Pi gate-2018-p (gate2016.info)

GATE 2018 General Aptitude (GA) Set-2
GA 1/3
Q. 1 – Q. 5 carry one mark each.
Q.1 “The dress _________ her so well that they all immediately _________ her on her
appearance.”
The words that best fill the blanks in the above sentence are
(A) complemented, complemented (B) complimented, complemented
(C) complimented, complimented (D) complemented, complimented
Q.2 “The judge’s standing in the legal community, though shaken by false allegations of
wrongdoing, remained _________.”
The word that best fills the blank in the above sentence is
(A) undiminished (B) damaged (C) illegal (D) uncertain
Q.3 Find the missing group of letters in the following series:
BC, FGH, LMNO, _____
(A) UVWXY (B) TUVWX (C) STUVW (D) RSTUV
Q.4 The perimeters of a circle, a square and an equilateral triangle are equal. Which one of the
following statements is true?
(A) The circle has the largest area.
(B) The square has the largest area.
(C) The equilateral triangle has the largest area.
(D) All the three shapes have the same area.
Q.5
The value of the expression
1
1+log𝑢 𝑣𝑤
+
1
1+log𝑣 𝑤𝑢
+
1
1+log𝑤 𝑢𝑣
is _________.
(A) -1 (B) 0 (C) 1 (D) 3
Q. 6 – Q. 10 carry two marks each.
Q.6 Forty students watched films A, B and C over a week. Each student watched either only
one film or all three. Thirteen students watched film A, sixteen students watched film B
and nineteen students watched film C. How many students watched all three films?
(A) 0 (B) 2 (C) 4 (D) 8

GA 2/3
Q.7 A wire would enclose an area of 1936 m2
, if it is bent into a square. The wire is cut into
two pieces. The longer piece is thrice as long as the shorter piece. The long and the short
pieces are bent into a square and a circle, respectively. Which of the following choices is
closest to the sum of the areas enclosed by the two pieces in square meters?
(A) 1096 (B) 1111 (C) 1243 (D) 2486
Q.8 A contract is to be completed in 52 days and 125 identical robots were employed, each
operational for 7 hours a day. After 39 days, five-seventh of the work was completed. How
many additional robots would be required to complete the work on time, if each robot is
now operational for 8 hours a day?
(A) 50 (B) 89 (C) 146 (D) 175
Q.9 A house has a number which needs to be identified. The following three statements are
given that can help in identifying the house number.
i. If the house number is a multiple of 3, then it is a number from 50 to 59.
ii. If the house number is NOT a multiple of 4, then it is a number from 60 to 69.
iii. If the house number is NOT a multiple of 6, then it is a number from 70 to 79.
What is the house number?
(A) 54 (B) 65 (C) 66 (D) 76

GA 3/3
Q.10 An unbiased coin is tossed six times in a row and four different such trials are conducted.
One trial implies six tosses of the coin. If H stands for head and T stands for tail, the
following are the observations from the four trials:
(1) HTHTHT (2) TTHHHT (3) HTTHHT (4) HHHT__ __.
Which statement describing the last two coin tosses of the fourth trial has the highest
probability of being correct?
(A) Two T will occur.
(B) One H and one T will occur.
(C) Two H will occur.
(D) One H will be followed by one T.
END OF THE QUESTION PAPER

GATE 2018 Production and Industrial Engineering
PI 1/10
Q. 1 – Q. 25 carry one mark each.
Q.1 Vector triple product ( )
 
a b c of three vectors a, b and c is given by
(A) ( ) ( )
 

a c b a b c (B) ( ) ( )
 

b c a a c b
(C) ( ) ( )
 

a b c a c b (D) ( ) ( )
 

b c a a b c
Q.2 A real-valued function y of real variable x is such that 5 .
y x
 At 0,
x  the function is
(A) discontinuous but differentiable (B) both continuous and differentiable
(C) discontinuous and not differentiable (D) continuous but not differentiable
Q.3 Considering the coordinate system shown in the figure, a force of magnitude 10 kN has
x-component of 6 kN. Possible y-component (s) of the force is/are
x
y
o
(A) +8 kN only (B) +5 kN only
(C) +8 kN and 8 kN (D) +5 kN and 5 kN
Q.4 When austenite decomposes upon cooling into two phases— ferrite and cementite, the
reaction is called
(A) Eutectic (B) Eutectoid (C) Peritectic (D) Peritectoid
Q.5 Match the geometric tolerances with their correct symbols:
P. Flatness 1.
Q. Perpendicularity 2.
R. Concentricity 3.
S. Roundness (Circularity) 4.
(A) P – 1, Q – 3, R – 4, S – 2 (B) P – 3, Q – 1, R – 4, S – 2
(C) P – 3, Q – 1, R – 2, S – 4 (D) P – 3, Q – 2, R – 1, S – 4

