Dc circuits MCQ's
- 1. Roll No:.XXXXXXXXXXXXXXX. Section: K1515 , K1516 & K1531. UNIT-1 MCQ For Practice purpose Subject code: ECE131 Choose the correct answer for the following questions: 1. ........is the smallest particle of an element. (A) Atom (B) Matter (C) Compound (D) Molecule 2. .............is the chemical combination of two or more atoms. (A) Atom (B) element (C) Compound (D) Molecule 3. The chemical combination of two or more elements is called as....... (A) Atom (B) element (C) Compound (D) Molecule 4. Physical combination of elements and compounds are called as...... (A) Atom (B) proton (C) Mixture (D) Molecule 5. Nucleus has......... (A) Protons, Neurons (B) Protons and Neutrons (C) Neurons and nucleons (D) electrons and protons 6. Number of electrons in K,L,M,N,O,P,Q shell are...... (A) 2,8,18,32,18,12,2 (B) 2,12,18,32,18,12,2 (C) 2,12,18,36,18,12,2 (D) 2,10,18,32,18,12,2 7. Atomic number is given by.........in nucleus. (A) Number of electrons (B) Number of Neutrons (C) Number of Protons (D) Sum of protons and neutrons 8. Atomic weight is given by.........in nucleus. (A) Number of electrons (B) Number of Neutrons (C) Number of Protons (D) Sum of protons and neutrons 9. Flow of electrons is (A) Protons (B) Charge (C) Current (D) Voltage 10. Current I=....... (A) t/q (B) qt (C) q/t (D) None 11. 1 columb= charge of......... (A) 6.24 ∗ 1018 electrons (B) 6.28 ∗ 10−18 electrons (C) 6.24 ∗ 1014 electrons (D) None 12. ...................is the force that moves electrons in a circuit. (A) Voltage (B) Potential difference (C) Electromotive force (D) All the above 13. Ability of source to perform electrical work (A) Potential (B) Impedance (C) Energy (D) None 14. The opposition to the flow of electrons is called....... (A) Resistance (B) Conductance (C) neglectance (D) recklessness 15. Ability to pass electrons or the reciprocal of resistance is....... (A) Inductance (B) Resistance (C) Conductance (D) Persistence 16. Conductance is measured in........ (A) Ohms (B) Simens (C) Joules (D) Watt 17. The amount of........flow through the body that determines the severity of a shock. (A) Voltage (B) Current (C) Power (D) None 18. Factors which influence electric shock are......... (A) Intensity and frequency of current (B) Length of time current passes through body (C) current path through body (D) All the above
- 2. 19. Insulators are materials with (A) High resistance (B) Low conductance (C) Both a and b (D) High conductance 20. An Inductor is a device that store energy in ........... field. (A) Electric (B) Magnetic (C) Electromagnetic (D) Biotec 21. A capacitor is a device that store energy in ........... field. (A) Electric (B) Magnetic (C) Electromagnetic (D) ECE 22. Capacitance is affected by: (A) Area of the capacitor plates (B) Distance between the plates (C) temperature and type of dielectric material (D) All the above 23. What is the standard unit of Inductance? (A) milli Henry (B) Henry (C) Farad (D) µ Farad 24. Rate of doing work is (A) K1515 (B) Capacity (C) Energy (D) Power 25. Capacity to do work is called as (A) K1516 (B) Capacity (C) Energy (D) Power 26. What are the units of power and energy? (A) Watt and VAR (B) VAR and Watt (C) Joule and Watt (D) Watt and Joule 27. In Ohm’s law the following statement is valid at constant temperature. (A) Voltage is directly proportional to current (B) Voltage is directly proportional to Resistance (C) Current is directly proportional to Voltage (D) Both a and c 28. Kirchhoffs current law is applicable to only (A) Closed loops in a network(B) Electronic circuits (C) Junctions in a network (D) Electric circuits 29. Kirchhoff’s laws are applicable to......... (A) AC circuits (B) DC circuits (C) Both a and b (D) None 30. Kirchhoffs voltage law is concerned with (A) IR drops (B) battery e.m.fs. (C) junction voltages (D) both (a) and (b) 31. According to KVL, the algebraic sum of all IR drops and e.m.f.s in any closed loop of a network is always (A) zero (B) positive (C) negative (D) determined by battery e.m.fs. 32. The algebraic sign or polarity of an IR drop is primarily dependent upon the (A) amount of current flowing through it (B) value of R (C) direction of current flow (D) battery connection. 