrosion (6 Marks)
c. What is electroplating? Explain the electroplating of chromium (7 Marks)
OR
4. a. What is meant by metal finishing? Mention (any five) technological importance
of metal finishing. (6 Marks)
b. What is electrolessplating? Explain the electrolessplating of copper. (8 Marks)
c. Explain the factors affecting the rate of corrosion (i) Nature of corrosion product,
(ii) Ratio of anodic to cathodic areas & (iii) pH (6 Marks)

18CHE12/22
Module-3
5. a. Define the term Calorific value of fuel. Explain the experimental determination
of calorific value of solid/liquid fuel using Bomb calorimeter. (8 Marks)
b. What are fuel cells? Describe the construction and working of CH3OH-O2 fuel cell.
(6 marks)
c. What are solar cells? Explain the construction and working of a typical PV cell.
(6 marks)
OR
6. a. Explain the production solar grade Si by union carbide process
b. 0.75 g of coal sample (carbon 90%, H2 5% and ash 5%) was
subjected to combustion in Bomb calorimeter. Mass water taken in
the calorimeter was 2.5Kg and the water equivalent of calorimeter is
0.65Kg. The rise in temperature was found to be 3.2o
C. Calculate
gross and net calorific values of the sample. Latent heat of steam
=2457KJ/Kg and specific heat of water = 4.187KJ/ Kg/o
C. (8 Marks)
(6 marks)
c. What is knocking? Explain its mechanism. Mention its ill effects.
(6 Marks)
Module-4
7 a. Explain the mechanism of photochemical smog? (7 Marks)
b. What are the sources, effects and control of lead pollution? (7 Marks)
c. Define COD. In COD test 27.5 cm3
and 13.2 cm3
of 0.05 N FAS solution ere required
for blank and sample titration respectively. The volume of the test sample used is 25
cm3
. Calculate the COD of the sample solution. (6 Marks)
OR
8. a. Define the term COD. Explain the determination of COD. (6 Marks)
b. What is potable water? Describe the process of reverse osmosis process of water.
(7 Marks)
c. What are the causes, effects and disposal methods of e-waste? (7 Marks)
Module-5
9. a. Explain the theory, instrumentation and applications of flame photometry.
(7 Marks)
b. Explain the theory and instrumentation of conductometry. (7 Marks)
c. Explain the synthesis of nano-material by sol-gel technique. (6 Marks)
10. a.
OR
Write a note on graphenes. Mention its applications. (7 Marks)
b. What are nano-materials? Explain the synthesis of nano-materials by
precipitation method (7 Marks)
c. Explain the theory and instrumentation of potentiometry. (6 Marks)

(CBCS Scheme)
USN
18CHE12/22
Engineering Chemistry
Time : 3 Hrs Max.Marks:100
Note: Answer any FIVE full questions, choosing one full question from each module
Module-I
1. a. What is single electrode potential? Derive Nernst equation for single electrode potential.
(6 Marks)
b. Calculate the emf of a Cd-Cu cell in which Cd is in contact with 0.002 M CdSO4 and
Cu in contact with 0.02 M CuSO4 solution. The standard emf of the cell is 0.74 V at
298 K (7 Marks)
c. Explain the construction and working of Ni-MH battery, mention its applications.
(7 Marks)
OR
2. a. Explain the construction and working of Li-ion battery. Mention their advantages and
applications. (7 Marks)
b. What are primary and secondary batteries? Explain with examples. (6 Marks)
c. A concentration cell was constructed by immersing two silver electrodes in 0.05 M and
1M AgNO3 solutions. Give the cell representation, write the cell reactions and calculate
the emf of the cell (7 Marks)
Module-II
3. a. Explain: (i) Water-line corrosion & (ii) Pitting corrosion. (6 Marks)
b. Explain the process of (i) galvanization & (ii) Anodizing (7 Marks)
c. What is electrolessplating? Explain the electrolessplating of nickel. (7 Marks)
OR
4. a. What is meant by metal finishing? Mention (any 6) technological importance
of metal finishing. (7 Marks)
b. Define the terms (i) Polarization, (ii) Decomposition potential & (iii) Over voltage.
(6 Marks)
c. What is cathodic protection? Explain (i) Sacrificial anodic & (ii) Impressed
current methods (7 Marks)

Module-III
5. a. What are chemical fuels? How are they classified? (6 Marks)
b. What are fuel cells? How does a fuel cell differ from a battery? Give their advantages &
disadvantages. (7 marks)
c. Explain the preparation of solar grade silicon by union carbide process. (7 marks)
OR
6. a. What are PV cells? Mention their advantages and limitations.
b. 0.85 g of coal sample (carbon 90%, H2 5% and ash 5%) was
subjected to combustion in a Bomb calorimeter. Mass water taken in
the calorimeter was 2000 g and the water equivalent of calorimeter
was 600 g. The rise in temperature was found to be 3.5o
C. Calculate
gross and net calorific values of the sample. Latent heat of steam
=2457KJ/Kg.
(8 Marks)
(6 marks)
c. Write a note on (i) Power alcohol & (ii) Unleaded petrol
(6 Marks)
Module-IV
7 a. What are the causes, effects and disposal methods of e-waste? (7 Marks)
b. What are the sources, effects and control of mercury pollution? (7 Marks)
c. In a COD test 30.2 cm3
and 14.5 cm3
of 0.05 N FAS solution are required
for blank and sample titration respectively. The volume of the test sample used was 25
cm3
. Calculate the COD of the sample solution. (6 Marks)
OR
8. a. Explain the softening of water by ion exchange method. (6 Marks)
b. Explain the activated sludge treatment of sewage of water. (7 Marks)
c. Explain the mechanism of photochemical smog. (7 Marks)
Module-V
9. a. Explain the theory, instrumentation and applications of atomic absorption spectroscopy.
(7 Marks)
b. Explain the theory and instrumentation of potentiometry (7 Marks)
c. Explain the synthesis of nano-material by sol-gel technique. (6 Marks)
10. a.
OR
Write a note on fullerenes. Mention their applications. (7 Marks)
b. What are nano-materials? Explain the synthesis of nano-materials by
chemical vapor deposition. (7 Marks)
c. Explain the theory and instrumentation of colorimetry. (6 Marks)

(CBCS Scheme)
Elements of Civil Engineering and Mechanics (Common to all Branches) 18CIV14/24
Time: 3 hrs Max. Marks: 100
Note: Answer FIVE full questions, choosing one full question from each module
Module – 1 Marks
1a Briefly explain the role of Civil Engineers in the infrastructure developmentof
country.
8m
b Explain briefly the scope of Civil Engineering in:
a) Water resources engineering b) Geotechnical Engineering.
8m
c State and explain principle of resolved parts. 4m
OR
2a Determine the resultant of the four forces acting on a body as shown in Fig. Q.2 (a)
with respect to point “O”.
Fig. Q.2 (a)
8m
b A truck is to be pulled along a straight road as shown in Fig. Q.2 (b). i) if the force
applied along rope A is 5kN inclined at 30°, what should be the force in the rope B,
which is inclined at 20°, so that vehicle moves along the road. ii) if force of 4kN is
applied in rope B at what angle rope B should be inclined so that the vehicle is
pulled along the road?
Fig. Q.2 (b)
8m
c What is the moment of a force? What are the various moments encountered in
practice? Explain them.
4 m
Module –2
3a What is meant by equilibrium of a rigid body? State the conditions of static
equilibrium for coplanar non-concurrent force system?
4m
b Find the reaction at the contact surface for two identical cylinders weighing 1000N
each as shown in Fig. Q.3. (b)
Fig. Q.3. (b). Fig. Q. 3. (c).
8m
USN