PI 2/10
Q.6 Which one of the following instruments makes use of the principle of interference of light?
(A) Optical flat (B) Auto-collimator
(C) Optical projector (D) Coordinate measuring machine
Q.7 In ASME process chart, the symbol  represents
(A) operation (B) inspection (C) delay (D) transport
Q.8 Which one of the following is the most appropriate control chart for measuring the variability
of individual readings within a sample?
(A) -chart
X (B) R-chart (C) p-chart (D) c-chart
Q.9 The machines and auxiliary facilities are located according to processing sequence of the
product (produced in very large quantities) in
(A) Process Layout (B) Fixed Position Layout
(C) Product Layout (D) Cellular Layout
Q.10 Which one of the following defects is NOT associated with the casting process?
(A) Hot tear (B) Porosity (C) Blister (D) Central burst
Q.11 In an oxy-acetylene gas welding process, oxygen and acetylene are mixed in a ratio of 1.5:1
(by volume). The flame is
(A) neutral (B) carburizing (C) reducing (D) oxidizing
Q.12 Each of three firms P, Q and R manufactures 100 lakhs components. The number of defective
components produced by P, Q and R are 30, 42 and 47, respectively. The firm(s) in
conformance with Six Sigma standard is/are
(A) only P (B) P and Q (C) P, Q and R (D) Q and R
Q.13 To make holes of 0.5 mm diameter and 30 mm depth in a mild steel component, the most
suitable process is
(A) chemical machining (B) electrochemical machining
(C) abrasive jet machining (D) plasma arc machining
Q.14 Which one of the following processes is NOT used for producing powders?
(A) Atomization (B) Ball milling (C) Sintering (D) Electrolysis

PI 3/10
Q.15 The process in which molten thermoplastic is forced between rolls to produce thin sheets is
called
(A) blow moulding (B) compression moulding
(C) calendering (D) extrusion
Q.16 The diagonal elements of a 3-by-3 matrix are 10, 5 and 0, respectively. If two of its
eigenvalues are 15 each, the third eigenvalue is _______
Q.17 Weights (in kg) of six products are 3, 7, 6, 2, 3 and 4. The median weight
(in kg, up to one decimal place) is _______
Q.18 The probabilities of occurrence of events F and G are P(F) = 0.3 and P(G) = 0.4, respectively.
The probability that both events occur simultaneously is P(FG) = 0.2. The probability of
occurrence of at least one event P(FG) is _______
Q.19 A flywheel in the form of a solid circular disc of radius 100 mm and uniform thickness has
a mass of 10 kg. If it is rotating at a uniform angular velocity of 20 rad/s, the kinetic energy
(in J) of the flywheel is _______
Q.20 A cylindrical wooden block of length 50 cm is floating in water in such a way that its axis is
vertical. The densities of wood and water are 800 kg/m3
and 1000 kg/m3
, respectively. The
submerged depth, i.e., depth of immersion (in cm) of the cylinder is _______
Q.21 A machine consists of three components P, Q and R connected serially. The reliabilities of
P, Q and R are 0.97, 0.86 and 0.93, respectively. To increase the reliability of the machine,
two additional stand-by units of Q are attached. The overall reliability (up to two decimal
places) of the machine is _______
Q.22 The mean time between failures of a machine is 400 hour. If the availability of the machine
is 80%, the mean time to repair (in hour) is _______

PI 4/10
Q.23 Processing times on a single machine for 3 jobs are given below. All the jobs are available
at time t = 0.
Job 1 2 3
Processing time (minute) 15 3 6
The mean flow time (in minute) as per the shortest processing time (SPT) sequence
is _______
Q.24 In a two-pass wire drawing process, there is a 40% reduction in wire cross-sectional area in
1st
pass and further 30% reduction in 2nd
pass. The overall reduction (in percentage)
is ______
Q.25 A double-start thread with a pitch of 2 mm is to be cut using a lathe machine. The pitch of
the leadscrew of the lathe is 6 mm. The job rotates at 60 revolution per minute (RPM). The
RPM of the leadscrew is ______

PI 5/10
Q. 26 – Q. 55 carry two marks each.
Q.26 Consider the analytic function 2 2
( ) 2
f z x y i xy
   of the complex variable ,
z x iy
 
where 1.
i   The derivative ( )
f z
 is
(A) 2 2
x i y
 (B) 2 2
x iy
 (C) x iy
 (D) 2 2
x i y