33. Maxwell’s loop current method of solving electrical networks (A) uses branch currents (B) utilizes Kirchhoff’s voltage law (C) is confined to single-loop circuits (D) is a network reduction method. 34. The sign or polarity of the battery e.m.f. is........... of the direction of the current through that branch. (A) independent (B) dependent (C) either a or b (D) None 35. The sign or polarity of voltage drop across a resistor ...........on the direction of current through that resistor but is .............of the polarity of any other source of e.m.f. in the circuit under consideration. (A) depends, dependent (B) depends, independent (C) independent, dependent (D) independent, indepen- dent 36. Nodal analysis or Nodal voltage method=.......... (A) KVL+ohm’s law (B) KCL+ohm’s law (C) Both a and b (D) None 37. Mesh analysis or maxwell’s loop analysis=......... (A) KVL+ohm’s law (B) KCL+ohm’s law (C) Both a and b (D) None
- 3. 38. Ammeter is used to measure......... (A) Power (B) Energy (C) Voltage (D) Current 39. Voltmeter is used to measure......... (A) Power (B) K1531 (C) Voltage (D) Current 40. Wattmeter is used to measure......... (A) Power (B) Energy (C) Voltage (D) Govind 41. An ideal voltage source should have internal resistance........... (A) zero (B) Infinity (C) either a or b (D) None 42. An ideal voltmeter will have internal resistance............... (A) zero (B) Infinity (C) either a or b (D) None 43. An ideal current source should have internal resistance........... (A) zero (B) Infinity (C) either a or b (D) None 44. An ideal ammeter should have internal resistance............ (A) zero (B) Infinity (C) either a or b (D) None 45. Energy stored in a capacitor is........... (A) 1 2 CV 2 (B) 1 2 LI2 (C) Both a and b (D) None 46. Energy stored in an inductor is........... (A) 1 2 CV 2 (B) 1 2 LI2 (C) Both a and b (D) None 47. 1watt=............. (A) columb/sec (B) kolumbs/sec (C) joule/sec (D) sec/columb 48. A variable resistor used to control voltage is........ (A) Rheostat (B) Potentiometer (C) Both a and b (D) None 49. A variable resistor used to control current is........ (A) Rheostat (B) Potentiometer (C) Both a and b (D) None 50. Combination of two or more cells is..... (A) Battery (B) Current (C) Power (D) I don’t know 51. ............of resistor is the amount that its resistance can vary and still be acceptable. (A) Admittance (B) Conductance (C) Resistance (D) Tolerance 52. Tolerance of resistor will be satisfactory up to which percent? (A) 10 (B) 20 (C) 30 (D) 40 53. VOM stands for....... (A) Volt-Ohm-milliammeter (B) Variance of memory (C) Voice of Men (D) Voice of WoWmen 54. Maximum value of meter scale is called—— (A) Full scale value (B) Half scale value (C) Quarter scale value (D) Kingfisher scale value 55. What is the time constat of an RL circuit? (A) R/L (B) L/R (C) RL (D) (R/L)*t 56. What is the time constat of an RC circuit? (A) R/C (B) C/R (C) RC (D) (RC)*t 57. How many time constants are required to fully build up a magnetic field(electric field) for an inductor(Capacitor)? (A) 10 (B) 5 (C) 2.5 (D) 0 58. 1G Ω is equals to (A) 10−9 Ω (B) 109 Ω (C) 1010 Ω (D) 1012 Ω
- 4. 59. 1n Farad is equals to (A) 10−9 Farad (B) 109 Farad (C) 1010 Farad (D) 1012 Farad 60. 1T (Tera)Farad is equals to (A) 10−9 Farad (B) 109 Farad (C) 1010 Farad (D) 1012 Farad 61. Capacitor or inductor is a.............elment (A) Complex (B) Real (C) Reactive (D) I don’t know 62. A resistor has the colours Brown, Black and Red in serial order. What is value of the resistance by neglecting tolerance colour? (A) 100 Ω (B) 10 Ω (C) 1000 Ω (D) None 63. A 120 Ω resistor having 10 percent tolerance. What is its minimum and maximum value of resistance you will see practically. (A) 120 ± 12Ω (B) 120 ± 10Ω (C) 100 ± 12Ω (D) 100 ± 10Ω 64. What is the equivalent value of resistance when 4 resistors of 8Ω connected in series? (A) 32 Ω (B) 12 Ω (C) 2 Ω (D) None 65. What is the equivalent value of resistance when 4 resistors of 8Ω connected in parallel? (A) 32 Ω (B) 12 Ω (C) 2 Ω (D) None 66. What is the equivalent value of resistance when parallel combination of two 10Ω resistances are in series with 5Ω resis- tance? (A) 5 Ω (B) 10 Ω (C) 15 Ω (D) 20 Ω 67. What is the equivalent value of capacitance when 6F capacitance is connected in series with 3F? (A) 0.5F (B) 2F (C) 9F (D) .9F 68. What