c In the Fig. Q. 3 (c). The portion BC of the string is horizontal and pulley is
frictionless. Determine tension in different parts of the string. Also find W1 and W2.
8m
OR
4a Explain briefly: 1) angle of repose 2) Cone of friction. 4m
b What is the value of `P` in the system shown in Fig. Q.4 (b) to cause the motion to
impend? Assume the Pulley is smooth and the coefficient of friction between the
other contact surfaces is 0.2.
Fig. Q.4 (b)
8m
c A uniform ladder of length 20m rests against a vertical wall with which it makes an
angle of 45°, the coefficient of friction between the ladder and the wall and ground
respectively being 1/3 and 1/2. If a man, whose weight is one half that of the ladder
ascends the ladder, how high will he be, when the ladder slips?
8m
Module –3
5a With sketch explain different types of supports and mark reaction line. 6m
b A simply supported beam AB of length 10m carries the uniformly distributed load
of intensity 20 kN/m over a length of 4m at a distance 2m from left support and two
point loads 50kN and 60kN a distance 2mand 6m from left support respectively
calculate the reaction RA and RB.
14m
OR
6a List the steps followed in the analysis of truss by method of sections. 6m
b Find the support reactions and member forces for pin jointed plane truss shown in
Fig. Q. 6 (b).By method of joints.
Fig. Q. 6 (b).
14m
Module –4
7a Derivation of expression for centroid of Rectangle. 6m
b Locate the centroid of the shaded area shown in the Fig.Q.7 (b).with respect to OX
and OY
Fig.Q.7 (b).
14m
OR
8a State and prove Parallel axis theorem 6m

b Determine the second moment of the area about the horizontal centroidal axis as
shown inFig. Q. 8. (b). Also find radius of gyration.
Fig. Q. 8. (b)
14m
Module –5
9a Define Acceleration, Uniform acceleration, Variable acceleration andAcceleration
due to gravity
4 m
b A particle, starting from rest, moves in a straight line, whose equation of motion is
given by s=5t3
-3t2
+6. Find the displacement, velocity and acceleration of the particle
after 5 seconds.
8m
c A stone is dropped into well and the splash of sound is heard after 9 seconds.
Determine the height of drop from the water surface. Assume velocity of sound to
be 330m/sec.
8m
OR
10a Explain briefly Rectilinear motion and Curvilinear motion. 4m
b State D'Alembert's principle and mention its applications in Plane Motion. 8m
c A particle is projected with a velocity of 20m/s in air at angle ‘a’ with the horizontal.
The x and y co-ordinates of a point lying on the trajectory of the particle with
respect to point of projection are 20m and 8m respectively. Find the angle of
projection of the particle.
8m

(CBCS Scheme)
Elements of Civil Engineering and Mechanics (Common to all Branches) 18CIV14/24
Time: 3 hrs Max. Marks: 100
Module – 1 Marks
1a Define force and state its characteristics. 4m
b Explain briefly the scope of Civil Engineering in:
a) Structural Engineering. b) Transportation Engineering.
8m
c Write a note on the role of Civil Engineers in the infrastructure development of
country.
8m
OR
2a Find the moment of force F = 600N about ‘A’ as shown in Fig.Q.2(a)
Fig. Q.2 (a)
4m
b To move a boat uniformly along the river at a given speed, a resultant force R=520N
is required. Two men pulling with forces P and Q by means of ropes with angle
ɵ1and ɵ2 respectively. If
a. ɵ1 = 30o
and ɵ2 = 40o
find P and Q,
b. ɵ1 = 30o
and P=400 N find Q and ɵ2
8m
c State and prove Varignon’s theorem of moments 8m
Module –2
3a State and prove Lami’s theorem. 4m
b Determine the Magnitude and Y-Intercept of the resultant force system acting on the
lamina as shown in Fig. Q.3(b).
Fig. Q.3. (b). Fig. Q. 3. (c).
8m
c Two Spheres each of radius 100mm and weight 5kN is in a rectangular box as
shown in Fig. Q. 3 (c). Calculate the reactions at all the points of contact.
8m
OR
4a Distinguish between Static friction and kinetic friction. 4m
b A block Weighing 4000 N is resting on horizontal surface supports another block of
2000 N as shown in Fig. Q.4 (b), Find the horizontal force F just to move the block
to the left. Take coefficient of friction for all contact surfaces as 0.2.
Fig. Q.4 (b)
8m
USN

c A uniform ladder of length 15 m rests against a vertical wall making an angle 60o
with the horizontal. Coefficient of friction between wall and the ladder is 0.30 and
between ground and ladder is 0.25. A man weighing 500N ascends the ladder. How
long will he able to go before the ladder slips? Find the weight that is necessary to
be put at the bottom of the ladder so as to be just sufficient to permit the man to go
to the top. Assume weight of the ladder to be 850 N.
8m
Module –3
5a What is meant by equilibrium of a rigid body? State the conditions of static
equilibrium for coplanar non-concurrent force system?
6m
b Solve for the distance X such that the reaction RA an RB is equal for the beam
shown in Fig. Q.5 (b).
Fig. Q.5(b)
14m
OR
6a List the steps followed in the analysis of truss by method of Joints 6m
b Find the support reactions and member forces for pin jointed plane truss shown in
Fig. Q. 6 (b).
Fig. Q. 6 (b).
14m
Module –4
7a Derivation of expression for centroid of Triangle. 6m
b Locate the Centroid of geometrical Fig.Q.7 (b). Shown with respect to horizontal
axis.
Fig.Q.7 (b).
14m
OR
8a State and prove Parallel axis theorem 6m
b Obtain the Moment of Inertia and the radius of gyration of the shaded area shown in
Fig. Q. 8. (b) With respect to X and Y axis. 14m

Fig. Q. 8. (b)
Module –5
9a Define displacement, Velocity, Distance Travelled, Speed and Acceleration. 4 m
b A vehicle is moving with variable acceleration and its motion is given by the
equation s= 25t +4t2
-6t3
, where‘s’ is in m and‘t’ is in seconds. Determine (i) the
velocity and acceleration at start (ii) the time, when the vehicle reaches its
maximum velocity (iii) the max velocity of the vehicle.
8m
c An aircraft moving horizontally at 120 kms/hr speed at an elevation of 1200m
targets a point on the ground and releases a bomb which hits it. Determine the
horizontal distance of the aircraft (position when it releases the bomb) from the
target. Also calculate the velocity and direction with which bomb hits the target.
8m
OR
10a State Newton’s Laws of Motion 4m
b State D'Alembert's principle and mention its applications in Plane Motion. 8m
c A particle is projected in air with a velocity of 120 m/sec at an angle of 300
with the
horizontal. Determine (i) the horizontal range (ii) the max height by the particle (iii)
the time of flight.
8m

First/Second Semester B.E Degree Examination
Basic Electrical Engineering “18ELE13”
Time: 3 Hours Max. Marks:100
Note:Answer any FIVE full questions, choosing one full question from each module.
Module-1
1. a) State and explain Ohm’s law and mention its limitations. (6 Marks)
b) Explain the generation of single phase A.C induced EMF with suitable diagrams. (6 Marks)
c Two 12 V batteries with internal resistance 0.5 and and 1 respectively are joined in parallel
and a resistance of 2 is placed across the terminals. Find the current supplied by each battery.
(8 Marks)
OR
2. a) State and explain Kirchoff’s laws. (6 Marks)
b)Define RMS value of alternating current ,show that its value is proportional to maximum
value. (6 Marks)
c)Calculate currents in each resistors, total power and power dissipated in each resistors for below
shown circuit diagram. (8 Marks)
Module-2
3. a) Show that current ‘i’ lags the applied voltage ‘v’ by 900
for a pure inductance A.C circuit and
also power consumed is zero (6 Marks)
b)Derive the voltage and current relations in a balanced 3 phase star connected load with suitable
circuit and vector diagrams. (7 Marks)
c) A series RLC circuit with 100 , 25µF and 0.15H is connected across 415V,50Hz AC supply. Calculate
i) impedance ii) current iii) power factor iv) voltage drop across inductor and capacitor.
(7 Marks)
OR
4. a) Show that two wattmeters measure three phase power with suitable circuit diagram and vector diagrams.
(8 Marks)
Page(1 of 2)

