100 MCQs for JK SSB JE (Electrical Engineering) covering Power Systems, Electronics, Control Systems, and more*:

Here are *100 MCQs* *JK SSB JE (Electrical Engineering)* covering *Power Systems, Electronics, Control Systems, and more*:

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Here are *100 multiple-choice questions (MCQs)* with answers for *JK SSB JE (Electrical Engineering)* exam preparation:

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### *Basic Electrical Engineering*
1. *The SI unit of electric current is:*
a) Volt
b) Ampere ✅
c) Ohm
d) Watt

2. *Ohm’s Law is given by:*
a) V = IR ✅
b) P = VI
c) V = I/R
d) R = ρL/A

3. *The resistance of a conductor depends on:*
a) Length ✅
b) Temperature ✅
c) Material ✅
d) All of the above ✅

4. *Kirchhoff’s Current Law (KCL) states that:*
a) Sum of currents entering a node = Sum of currents leaving ✅
b) Sum of voltages in a loop is zero
c) Power is conserved
d) None of these

5. *The power factor of a purely resistive circuit is:*
a) 0
b) 1 ✅
c) 0.5
d) Lagging

6. *The unit of inductance is:*
a) Farad
b) Ohm
c) Henry ✅
d) Tesla

7. *In a capacitive AC circuit, the current:*
a) Lags voltage by 90°
b) Leads voltage by 90° ✅
c) Is in phase with voltage
d) None of these

8. *The equivalent resistance of two 10Ω resistors in parallel is:*
a) 20Ω
b) 5Ω ✅
c) 10Ω
d) 15Ω

9. *The time constant of an RC circuit is given by:*
a) RC ✅
b) L/R
c) R/L
d) 1/RC

10. *The unit of electrical energy is:*
a) Watt
b) Joule ✅
c) Volt-Ampere
d) Ohm

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### *Electrical Machines*
11. *A transformer works on the principle of:*
a) Self-induction
b) Mutual induction ✅
c) Electrostatic induction
d) None of these

12. *The no-load current of a transformer is:*
a) Purely resistive
b) Purely inductive
c) Mostly magnetizing ✅
d) Zero

13. *The slip of an induction motor at standstill is:*
a) 0
b) 1 ✅
c) 0.5
d) Infinity

14. *The speed of a synchronous motor depends on:*
a) Load
b) Supply frequency ✅
c) Armature current
d) None of these

15. *DC motors are preferred for applications requiring:*
a) High starting torque ✅
b) Constant speed
c) Low maintenance
d) None of these

16. *The commutator in a DC machine is used for:*
a) AC to DC conversion ✅
b) DC to AC conversion
c) Voltage regulation
d) Speed control

17. *The efficiency of a transformer is maximum when:*
a) Copper loss = Iron loss ✅
b) Copper loss > Iron loss
c) Copper loss < Iron loss
d) None of these

18. *The rotor of a 3-phase induction motor is:*
a) Wound type
b) Squirrel cage type
c) Both (a) & (b) ✅
d) None of these

19. *A stepper motor is used for:*
a) Continuous rotation
b) Precise position control ✅
c) High-speed applications
d) None of these

20. *The starting torque of a capacitor-start induction motor is:*
a) Low
b) High ✅
c) Zero
d) None of these

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### *Power Systems*
21. *The frequency of power supply in India is:*
a) 50 Hz ✅
b) 60 Hz
c) 220 Hz
d) 100 Hz

22. *The main advantage of high transmission voltage is:*
a) Reduced losses ✅
b) Increased current
c) Higher power factor
d) None of these

23. *The unit of reactive power is:*
a) Watt
b) VA
c) VAR ✅
d) kWh

24. *A fuse is used for:*
a) Overcurrent protection ✅
b) Overvoltage protection
c) Short-circuit protection
d) Both (a) & (c) ✅

25. *The grounding wire is usually made of:*
a) Copper ✅
b) Aluminum
c) Iron
d) Silver

26. *The main purpose of a circuit breaker is to:*
a) Interrupt fault currents ✅
b) Regulate voltage
c) Improve power factor
d) None of these

27. *Skin effect occurs in:*
a) DC transmission
b) AC transmission ✅
c) Both AC & DC
d) None of these