Q.27
In order to evaluate the integral
1
0
e d
x
x
 with Simpson’s 1/3rd
rule, values of the function
ex
are used at x 0.0, 0.5 and 1.0. The absolute value of the error of numerical integration is
(A) 0.000171 (B) 0.000440 (C) 0.000579 (D) 0.002718
Q.28 A rigid link PQ of length 1.0 m is pinned at P. It rotates about P in a vertical plane with a
uniform angular acceleration of 1.0 rad/s2
. At an instant when the angular velocity of the link
is 1.0 rad/s, the magnitude of total acceleration (in m/s2
) of point Q relative to point P is
(A) 1.41 (B) 1.73 (C) 2 (D) 2.83
Q.29 In a shaft-hole system, the dimensions with tolerances (in mm) are as follows:
Shaft: 20 x
x
 
 Hole:
0.03
20 y
 

where both x and y are positive real numbers. Which one of the following will provide an
interference fit?
(A) x = 0.05, y = 0.040 (B) x = 0.04, y = 0.035
(C) x = 0.04, y = 0.032 (D) x = 0.02, y = 0.035
Q.30 A machine is procured at a price of Rs. 47000 with a 2-year warranty. After two years, the
annual maintenance cost (AMC) in Rs. is given by the following formula:
AMC =  
2 2000, for 2
i i
   ,
where i is the number of years elapsed since the machine was purchased. Neglect the scrap
value of the machine, inflation, interest, etc. For minimizing the average cost, the machine
should be replaced at the end of the year
(A) 2 (B) 4 (C) 7 (D) 10
Q.31 In a service centre, cars arrive according to Poisson distribution with a mean of 2 cars per
hour. The time for servicing a car is exponential with a mean of 15 minutes. The expected
waiting time (in minute) in the queue is
(A) 10 (B) 15 (C) 25 (D) 30

PI 6/10
Q.32 Actual and forecasted demands of a product are as follows:
Period 1 2 3 4 5
Actual demand 180 170 165 170 200
Forecasted demand 190 190 190 190 190
The forecast error measured in terms of mean absolute deviation (MAD) and mean absolute
percentage error (MAPE), respectively, are
(A) 13 and 7.84% (B) 13 and 9.85% (C) 17 and 7.84% (D) 17 and 9.85%
Q.33 In a mass production firm, measurements are carried out on 10000 pairs of shaft and hole.
The mean diameters of the shaft and the hole are 37.53 mm and 37.59 mm, respectively. The
corresponding standard deviations are 0.03 mm and 0.04 mm. The mean clearance and its
standard deviation (both in mm), respectively, are
(A) 0.06 and 0.07 (B) 0.06 and 0.06 (C) 0.06 and 0.05 (D) 0.07 and 0.01
Q.34 A pressure die casting set-up was tested by injecting water (density 1000 kg/m3
) at a pressure
of 200 bar. Mould-filling time was found to be 0.05 s. Afterwards, the actual casting is made
by injecting the liquid metal (density 2000 kg/m3
) at an injection pressure of 400 bar. Neglect
all losses (friction, viscous-effect, etc.). The approximate mould-filling time (in s) is
(A) 0.05 (B) 0.075 (C) 0.1 (D) 0.2
Q.35 The value of the surface integral (9 2 ) d
S
x y z S

 
 i j k n over the surface S of the sphere
2 2 2
9,
x y z
   where n is the unit outward normal to the surface element d ,
S is ______
Q.36 Consider the differential equation
2
2
d
2 8 0
d
y
y
t
 
with initial conditions:
at 0,
t  0
y  and
d
10.
d
y
t

The value of y (up to two decimal places) at 1
t  is ______
Q.37 One kg of air (that can be considered a calorically perfect gas with characteristic gas constant
R = 287 J/kg-K and specific heat ratio 1.4
  ) undergoes a constant-volume process from
an initial static pressure of 1 bar to a final static pressure of 4 bar. The increase in entropy
(in J/kg-K) of air is ______

PI 7/10
Q.38 If 2 2
2( )
u x y
  and v axy
  represent the x- and y-components of the two-dimensional
velocity field of an incompressible flow, the value of the constant a is ______
Q.39 A spherical pressure vessel (made of mild steel) of internal diameter 500 mm and thickness
10 mm is subjected to an internal gauge pressure of 4000 kPa. If the yield stress of mild steel
is 200 MPa, the factor of safety (up to one decimal place) is ______
Q.40 A square cross-section wooden column of length 3140 mm is pinned at both ends. For the
wood, Young’s modulus of elasticity is 12 GPa and allowable compressive stress is 12 MPa.
The column needs to support an axial compressive load of 200 kN. Using a factor of safety
of 2.0 in the computation of Euler’s buckling load, the minimum cross-sectional area
(in mm2
) of the column is ______
Q.41 Length, width and thickness of a plate are 400 mm, 400 mm and 30 mm, respectively. For
the material of the plate, Young’s modulus of elasticity is 70 GPa, yield stress is 80 MPa and
Poisson’s ratio is 0.33. When the plate is subjected to a longitudinal tensile stress of 70 MPa,
the increase in the volume (in mm3
) of the plate is ______
Q.42 In a V-thread, a wire is fitted such that it makes contact with the flank of the thread on the
pitch line as shown in the figure. If the pitch p of the thread is 3 mm and the included angle
is 60, the diameter (in mm, up to one decimal place) of the wire is ______
0.25p
O
Pitch line
60°