b) A 318 µF capacitor is connected across a 230 volts, 50 Hz system. Determine i) capacitive reactance ii)
RMS value of current iii) voltage and current expressions. (6 Marks)
c) Three arms of a 3 phase, delta connected load, each comprises of a coil having 25 resistance and 0.15
inductance in series with a capacitor of 120µF across 415V, 50 Hz supply. Calculate i) line current ii)
power factor iii) power consumed. (6 Marks)
Module-3
5. a) Explain the working principle of transformer and list the applications of transformer. (6 Marks)
b) A 40KVA, single phase transformer has core loss of 450 Watts and full load copper loss 850 Watts. If
the power factor of the load is 0.8. Calculate i) Full load efficiency ii) Maximum efficiency at UPF iii)
Load for maximum efficiency. (8 Marks)
c) Explain 2 way control and 3 way control of lamp with suitable circuit diagrams and working table.
(6 Marks)
OR
6. a) Derive an EMF equation of transformer with usual notations. (6 Marks)
b)List different types of loss in transformer and explain each one in brief. (8 Marks)
c) Explain the term equipment earthing and explain any one type earthing with a neat diagram.
(6 Marks)
Module-4
7. a) Explain the working principle of D.C motor with suitable diagrams. (6 Marks)
b) Derive an EMF equation for D.C generator with usual notations. (6 Marks)
c) A 4 pole, DC shunt motor takes 22.5 A from a 250 V supply . The armature resistance is 0.5 Ohms and
field resistance is 125 Ohms. The armature is wave wound with 300 conductors. If the flux pet pole is
0.02 Wb. Calculate i) Speed ii) Torque developed iii) Power developed. (8 Marks)
OR
8.a) Discuss the following characteristics for i) series motor ii) shunt motor with relevant plots.
i) Ta v/s Ia ii) N v/s Ia (6 Marks)
b) Explain the function of following parts of D.C machine. (6 Marks)
i) Yoke ii) Field winding iii) Commutator iv) Pole shoe v) Pole core vi) Brush
c) A 4 pole, lap wound DC shunt generator delivers 200 A at terminal voltage of 250 Volts. It has a field
and armature resistance of 50 Ohms and 0.05 Ohms respectively. Neglecting brush drop determine i)
Armature current ii) Current per parallel path iii) EMF generated iv) Power developed. (8 Marks)
Module-5
9.a) Explain the working principle of 3 phase synchronous generator. (6 Marks)
b) A 6 pole, 3 phase, 50 Hz, alternator has 12 slots per pole and 4 conductors per slot. A flux of 25mWb is
sinusoidally distributed along the air gap. Determine the i) phase EMF ii) Line EMF . Assume coils are
full pitched and winding factor as 0.96. (6 Marks)
c) Explain the concept of rotating magnetic field and show that resultant EMF remains same at different
instants of time. (8 Marks)
OR
10. a) Derive an EMF equation for 3 phase synchronous generator with suitable considerations.
(6 Marks)
b) Describe the constructional features of 3 phase induction motor with suitable diagrams.
(8 Marks)
c) An 8 pole 3 phase alternator runs at 750RPM and supplies power to 6 pole 3 phase induction motor
which runs at 970 RPM. What is the slip of the induction motor? (6 Marks)
Page(2 of 2)

FirstSemester B.E. Degree Examination, Jan 2019
18ELE 15/25BASIC ELECTRICAL ENGINEERING
Time: 3 hrs. MODEL PAPER Max. Marks: 100
Module – 1
1 a
.
A resistance of 10Ω is connected in series with two resistances each of
15Ω arranged in parallel. What resistance must be shunted across this
parallel combination so that the total current taken shall be 1.5A with 20V
applied?
6 marks
b
.
For the given circuit calculate the value of the current in either branch and
the value of the unknown resistance R when the total current taken by the
network is 2.25 A.
6 marks
c
.
Define the following with respect to sinusoidal alternating quantity: (i)
Average Value, (ii) RMS value, iii) Form factor and (iv) peak factor
8 marks
OR
2 a
.
Define RMS value of a sinusoidal alternating quantity and derive an
expression for it.
6 marks
b
.
Two resistors are connected in parallel and a voltage of 200V is applied to
the terminals. The total current taken is 25A and the power dissipated in
one of the resistors is 1500W. What is the resistance of each element?
6 marks
c
.
Find current in the battery, the current in each branch and p.d. across AB
in the network shown in fig.2(c)
8 marks
Module – 2
3 a Show that in a pure inductor the current lag behind the voltage by 90ᵒ.
Also draw the voltage and current waveforms.
6marks
b A series RLC circuit is composed of 100 Ohms resistance,1.0 H inductance and8 marks

5µF capacitance. A voltage,V(t)=141.4 Cos377t volts is applied to the
circuit.Determine the current and vlotages VR , VL and VC
c With the help of a phasor diagram show that in a three phase star
connected system the line to line voltage is √3 Ɵmes the phase to neutral
voltage
6 marks
OR
4 a Derive an expression for power in a single phase R-L series circuit in terms
of voltage, current and power factor of the circuit.
6marks
b Given v=200 sin 377t volts and i=8 sin(377t-30°) amps for an a.c. circuit,
determine :a)Power factor b)True power c)Apparent power d)Reactive
power indicate the unit of power calculated
8 marks
c Three identical coils.each having a resistance of 10 and a reactanece of
10 are connected in delta,across 400 V,3-phase supply.Find the line
current and the reading on the two Wattmeters conneted to measure the
power.
6 marks
Module – 3
5 a Derive the equation for the induced emf in a single phase transformer 6 marks
b With a neat connection diagram explain three way control of lamp. Also
develop the truth table indicating the state of the lamp for different
positions of the switches.
6 marks
c A transformer is rated at 100KVA. At full load its copper loss is 1200 W and
its iron loss is 960 W. Calculate (a) the efficiency at full load, unity power
factor (b) efficiency at half full load, 0.8 power factor (c) the load KVA at
which maximum efficiency will occur and (d) Maximum efficiency at 0.85
power factor
8 marks
OR
6 a Explain the principle of transformer and compare the core and shell type
transformer.
6 marks
b A single phase 50 Hz core type transformer has a square core of 20 cm
side. The permissible maximum density is 1 Wb / m2. Calculate the
number of turns per limb on the high and low voltage sides for a 3000 /
220 V ratio
6 marks
c What is earthing? Why earthing is required? With the help of sketch
explain plate earthing.
8 marks
Module – 4
7 a 8 marks
b 6 marks
c 6 marks
OR
8 a 6 marks
b 6 marks
c 8 marks
Module – 5

9 a 8marks
b 6 marks
c 6 marks
OR
10 a 8 marks
b 4 marks
c 8 marks

First/Second Semester B.E Degree Examination
Basic Electrical Engineering “18ELE13”
Time: 3 Hours Max.Marks:100
Note:Answer any FIVE full questions, choosing one full question from each module.
Module 1
1. a) State and explain Kirchhoff’s laws with example.(7 Marks)
b)Find the current in all the branches of the network shown. (7 Marks)
c) Define Average value of alternating current and derive an expression for it in terms
of maximum value. (6 Marks)
OR
2. a) Explain the phasor representation of alternating quantities with suitable diagrams.
(6 Marks)
b) What is the potential between the point x and y in the network shown below?
(6 Marks)
c) If the total power dissipated in the circuit shown below is 18W, find the value of R
and its current. (8 Marks)

Module 2
3. a) Obtain expression for the current through the pure inductor and show that power
consumed is zero. (6 Marks )
b) Obtain the relationship between line and phase voltages and currents in threephase
balanced delta connected system (8
Marks)
c) Two impedances z1= (6-8i) Ω and z2= (16+12i) Ωare connected in parallel. If the
total current of the combination is (20+10i) amperes, find (i) Voltage across the
combination (ii) Currents in the two branches. (6 Marks)
OR
4. a) List out the advantages of three phase system as compared to single phase system (
6 Marks)
b) What is meant by power factor in AC circuit? What is its significance in AC
Circuits? (6 Marks)
c) A balanced star connected load of (8+6i)Ω/phase is connected to 3phase 230V
supply. Find the line current, power factor, power reactive volt-ampere.(8 Marks)
Module 3
5. a) Derive the condition for which the efficiency of a transformer is maximum.
(6 Marks)
b) Define earthing. List the different type of earthing and explain anyone with a neat
diagram. (7 Marks)
c)A single phase 20KVA transformer has 1000turns and 2500 secondary turns. The
net cross section area of the core is 100cm2
. When the primary winding is connected
to 550V, 50Hz supply, calculate (i) the maximum value of the flux density in the core,
(ii) the voltage induced in the secondary winding and (iii) the primary and secondary
full load currents. (7
Marks)
OR
6. a) Derive emf equation of a transformer. (6 Marks)
b) Write a short note (i) MCB. (ii) Precautions against electric shock. (8 Marks)
c) With a neat sketch and truth table explain 2 way and 3 way control of lamp.
(6 Marks)
Module 4
7. a) With a neat sketch explain the construction of the various parts of DC Generator
(8 Marks)
b) Derive the torque equation of DC motor with usual notations. (6 Marks)
c) A 200V,4 Pole , lap wound DC shunt motor has 800 conductors on its armature .
The resistance of the armature winding is 0.5Ω and that of the shunt field winding is
200Ω. The motor takes 21A and flux /pole is 30mWb. Find speed and gross torque
developed in the motor.
(6 Marks)
OR
8. a) Derive emf equation of a DC Generator. (6 Marks)