is the equivalent value of capacitance when 6F capacitance is connected in parallel with 3F? (A) 0.5F (B) 2F (C) 9F (D) .9F 69. What is the equivalent value of capacitance when parallel combination of two 3F capacitances are in series with 3F capacitance? (A) 0.5F (B) 2F (C) 9F (D) .9F 70. What is the equivalent value of resistance between A and B terminals in above circuit1? (A) 1.5 Ω (B) 5 6 Ω (C) 4 3 Ω (D) 6 5 Ω 71. What is the equivalent value of resistance between C and D terminals in above circuit1? (A) 1.5 Ω (B) 5 6 Ω (C) 4 3 Ω (D) 6 5 Ω 72. What is the equivalent value of resistance between A and C terminals in above circuit1? (A) 1.5 Ω (B) 5 6 Ω (C) 4 3 Ω (D) 6 5 Ω 73. What is the equivalent value of resistance between A and B terminals in above circuit2? (A) 3 Ω (B) 4.5 Ω (C) 5.2 Ω (D) 6 Ω 74. What is the voltage between terminals A and B in above circuit3? (A) 25 V (B) 15 V (C) -15 V (D) None
- 5. 75. What is the voltage between terminals A and B in below circuit4? (A) 24 V (B) -24 V (C) I don’t know (D) 42 V 76. What is the voltage between terminals A and B in above circuit5? (A) 30 V (B) -30 V (C) 5 V (D) -5 V 77. What is the voltage between terminals C and D in above circuit5? (A) 30 V (B) -30 V (C) 5 V (D) -5 V 78. What is the voltage between terminals A and B in below circuit6? (A) 10 V (B) -10 V (C) 6 V (D) -6 V 79. What is the total power consumed in below circuit6? (A) 10 W (B) 20 W (C) 40 W (D) None 80. What is the value of current passing through 100 V voltage source in above circuit7? (A) 2 A (B) 6 A (C) -2 A (D) 8 A 81. What is the total power consumed in above circuit7? (A) 320 W (B) 720 W (C) 840 W (D) None 82. What is the value of Voltage across current source in below circuit8? (A) 20 V (B) 40 V (C) 60 V (D) None 83. What is the value of Power across current source in below circuit8? (A) 2 W (B) 20 W (C) 200 W (D) 120 W 84. Calculate I in above circuit9. (A) 10 A (B) 1 A (C) 11 A (D) None 85. Time constant of an RC circuit is 5 sec. How much time will be required for the capacitor to fully charge(Approximate)? (A) 20 sec (B) 25 sec (C) 30 sec (D) 50 sec 86. What is the use of Function generator?
- 6. (a) To generate sinusoidal signal (b) To generate square signal (c) To generate triangular wave form (d) All the above 87. What is the use of Cathode Ray Oscilloscope (CRO)? (a) To verify Diode characteristics (b) To see the output and input sinusoidal signals (c) To Verify resistance characterstics (d) To test a capacitor whether it is working or not (e) All the above 88. What is the voltage across resistor R1 in the following circuit10? (A) R2 R1+R2 (B) V R2 R1+R2 (C) V R1 R1+R2 (D) none 89. What is the current across resistor R2 in the following circuit11? (A) R2 R1+R2 (B) IR2 R1+R2 (C) IR2 R1+R2 (D) IR1 R1+R2 90. Circuit10 is the..........division circuit and circuit 11 is the.........division circuit (A) Voltage, current (B) Voltage, Voltage (C) Current, Voltage (D) None 91. What is the value of current I and I2 in the above circuit12? (A) 17A, 10A (B) 17A, 2A (C) 15A, 1A (D) 17A, 5A 92. Calculate the value of current I in below circuit 13? (A) 5 A (B) 10 A (C) 15 A (D) 25 A 93. Calculate the value of current I1 and I2 in the above circuit14. (A) 20A, 10A (B) 20A, 5A (C) 20A,15A (D) 25A, 15A 94. Determine the value of Unkonown resistance R in the below circuit15. (A) 10 Ω (B) 25 Ω (C) 125 Ω (D) 100 Ω
- 7. 95. Calculate the value of current I in the above circuit16. (A) 20 A (B) 8 A (C) 14 A (D) 6 A 96. What is the value of I1 and I2 in the below circuit17. (A) 4A, -4A (B) 2A, 2A (C) 4A, 4A (D) 2A, -2A 97. What is the total resistance in the below circuit17. (A) 20 Ω (B) 40 Ω (C) 35 Ω (D) 53 Ω 98. What is the voltages between terminals AB and AC in above circuit18? (A) 3V, 6V (B) 6V, 15V (C) 6V, 9V (D) None 99. Three parallel connected resistors when connected across a d.c. voltage source dissipate a total power of 72 W. The total current drawn is 6 A, the current flowing through the first resistor is 3 A and the second and third resistors have equal value. What are the resistances of the three resistors? (A) 4,8,8 (B) 4,12,12 (C) 4,4,4 (D) None 100. What is the voltage between the terminals A and B in the following circuit19? (A) 4 V (B) -4 V (C) 18 V (D) -18 V Karri Guru Govind