PI 8/10
Q.43 A project consists of three activities P, Q and R. The durations of activities follow Beta
distribution. The predecessors and durations of activities are as per the following table:
Activity Predecessors Optimistic time
(month)
Most likely time
(month)
Pessimistic time
(month)
P — 2 3 10
Q P 3 5 13
R Q 3 4 5
The expected project completion time (in month) is ______
Q.44 A company has two manufacturing plants (C1 and C2) and two distribution centres (D1 and
D2). The capacities of C1 and C2 are 100 and 200 units, respectively. The demand for D1 and
D2 are 190 and 110 units, respectively. The costs per unit (in Rs.) of transportation at different
routes are as per the following matrix:
D1 D2
C1 22 21
C2 20 27
The minimum total cost (in Rs.) of transportation is ______
Q.45 The annual demand of an item is 19845 units and the production rate is 100 units per day.
The per-unit production cost (excluding setup cost) is Rs. 50, the per-unit holding cost is
Rs. 10 per year and setup cost is Rs. 520 per setup. To minimize the total annual cost, the
optimum quantity to be produced per setup is ______
Q.46 A production line operates 7 hours a day in a 5-day week. The processing times for various
job elements are as follows:
Job element p q r s t
Processing time (s) 5 10 12 3 15
If the line is designed for an output of 8400 units per week, the theoretical minimum number
of work stations required is ______
Q.47 In a work sampling study of a worker, the information available are as follows: total time of
study: 30 hour, number of items produced: 320, total number of observations: 1000, number
of observations when worker is found working: 850 and average performance rating: 105%.
Company policy is to give allowance of 10% of total time on the job. The standard time
(in minute per item, up to one decimal place) for manufacturing the item is ______

PI 9/10
Q.48 The breakeven point of a manufacturing company is 50000 units. The fixed cost is
Rs. 200000 and the variable cost per unit is Rs. 20. The selling price per unit (in Rs.) of the
product at this breakeven point is ______
Q.49 A 10 mm thick plate is rolled to 7 mm thickness in a rolling mill using 1000 mm diameter
rigid rolls. The neutral point is located at an angle of 0.3 times the bite angle from the exit.
The thickness (in mm, up to two decimal places) of the plate at the neutral point is ______
Q.50 A cylindrical workpiece is turned at a feed of 0.1 mm/rev with a perfectly sharp tool. In ASA
system, the side and end cutting edge angles are 15° and 5°, respectively, as shown in the
figure. The peak-to-valley roughness (in µm, up to one decimal place) of the machined
surface is ______
5o
15o
Feed = 0.1 mm/rev
Q.51 The worktable in a CNC machine is driven by a leadscrew with a pitch of 2 mm. The
leadscrew is directly coupled to a stepper motor of step angle 1.8°. The number of pulses
required to move the worktable by 50 mm is ______
Q.52 During orthogonal machining of a job at a cutting speed of 90 m/min with a tool of 10° rake
angle, the cutting force and thrust force are 750 N and 390 N, respectively. Assume a shear
angle of 35°. The power (in W) expended for shearing along the shear plane is ______
Q.53 In an electrochemical machining of aluminium with plane parallel electrodes, the current
density is 70 A/cm2
. Cross-sectional area of each electrode is 3 cm2
. The current efficiency
(i.e., the fraction of current used for dissolution of metal) is 80%. Gram atomic weight,
valency and density of aluminium are 27 gram, 3 and 2700 kg/m3
, respectively. Take
Faraday’s constant as 96500 Coulomb. The volumetric material removal rate (in mm3
/min)
is ______
Q.54 Two metallic sheets are spot welded by passing a current of 8000 A for 0.2 s. Assume that a
cylindrical nugget of 8 mm diameter and 3 mm depth is formed. The density of the nugget
is 7500 kg/m3
, effective resistance of the total system is 222 micro-Ohm and heat required
to produce 1.0 gram of nugget is 1400 J. The percentage of heat actually utilized in producing
the nugget is ______

PI 10/10
Q.55 In a planar 2-degree-of-freedom robot, Link 1 of 30 cm length is connected to base by a
revolute joint and Link 2 of length 20 cm is connected to Link 1 with a revolute joint as
shown in the figure. The work-envelope area (in cm2
), covered by point P, is ______
Joint 1
Joint 2
Link 2
L
i
n
k
1
P
Base
END OF THE QUESTION PAPER

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