b) Discuss about various characteristics of a DC series motor with neat diagrams.
(6 Marks)
c) A 30 kW, 300V DC shunt generator has armature and field resistances of 0.05Ω
and 100Ω respectively. Calculate the power developed by the armature when it
delivers full output power. (8 Marks)
Module 5
9. a) Describe the constructional features of synchronous generator with suitable
diagram.
(6 Marks)
b) Define slip and slip speed. Derive an expression for frequency of rotor current with
suitable considerations. (6 Marks)
c) A 12pole 500rpm star connected alternator has 48slots with 15 conductors per slot.
Flux per pole is 0.02Wb. The winding factor is 0.97 and pitch factor is 0.98. Calculate
the phase emf and line emf.
OR
10. a) Derive the emf equation of Synchronous Generator. (6 Marks)
b) With a circuit diagram explain the working of a star delta starter for a three
phase induction motor. (7 Marks)
c) A three phase 6 pole 50Hz induction motor has a slip of 1% at no load and 3% at
full load. Determine: i) Synchronous speed, ii) No load speed iii) Full load speed,iv)
frequency of rotor current at stand still. v) Frequency of rotor current at full load.
(7 Marks)

18ELN14/24
Visvesvaraya Technological University, Belagavi
MODEL QUESTION PAPER
1st
/2nd
Semester, B.E (CBCS 2018-19 Scheme)
Course: 18ELN14/24- BASIC ELECTRONICS – Set no.1
Time: 3 Hours Max. Marks: 100
Note: (i) Answer Five full questions selecting any one full question from each Module.
(ii) Question on a topic of a Module may appear in either its 1st
or/and 2nd
question.
Module-1 Marks
1 a Explain the operation of p-n junction diode under forward and reverse biased
condition
8
b Explain how Zener diode can be used as a voltage regulator 6
c A diode circuit shown below has E=1.5V, R1=10 ohm. By assuming Vf=0.7V, calculate If
for
i) rd = 0
ii) rd = 0.25 ohm
Fig.Q.1(c)
6
OR
2 a With a neat circuit diagram and waveform, explain the working of half-wave rectifier
and derive the expression for average load current.
8
b Explain briefly the operation of a capacitor filter circuit. 6
c Explain the operation of 7805 fixed IC voltage regulator. 6
Module-2

3 a Explain the characteristics of N-channel JFET. 8
b For E-MOSFET, determine value of ID, if ID (ON)= 4mA, Vgs(ON)=6V, VT=4V and Vgs=8V. 4
c Explain the construction and working of P-channel enhancement type MOSFET. 8
OR
4 a Draw and explain the operations of SCR using 2-transistor equivalent circuit. 8
b Explain phase controlled application of SCR. 6
c Explain the operation of a CMOS inverter. 6
Module-3
5 a For an op-amp (i) List the characteristics of an ideal op-amp and (ii) Draw the three
input inverting summer circuit and derive an expression for its output voltage.
8
b Define the terms
i) Slew rate
ii) CMRR
iii) Common mode gain AC of op-amp
6
c Design an adder circuit using an op-amp to obtain an output voltage of Vo=
-[2V1+3V2+5V3]
6
OR
6 a Draw the working of an inverting op-amp. Derive the expression for its voltage gain. 8
b With a neat diagram, explain how an op-amp can be used as a differentiator. 6
c Find the output Vo of following op-amp circuit.
Fig.Q.6(c)
6

Module-4
7 a Explain the operation of BJT as an amplifier and as a switch. 8
b What is a feedback amplifier? Briefly explain different types of feedback amplifiers. 6
c Draw and explain the operation of a voltage series feedback amplifier and derive an
expression for its voltage gain with feedback.
6
OR
8 a Explain the Barkhausens’ criteria for oscillations. 6
b Explain the operation of an RC phase shift oscillator. 6
c Explain the working of an Astable oscillator constructed using IC- 555 timer. 8
Module-5
9 a Convert the following.
i) (725.25)10=( ? )2 = ( ? )16
ii) (111100111110001)2= ( ? )10 = ( ? )16
8
b Simplify the following expressions and draw the logic circuits using basic gates.
i) AB+ ´AC+ A ´BC (AB+C)
ii) (A+´B)(CD+E)
6
c Realize a full adder circuit using 2 half adders. 6
OR
10 a What is a multiplexer? Explain the working of 4:1 multiplexer. 6
b With the help of a logic diagram and truth table, explain the working of a clocked SR
flip-flop.
6
c What is a shift register? Explain the working of a 4-bit SISO shift register. 8
**********

18ELN14/24
1st
/2nd
Semester, B.E (CBCS 2018-19 Scheme)
Course: 18ELN14/24- BASIC ELECTRONICS – Set no. 2
Time: 3 Hours Max. Marks: 100
Note: (i) Answer Five full questions selecting any one full question from each Module.
(ii) Question on a topic of a Module may appear in either its 1st
or/and 2nd
question.
Module-1 Marks
1
a. Explain the operation of PN junction diode under forward and reverse bias conditions 6M
b.
A full wave bridge rectifier with an input of 100V(rms) feeds a load of 1kΩ .VΩ .VT=0.7V
(i) If the diodes employed are of silicon, what is the dc voltage across the load?
(ii) Determine the PIV rating of each diode..
(iii) Determine the maximum current that each diode conducts and the diode power rating.
6M
c.
Write a short note on
(i) Light emitting diode and (ii) Photo coupler 8M
OR
2
a.
What is Zener diode? With neat circuit diagram, explain the operation of a voltage regulator with and
without load?
8M
b. A silicon diode has IS=10nA operating at 25°C. Calculate In for a forward bias of 0.6V. 4M
c.
Define rectifier. SkΩ .Vetch a centre tapped full wave rectifier and derive the following. Show the
appropriate waveforms.
(i) Average Voltage (ii) Efficiency and (iii) Ripple factor 8M
Module-2
3
a. Explain the construction and operation of JFET with necessary diagram. 7M
b. Draw and explain the V-I characteristics of SCR. 6M
c. With neat circuit diagram, explain the workΩ .Ving of CMOS inverter. 7M
OR
4
a. What is MOSFET? Explain D- MOSFET and E- MOSFET transfer characteristics. 8M
b. A certain JFET has an IGSS of -2nA for VGS= -20V Determine the input resistance. 4M
c. What is SCR? Explain the workΩ .Ving of two transistor model of SCR. 6M
Module-3
5 a. Describe the characteristics of basic Op-Amp. List out its ideal characteristics. 8M
b.
A certain op-amp has an open loop voltage gain of 1,00,000 and a common mode gain of 0.2.
Determine the CMRR and express it in decibels.
4M
c. Derive the output voltage for the following
(i) Integrator and (ii) Voltage follower
8M

OR
6
a.
Explain the following terms related to op-amp
(i) CMRR (ii) Offest Voltage and Current (iii) Slew rate and (iv) Input bias
8M
b. Design an adder using op-amp to give the output voltage VO= - [2V1+3V2+5V3]. 6M
c. Derive the output voltage of a non-inverting amplifier. 6M
Module-4
7
a. What is an amplifier? Explain the operation of transistor amplifier circuit. 8M
b.
Define feedbackΩ .V amplifier? With necessary diagram and equation explain the different types of
feedbackΩ .V?
12M
OR
8
a. Briefly explain how a transistor is used as an electronic switch. 6M
b. Explain how 555 timer can be used as an oscillator. 6M
c. Define an oscillator? Derive the equation for Wien bridge oscillator. 8M
Module-5
9
a.
Perform the following
(i) Convert (A B C D)16 =(?)2=(?)8=(?)10
(ii) Subtract (1010)2-(111)2 using 2’s compliment method.
5M
b. Realize Y=AB+CD+E using NAND gates. 4M
c. What is a flip flop? Explain the Master Slave JK flip flop operation. 5M
d. With a neat blockΩ .V diagram explain GSM system. 6M
OR
10
a.
Perform the following
(i) Convert (111110101101)2 to ( )8
(ii) Subtract (22)2-(17)2 using 1’s and 2’s compliment method.
5M
b. Design full adder circuit using three variables and implement it using two half adders. 8M
c.
What is a counter? With a neat timing and blockΩ .V diagram, explain three bit asynchronous counter
operation.
7M
**********

18ELN14/24
1st
/ 2nd
Semester, B.E (CBCS)
Course: 18ELN14/24- Basic Electronics – Set no. 3
Note: (i) Answer five full questions selecting any one full question from each module.
(ii) Missing data may be suitably assumed
Time: 3 Hrs Max. Marks: 100
MODULE 1
1 a Explain the forward and reverse bias condition for a pn junction diode with
neat diagram.
08M
b A half wave rectifier is fed from a supply of 230 V, 50 Hz with step down
transformer of ratio 3:1. Resistive load connected is 10 KΩ. The diode forwardΩ. The diode forward
resistance is 75Ω and transformer secondary is 10 Ω. Calculate the DC load
current, DC load voltage, efficiency and ripple factor.
06M
c Write a short note on the following:
(i) Photo diode (ii) Light emitting diode
06M
OR
2 a With neat circuit diagram and wave forms explain the working of a centre
tapped full wave rectifier.
08M
b A Zener diode has a breakdown voltage of 10V. It is supplied from a voltage
source varying between 20-40V in series with a resistance of 820Ω. Using an
ideal Zener model, obtain the minimum and maximum Zener currents
06M
c Explain the features of LM7805 fixed regulator. 06M
MODULE 2
3 a Explain the construction and operation of a p-channel JFET 08M
b With neat diagram explain the operation of a CMOS inverter. 06M
c With neat diagram explain the VI characteristics of an SCR. 06M
OR
4 a Explain the characteristics of an n-channel JEFT. 06M
b With neat diagram, explain the characteristics of a enhancement type
MOSFET.
08M
c With neat diagram explain the two transistor model of an SCR. 06M

MODULE 3
5 a Explain the following with respect to op-amp
(i) Input Impedance (ii) output impedance (iii) Slew rate (iv) CMRR (v) virtual
ground
10M
b Derive an expression for the output voltage of an inverting amplifier. 06M
c The input to the basic differentiator circuit is a sinusoidal voltage of peak
value of 10mV and frequency 1.5KΩ. The diode forwardHz. Find the output if, Rf=100KΩ. The diode forwardΩ and
C1=1μF.F.
04M
OR
6 a Derive an expression for the output voltage of an op-amp integrator. 06M
b Derive an expression for the output voltage of an inverting summer. 06M
c A non-inverting amplifier circuit has an input resistance of 10KΩ. The diode forwardΩ and
feedback resistance 60KΩ. The diode forwardΩ with load resistance of 47KΩ. The diode forwardΩ. Draw the circuit.
Calculate the output voltage, voltage gain, load current when the input voltage
is 1.5V.
08M
MODULE 4
7 a Explain how the transistor can be used as a switch and as an amplifier. 10M
b
An amplifier has a high frequency response described byA=
A 0
1+( jωω/ω2)
.
Where in A0=1000, ω2=104 rad/s. Find the feedback factor which will raise the
upper corner frequency ω2 to 105 Hz. What is the corresponding gain of the
amplifier? Find also the gain bandwidth product in this case.
04M
c With a neat circuit diagram, explain the working of RC phase shift oscillator. 06M
OR
8 a List the advantages of negative feedback in an amplifier. Explain the voltage
series feedback amplifier. Show that the gain band width product for a
feedback amplifier is constant.
10M
b The frequency sensitivity arms of the Wein bridge oscillator uses
C1=C2=0.01μF.F and R1=10KΩ. The diode forwardΩ while R2 is kept variable. The frequency is to be
varied from 10KΩ. The diode forwardHz to 50 KΩ. The diode forwardHz by varying R2. Find the minimum and
maximum values of R2.
04M
c With a neat diagram explain the Astable operation of IC 555 timer. 06M
MODULE 5
9 a Simplify the following Boolean expressions
(i) Y=A ´B+ AB
(ii) Y=AB+ AC+BD+CD
(iii) Y=(B+CA )(C+ Á B)
(iv) Y= Á ´B Ć ´D+ Á ´B Ć D+ A ´B Ć ´D+ A ´B Ć D
08M
b With a neat circuit diagram and truth table, explain the working of a JKΩ. The diode forward flip
flop.
06M

c With a neat diagram, explain the working of a communication system. 06M
OR
10 a Simplify and realize the following using NAND gates only
(i) Y=AC+ ABC+ Á BC+ AB+ D
(ii) Y=A ´B Ć+ Á ´B Ć+ Á ´B+ Á Ć
08M
b With a neat circuit diagram and truth table, explain the full adder circuit. 06M
c With a neat block diagram, explain the operating principle of the GSM system. 06M

of 2
(CBCS Scheme)
18MAT11USN
First Semester B.E. Degree Examination
Calculus and Linear Algebra
Time: 3 Hrs Max.Marks: 100
Note: Answer any FIVE full questions, choosing at least ONE question from each module.
Module-1
1. (a) With usual notation, prove that  drdr  tan . (06 Marks)
(b) Find the radius of curvature at the point  aa 3,3 on the curve axyyx 333
 . (06 Marks)
(c) Show that the evolute of the ellipse: 12222
 byax is       32223232
babyax  (08 Marks)
OR
2. (a) Find the pedal equation of the curve : .cos1 erl  (06 Marks)
(b) Find the radius of curvature for the curve    raaar 122
cos
 at any point on it. (06 Marks)
(c) Show that the angle between the pair of curves:  2sin16&42sin 22
 rr is .3 (08 Marks)
Module-2
3. (a) Using Maclaurin’s series, prove that   ...
246
tanseclog
53

xx
xxx (06 Marks)
(b) Evaluate (i)    






 a
x
ax
ax 2
tan
2lim

(ii)    x
x
x
sin2
0
1lim

(07 Marks)
(c) Examine the function     4422
2, yxyxyxf  for its extreme values. (07 Marks)
OR
4. (a) If  xzzyyxfu 24,43,32  , show that       0413121  zyx uuu (06 Marks)
(b) If  cos,sinsin,cossin rzryrx  , show that      .sin,,,, 2
 rrzyxJ  (07 Marks)
(c) A rectangular box, open at the top, is to have a volume of 32 cubic ft. Find the dimension of
the box requiring least material for its construction. (07 Marks)
Module-3
5. (a) Evaluate  dxdye yx

 

0 0
22
by changing into polar coordinates. (06 Marks)
(b) Find the volume the tetrahedron bounded by the plane 1
c
z
b
y
a
x
and the coordinate planes,
using double integration. (07 Marks)
(c) Show that
2200
2
2

 


 
dxex
x
dxe x
x
(07 Marks)

of 2
OR
6. (a) Evaluate:   
 

1
0
1
0
1
0
222
2 22
1
x yx
zyx
dxdydz
(06 Marks)
(b) Find by double integration, the centre of gravity of the area of the cardioid:  .cos1  ar (07 Marks)
(c) With usual notations, show that
 
 .,
1
1
0
11
nmdx
x
xx
nm
nm



 

(07 Marks)
Module-4
7. (a) A copper ball originally at C0
80 cools down to C0
60 in 20 minutes, if the temperature of the
air being .400
C What will be the temperature of the ball after 40 minutes from the original? (06 Marks)
(b) Find the orthogonal trajectories of the family of curves nn
anr cos ,where a is a parameter. (07 Marks)
(c) Solve :    .0223 23342
 dyxyxdxxyyx (07 Marks)
OR
8. (a) Solve the differential equation   ,300sin200 tRidtdiL  when 05.0L & 100R and
find the value of the current i at any time t, if initially there is no current in the circuit. What
value does i approach after a long time. (06 Marks)
(b) Solve :    .0cossin 2
 drdrr  (07 Marks)
(c) Solve:     022212 234
 xyppxyyxpyxp , where .dxdyp  (07 Marks)
Module-5
9. (a) For what values  and  the system of equations   zyxzyxzyx 2;1032;6 ,
has (a) no solution (b) a unique solution and (iii) infinite number of solutions. (06 Marks)
(b) Using Rayleigh’s power method, find largest eigen value and eigen vector of the matrix:













512
132
114
by taking  0
X = T
0,0,1 as initial eigen vector.(Perform 7 iterations) (07 Marks)
(c) Use Gauss-Jordan method solve the system of equations:
712983;10413527;9541183  zyxzyxzyx (07 Marks)
OR
10. (a) Find the rank of the matrix













512
132
114
by applying elementary row operations. (06 Marks)
(b) Reduce the matrix 






12
21
A into the diagonal form. (06 Marks)
(c) Solve the system of equations 18203;17220;252032  zyxzyxzyx , (07 Marks)
using Gauss-Seidel method. (Carry out 4 iterations).
*****

of 2
(CBCS Scheme)
18MAT11USN
First Semester B.E. Degree Examination
Calculus and Linear Algebra
Time: 3 Hrs Max.Marks: 100
Note: Answer any FIVE full questions, choosing at least ONE question from each module.
Module-1
1. (a) With usual notation, prove that  2422
111 ddrrrp  . (06 Marks)
(b) For the cardiod :  cos1 ar , show that r2
 is constant. (06 Marks)
(c) Show that the evolute of the parabola axy 42
 is  32
2427 axay  . (08 Marks)
OR
2. (a) Find the pedal equation of the curve : )sin(cos  mmar mm
 . (06 Marks)
(b) Show that the radius of curvature for the catenary  cxcy cosh at any point  yx, varies
as square of the ordinate at that point. (06 Marks)
(c) Show that the angle between the pair of curves:  log&log arar  is .tan2 1
e
(08 Marks)
Module-2
3. (a) Using Maclaurin’s series, prove that ...
2432
12sin1
432

xxx
xx (06 Marks)
(b) Evaluate (i)    xxxx
x
cba
1
0
3lim 

(ii)    x
x
x


2
2
coslim


. (07 Marks)
(c) Examine the function   20123, 33
 yxyxyxf for its extreme values. (07 Marks)
OR
4. (a) Find dtdu at ,0t if
222
zyx
eu 
 and tzttytx sin,cos,12
 . (06 Marks)
(b) If zxywyzxvxyzu  ,, , then show that     4,,,,  zyxwvu . (07 Marks)
(c) Find the maximum and minimum distances of the point  3,2,1 from the sphere .56222
 zyx (07 Marks)
Module-3
5. (a) Evaluate :  dydxdzzyx
z zx
zx  



1
1 0
(b) Find by double integration the area lying between the circle 222
ayx  and the line
ayx  in the first quadrant. (06 Marks)
(c) Show that 



 
2
0
2
0
sin
sin
d
d
(07 Marks)
OR

of 2
6. (a) Change the order of integration and hence evaluate  
1
0
2
2
x
x
dxdyxy . (06 Marks)
(b) A pyramid is bounded by three coordinate planes and the plane 632  zyx .
Compute the volume by double integration. (07 Marks)
(c) Evaluate:   dxxx
21
1
0
23
1 , by expressing in terms beta & gamma functions. (07 Marks)
Module-4
7. (a) If the temperature of the air is C0
30 and a metal ball cools from C0
100 to C0
70 in 15
minutes, find how long will it take for the metal ball to reach a temperature of .400
C (06 Marks)
(b) Find the orthogonal trajectories of the family of curves     ,122222
 dybydxax 
where  is a parameter. (07 Marks)
(c) Solve :    .0422 434
 dyxyxydxyy (07 Marks)
OR
8. (a) The current i in an electrical circuit containing an inductance L anda resistance R in series
and, acted upon an e.m.f. tE sin satisfies the differential equation   .sin tERidtdiL 
Find the value of the current at any time t, if initially there is no current in the circuit. (06 Marks)
(b) Solve:   0cos2sin 23
 dxyxyxdy (07 Marks)
(c) Find the general and singular solution of    ,2ppyxypx  by using the substitution
vyux  22
& (07 Marks)
Module-5
9. (a) Find the rank of the matrix















5114
1352
35110
2131
by applying elementary row operations. (06 Marks)
(b) Using Rayleigh’s power method, find largest eigen value and eigen vector of the matrix:










 402
031
2125
by taking  0
X = T
0,0,1 as initial eigen vector.(Perform 7 iterations) (07 Marks)
(c) Use Gauss-Jordan method solve the system of equations:
43;126;54  zyxzyxzyx (07 Marks)
OR
10. (a) For what values  and  the system of equations   zyxzyxzyx 52;953;632 ,
has (a) no solution (b) a unique solution and (iii) infinite number of solutions. (06 Marks)
(b) Reduce the matrix 








1642
719
A into the diagonal form. (07 Marks)
(c) Solve the system of equations 9541183;712983;10413527  zyxzyxzyx ,
using Gauss-Seidel method. (Carry out 4 iterations). (07 Marks)
*****

18ME15/25
Model Question Paper
First Semester B.E. Degree (CBCS) Examination
Elements of Mechanical Engineering
Time: 3 hrs. Max. Marks: 100
Note: 1.Answer any FIVE full questions, choosing one full question from each module.
2. Use of steam tables is permitted.
MODULE – I
1 a Classifydifferent sources of energy with suitable examples. (04 Marks)
b Find the enthalpy of 1kg of steam at 12 bar when (i) steam is dry saturated
(ii) steam is 22% wet (iii) superheated to 250ºC. Take the specific heat of
superheated steam as 2.25kJ/kgK.
(06 Marks)
c With the help of T-h diagram, explain the generation of steam at constant
pressure.
(10 Marks)
OR
2 a Write short note on (i) global warming (ii) Ozone depletion (10 Marks)
b State and Explain Zeroth law, first law and second law of thermodynamics. (10 Marks)
MODULE – II
3 a With a neat sketch, explain the working of water tube boiler. (10 Marks)
b Classify Hydraulic pumps and explain the working principle of centrifugalpump
with a neat sketch. (10 Marks)
OR
4 a Classify hydraulic turbines and with a neat sketch explain the working of Francis
turbine.
(10 Marks)
b Explain the functions of (i) Water level indicator (ii) Safety valve (iii) Super
heater (iv) Pressure gauge (v) Feed check valve
(10 Marks)
MODULE – III
5 a With the help of P-V diagram, explain the operation of 4-Stroke Petrol engine (10 Marks)
b Following data are collected from a 4-stroke, single cylinder at full load.
Bore = 200mm, stroke= 280mm, speed = 300 rpm, Indicated mean effective
pressure = 5.6bar, Torque on the brake drum = 250 N-m, fuel consumed =
4.2kg/hour, and calorific value of fuel = 41000 KJ/kg.Determine (i) Brake power
(ii) Mechanical Efficiency (iii) Indicated thermal efficiency (iv) Brake thermal
efficiency
(10 Marks)
OR
6 a Define the following refrigeration terms :
i) Refrigerant ii) Ton of refrigeration iii) COP iv) Relative COP v) Refrigerating
effect
(05 Marks)
b Define refrigeration. State the application of refrigeration (05 Marks)
c With the help of a flow diagram, explain the functioning of Vapor Compression
refrigeration cycle. (10 Marks)
USN
ImportantNote:1.Oncompletingyouranswers,compulsorilydrawdiagonalcrosslinesontheremainingblankpages.
2.Anyrevealingofidentification,appealtoevaluatorand/orequationswrittene.g,38+2=40,willbetreatedasmalpractice.
18ME15/25

18ME15/25
MODULE – IV
7 a Classify and explain various types of Steel (10 Marks)
b With a neat sketch explain the Arc welding method. (10 Marks)
OR
8 a Derive an expression for length of belt in open belt drive. (10 Marks)
b A shaft running at 100 rpm, is to drive a parallel shaft at 150 rpm. The pulley on
the driving shaft is 350 mm in diameter. Find the diameter of the driven pulley.
Calculate the linear velocity of the belt and the velocity ratio.
(10Marks)
MODULE – V
9 a Explain the following machining operations on Lathe machine with suitable
sketches (i) Turning (ii) Facing (iii) Thread cutting (iv) Knurling (10 Marks)
b With a neat sketch explain the working of vertical milling machine (10 Marks)
OR
10 a Explain the advantages and applications of robots in industries. (10Marks)
b Discuss the elements of a CNC system with a neat block diagram. (10 Marks)

18ME15/25
Model Question Paper
First Semester B.E. Degree (CBCS) Examination
Elements of Mechanical Engineering
Time: 3 hrs. Max. Marks: 100
Note: 1.Answer any FIVE full questions, choosing one full question from each module.
2. Use of Thermodynamic data hand book permitted.
MODULE – I
1 a Enumerate the method of extracting energy from wind with a neat sketch (08Marks)
b Illustrate the formation of steam with relevant sketches. (08Marks)
c What are the different states of steam? Explain them in brief. (04 Marks)
OR
2 a Explain Zeroth law of thermodynamics. List the similarities and dissimilarities
between work and heat.
(10 Marks)
b A stationary mass of gas is compressed without friction from an initial stage of
0.3 m3
and 0.105 MPa to a final state of 0.15 m3
, the pressure remaining constant.
There is a transfer of 37.6 kJ of heat from the gas during the process. How much
does the internal energy of the gas change?
(10Marks)
MODULE – II
3 a With a neat sketch, explain the working of Lancashire boiler. (10 Marks)
b Explain the different boiler mountings and accessories. (10 Marks)
OR
4 a Classify Hydraulic turbines and with a neat sketch explain the working of a
typical impulse turbine. (10 Marks)
b Describe the working of a reciprocating pump. (10 Marks)
MODULE – III
5 a With the help of P-V diagram, explain the operation of 4-Stroke Diesel engine (10 Marks)
b The following observations were recorded during a test on single cylinder diesel
engine: Brake Power= 75 kW, Brake thermal efficiency= 35%, Mechanical
efficiency= 90%, calorific value =40000 kJ/kg. Determinei) IP ii) FP iii) fuel
consumed per hour.
(10 Marks)
OR
6 a Explain the ideal properties of refrigerant. (06 Marks)
b With the help of a sketch, explain the functioning of Vapor AbsorptionSystem. (10 Marks)
c List the most commonly used refrigerants. (04 Marks)
MODULE – IV
7 a Classify and explain various types of smart materials (10 Marks)
b With a neat sketch explain TIG welding. (10 Marks)
OR
8 a Derive an expression for length of belt in cross belt drive. (10 Marks)
b What are the advantages and disadvantages of gear drives over belt drives? (10Marks)
USN
ImportantNote:1.Oncompletingyouranswers,compulsorilydrawdiagonalcrosslinesontheremainingblankpages.
2.Anyrevealingofidentification,appealtoevaluatorand/orequationswrittene.g,38+2=40,willbetreatedasmalpractice.
18ME15/25

18ME15/25
MODULE – V
9 a What are the various methods of producing taper turning method? Explain taper
turning by swiveling the compound method. (10Marks)
b Explain the following machining operations on milling machine with suitable
sketches
(i) Plane milling (ii) End milling (iii) Slot milling (iv) Form milling
(10 Marks)
OR
10 a Explain the components of a CNC with a block diagram (10Marks)
b Elaborate the various robot configurations with simple sketches (10 Marks)

(CBCS Scheme)
18PHY12/22USN
Engineering Physics
Time : 3 hrs Max. Marks: 100
Note: 1. Answer FIVE full questions, choosing one full question from each module.
2. Physical constants: Velocity of light c = 3  108
m/s; h = 6.625  10 -34
JS; k = 1.38  10 -23
J/K;
NA = 6.02  10 26
/Kmole; me = 9.1  10-31
kg; e = 1.6  10-19
C
Module – 1
1 a. What are shock waves? Mention the characteristics of shock waves (6 marks)
b. What are damped oscillations? Give the theory of damped oscillations and hence discuss
the case of under damping. (10 marks)
c. A spring undergoes an extension of 5 cm for a load of 50 g. Find its force constant, angular frequency
and frequency of oscillation, if it is set for vertical oscillations with a load of 200 g attached to its
bottom. Ignore the mass of the spring. (4 marks)
OR
2 a. Define simple harmonic motion. Derive the equation for simple harmonic motion using Hooke’s law.
(6 marks)
b. Discuss the theory of forced vibrations and hence obtain the expression for amplitude.
(10 marks)
c. A free particle is executing simple harmonic motion in a straight line with a period of 25 seconds.
5 seconds after it has crossed the equilibrium point, the velocity is found to be 0.7 m/s. Calculate the
displacement at the end of 10 seconds, and also the amplitude of oscillation.
(4 marks)
Module-2
3. a. Explain in brief the factors affecting elastic property of a body. (4 marks)
b. Derive the relation between Y,  and  where the symbols have their usual meaning
(7 marks)
c. What are torsional oscillations? Give the expression for time period of torsional oscillations. Mention the
applications of torsional oscillations (5 marks)
d. A rod of cross sectional area 1cm2
is rigidly planted into the earth vertically. A string which can
withstand a maximum tension of 2kg is tied to the upper end of the rod and pulled horizontally. If the
length of the rod from the ground level is 2m calculate the distance through which its upper end is
displaced just before the string snaps (4 marks)
OR
4. a. State and explain Hookes’ law. Define elastic and plastic limit. (6 marks)
b. Define Poisson’s ratio. Mention its limiting values. Obtain the relation between shear strain, elongation
strain and compression strain. (10 marks)
c. Calculate the twisting couple on a solid cylindrical rod of length 1.5m and radius 80mm when it is
twisted through an angle 0.60
. Rigidity modulus of the material of rod is 93x109
Nm-2
.
(4 marks)

Module-3 18PHY12/22
5. a. Explain the terms gradient of a scalar, divergence and curl of a vector. Derive Gauss
divergence theorem (7 marks)
b. What is displacement current? Obtain the expression for displacement current (6marks)
c. Mention the conditions for three types of polarization of electric vector (3marks)
d. Consider a slab waveguide made of AlGaAs having RI for core and clad 3.6 and 3.55 respectively.
Find how many modes can propagate in this waveguide if d = 5 (4marks)
OR
6. a. Give the four Maxwell’s equations in differential form in vacuum and hence derive the EM wave
equation in terms of electric field using Maxwell’s equations (8marks)
b. Name the three types of attenuation in optical fiber. Obtain the expression for attenuation coefficient
(8marks)
c. A plane EM wave propagating along the x-direction has a wavelength 5mm. The magnitude of the
electric field in y-direction is 38V/m. Find the magnitude of the magnetic field. Also write the time
varying equations for both the fields (4marks)
Module – 4
7. a. Setup 1-dimensional time independent Schrodinger wave equation. Explain Born’s approximation
(8 marks)
b. Mention the three different vibrational modes of CO2 molecule. With a neat energy level diagram explain the
construction and working of CO2 laser (8 marks)
c. An electron is trapped in a 1-D potential well of infinite height and of width of 0.1 nm. Calculate the
energy required to excite it from its ground state to fifth excited state (4 marks)
OR
8. a. With a proper energy level diagram explain the working of Semiconductor laser. Explain the working of
laser range finder (10 marks)
b. State and explain Heisenberg Uncertainty principle. Show that the electron emitted during -decay does
not pre-exist inside the nucleus using uncertainty principle (6 marks)
c. Calculate the wavelength of laser emitted from an extrinsic semiconductor laser if the band gap is 0.02eV.
To which region of EM spectrum does it belong? (4 marks)
Module – 5
9. a. Explain the failures of classical free electron theory. (4 marks)
b. What is Hall Effect? Obtain the expression for Hall voltage in terms of Hall co-efficient
(6 marks).
c. Define Fermi factor. Explain the variation of Fermi factor with temperature.
(6 marks)
d. The charge carrier density of intrinsic germanium is 2.372 x 10-19
/m3
. Assuming electron and hole
mobilities as 3.38 m2
V-1
s-1
and 0.18 m2
V-1
s-1
respectively, calculate the resistivity of intrinsic
germanium at 27o
C. (4 marks)
OR
10. a. Give the assumptions of quantum free electron theory and hence obtain the expression for Fermi energy
at 0 K (8marks)
b. Define internal field in case of solid dielectrics. Derive Clausius-Mossotti equation
(8marks)
c. Calculate the Fermi energy and Fermi velocity of a metal at 0 K whose density is 10500kg/m3
, atomic
weight is 107.9 and has one free electron per atom (4 marks)
*****

of 2
(CBCS Scheme)
18PHY12/22USN
Engineering Physics
Time : 3 hrs Max. Marks: 100
Note: 1. Answer FIVE full questions, choosing ONE full question from each module.
2. Physical constants: Speed of light c = 3  108
m/s; h = 6.625  10 -34
JS; k = 1.38  10 -23
J/K;
NA = 6.02  10 63
/Kmole; me = 9.1  10-31
kg; e = 1.6  10-19
C.
Module – 1
1 a. Starting form Hookes’ law derive the differential equation for SHM. Explain the
Characteristics of SHM. (7 marks)
b. With a neat diagram explain the construction and working of Reddy tube. Mention any four
applications of Shock waves (10 marks)
c. A mass of 4.3gm is attached to a spring of force constant 17N/m. This mass spring system is
executing SHM. Find the frequency of the external force which excites resonance in the
system. Ignore the mass of the spring. (3 marks)
OR
2 a. State and explain laws of conservation of mass, energy and momentum. (6 marks)
b. What are damped oscillations? Derive the expression for decaying amplitude and hence discuss
the case of critical damping (10 marks)
c. A 20 gm oscillator with a natural frequency 10rad/s is vibrating in damping medium. The
damping force is proportional to the velocity of the vibrator. If the damping coefficient is 0.17
how does the oscillation decays? (4 marks)
Module-2
3. a. Explain tensile stress and compressive stress. What are the engineering importances of elastic
materials? (6 marks)
b. Define lateral strain, linear strain and Poisson’s ratio. Obtain the expression for Poisson’s ratio
(10 marks)
c. What are torsional oscillations? Give the expression for time period of torsional oscillations.
Mention the applications of torsional oscillations (5 marks)
d. A wire of length 2m and radius 2mm is fixed to the center of a wheel. A torque of magnitude
0.0395Nm is applied to twist the wire. Find the rigidity modulus of the wire if the angular
twist is 0.038rad (4 marks)
OR
4. a. Define bending moment. Derive the expression for bending moment in terms moment of
inertia. (8 marks)
b. Derive the relation between bulk modulus (K), Young’s modulus (Y) and Poisson’s ratio.
What are the limiting values of Poisson’s ratio? (8 marks)
c. A brass bar of length 1m, area of cross section 0.01m2
is clamped horizontally at one end. A
weight of 1kg is applied at the other end. What is the depression produced (Young’s’ modulus
is 9.78 x 10 10
Nm2
(4 marks)

of 2
Module-3
5. a. Describe the concept of divergence. What is its physical significance? Derive Gauss divergence
theorem (9 marks)
b. With neat diagrams explain different types of optical fiber. Define V number (7marks)
c. A coil of mean radius 8cm and having 100 turns carries current of 10A. Calculate the magnetic
field produced at the center of the coil and at a point on the axis at a distance 4cm from the
center (4marks)
OR
6. a. With the help of Block diagram, explain point to point communication using optical fiber.
Mention the merits and de merits of optical fiber communications (10marks)
b. What is displacement current?. Derive the expression for displacement current (6marks)
c. An optical fiber has core refractive index 1.5 and clad refractive index 3% less than that of core.
Calculate NA, angle of acceptance, and internal critical angle (4marks)
Module – 4
7. a. Staring from Schrodinger’s time independent wave equation, derive the expression for energy eigen
value and eigen function for an electron present in 1-d potential well of infinite depth. (10 marks)
b. What is a laser range finder? Give the qualitative explanation of construction and working of laser
range finder (6 marks)
c. An electron is trapped in a 1-D potential well of infinite height and width of 0.1nm. Calculate the
energy required to excite it from its ground state to fifth excited state (4 marks)
OR
8. a. Explain the terms (a) spontaneous emission, (b) stimulated emission (c) population inversion (d)
active medium and (e) resonance cavity (10 marks)
b. What are the properties of a wave function? Give the qualitative explanation of Max Born’s
interpretation of wave function (6 marks)
c. A laser operating at 632.8nm emits 3.182 x 1016
photons per second. Calculate the output power of
the laser if the input power is 100 watt. Also find the percentage power converted into coherent light
energy (4 marks)
Module – 5
9. a. Give the assumptions of quantum free electron theory. Discuss two success of quantum
free electron theory (8 marks)
b. What are dielectrics? Give the relation between dielectric constant and polarization. Discuss
solid, liquid and gaseous dielectrics with one example for each. (8 marks)
c. Define Fermi temperature. Calculate Fermi temperature for a metal whose Fermi energy is
7eV (4 marks)
OR
10. a. Describe Fermi level in intrinsic semiconductor and hence obtain the expression for
Fermi energy in terms of energy gap of intrinsic semiconductor (8marks)
b. Give a brief account for Fermi-Dirac distribution theory. Obtain the expression for Fermi
energy at 0 K (8marks)
c. The conductivity and Hall coefficient of an n-type semiconductor are 112/m and
1.25 x 10 -3
m3
/C respectively. Calculate the charge carrier concentration and electron mobility
(4 marks)

USN 18EG15/25
First Semester B.E. Degree Examination - 2018
ENGINEERING GRAPHICS
Time: 3 Hours (COMMON TO ALL BRANCHES) Max. Marks: 100
Note: 1. Answer three full questions 2. Use A4 sheets supplied.
3. Draw to actual scale 4. Missing data, if any, may be assumed suitably.
1. A line PQ 85mm long has its end P10mm above HP and 15mm in
front of the VP. The top view and front view of line PQ are 75 mm
and 80mm respectively. Draw the projections. Also determine the
true and apparent inclinations of the line.
25 Marks
OR
1. A square plate of 40mm side rests on HP such that one of the
diagonals is inclined at 300
to HP and 450
to VP. Draw its
projections.
25 Marks
2. A hexagonal prism 25 mm sides of base and 50 mm axis length
rests on HP on one of its edges. Draw the projections of the prism
when the axis is inclined to HP at 450
and appears to be inclined to
VP at 450
.
45 Marks
3. A square pyramid of 25 mm base edge and 50 mm height rests with
its base on HP with all of its base edges equally inclined to VP. It is
cut by a plane perpendicular to VP and inclined to HP at 600
,
passing through the extreme right corner of the base. Draw the
development of the lateral surface of the pyramid.
30 Marks
OR
3. A sphere of diameter 50 mm rests centrally on top of a cube of sides
50 mm. Draw the isometric projections of the combinations of
solids.
30 Marks
* * * * *

USN 18EG15/25
First Semester B.E. Degree Examination - 2018
ENGINEERING GRAPHICS
Time: 3 Hours (COMMON TO ALL BRANCHES) Max. Marks: 100
Note: 1. Answer three full questions 2. Use A4 sheets supplied.
3. Draw to actual scale 4. Missing data, if any, may be assumed suitably.
1. A line AB measuring 70 mm has its end A 15 mm in front of VP
and 20 mm above HP and the other end B is 60 mm in front of VP
and 50 mm above HP. Draw the projections of the line and find the
inclination of the line with both the reference planes of projection.
25 Marks
OR
1. A rectangular lamina of sides 20mm X 30mm rests on HP on one of
its longer edges. The lamina is tilted about the edge on which it rests
till its plane surface is inclined to HP at 450
. The edge on which it
rests is inclined at 300
to VP. Draw the projections of the lamina.
25 Marks
2. A Square pyramid 25 mm sides of base and 60 mm axis length rests
on HP on one its corners of the base such that two base edges
containing the corner on which it rests make equal inclinations with
HP. Draw the projections of the pyramid when the axis is inclined
to HP at 400
and to VP at 300
.
45 Marks
3. A rectangular prism of base 30mm x 20 mm and height 60 mm rests
on HP on its base with the longer base side inclined at 400
to VP. It
is cut by a plane inclined at 450
to HP, perpendicular to VP and
bisects the axis. Draw the development of the lateral surface of the
prism.
30 Marks
OR
3. A triangular prism base side 30mm and length 70 mm is resting on
rectangular face on top of a square slab of side 70mm and 25 mm
thickness .Draw the isometric projections.
30 Marks
* * * * *

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