28. *The power factor of an industrial load is generally:*
a) Lagging ✅
b) Leading
c) Unity
d) Zero

29. *The main source of hydroelectric power is:*
a) Coal
b) Water flow ✅
c) Nuclear reaction
d) Wind

30. *The voltage level for long-distance transmission in India is typically:*
a) 11 kV
b) 33 kV
c) 132 kV & above ✅
d) 400 V

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### *Control Systems & Electronics*
31. *The gain of an inverting op-amp is given by:*
a) -Rf/Rin ✅
b) Rin/Rf
c) 1 + Rf/Rin
d) None of these

32. *A diode conducts when:*
a) Forward biased ✅
b) Reverse biased
c) Both (a) & (b)
d) None of these

33. *The output of a NOT gate is:*
a) Opposite of input ✅
b) Same as input
c) Always 1
d) Always 0

34. *A transistor operates as an amplifier in:*
a) Active region ✅
b) Saturation region
c) Cutoff region
d) None of these

35. *The SCR is a:*
a) Unidirectional device ✅
b) Bidirectional device
c) Mechanical switch
d) None of these

36. *The time delay in a 555 timer is set by:*
a) RC network ✅
b) LC network
c) RL network
d) None of these

37. *The feedback in an oscillator is:*
a) Positive ✅
b) Negative
c) Both (a) & (b)
d) None of these

38. *A Zener diode is used for:*
a) Rectification
b) Voltage regulation ✅
c) Amplification
d) None of these

 

39. *The output of an AND gate is HIGH when:*
a) All inputs are HIGH ✅
b) Any input is HIGH
c) All inputs are LOW
d) None of these

40. *The CMRR of an op-amp indicates its ability to reject:*
a) Common-mode signals ✅
b) Differential signals
c) Noise
d) None of these

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### *Measurement & Instrumentation*
41. *A moving coil instrument measures:*
a) AC only
b) DC only ✅
c) Both AC & DC
d) None of these

42. *The damping torque in a PMMC instrument is provided by:*
a) Air friction ✅
b) Eddy currents
c) Spring action
d) None of these

43. *A wattmeter measures:*
a) Voltage
b) Current
c) Power ✅
d) Energy

44. *The energy meter works on the principle of:*
a) Electromagnetic induction ✅
b) Hall effect
c) Thermoelectric effect
d) None of these

45. *A shunt resistance is used to extend the range of an ammeter.* (True/False) ✅

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### *Power Systems (Continued)*
46. *The main disadvantage of overhead transmission lines over underground cables is:*
a) Higher cost
b) More maintenance ✅ (due to exposure to weather)
c) Lower efficiency
d) None of these

47. *The function of a lightning arrester is to:*
a) Protect equipment from lightning surges ✅
b) Improve power factor
c) Reduce transmission losses
d) None of these

48. *The permissible voltage variation in India as per IE rules is:*
a) ±5%
b) ±10% ✅
c) ±20%
d) None of these

49. *Buchholz relay is used for the protection of:*
a) Transformers ✅ (against internal faults)
b) Generators
c) Transmission lines
d) None of these

50. *The main component of a substation that steps down voltage is the:*
a) Circuit breaker
b) Transformer ✅
c) Isolator
d) Lightning arrester

51. *The unit of apparent power is:*
a) Watt
b) VA (Volt-Ampere) ✅
c) VAR
d) kWh

52. *The main cause of voltage drop in transmission lines is:*
a) Resistance and reactance ✅
b) Capacitance
c) Inductance
d) None of these

53. *The standard transmission voltage in urban areas is usually:*
a) 11 kV ✅
b) 33 kV
c) 132 kV
d) 400 kV

54. *A relay is used in power systems for:*
a) Fault detection and isolation ✅
b) Voltage regulation
c) Power factor correction
d) None of these

55. *The main advantage of bundled conductors in transmission lines is:*
a) Reduced corona loss ✅
b) Increased current capacity
c) Lower voltage drop
d) None of these

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### *Electronics & Digital Circuits*
56. *The most commonly used semiconductor material is:*
a) Silicon ✅
b) Germanium
c) Gallium Arsenide
d) Carbon

57. *A full-wave rectifier uses:*
a) One diode
b) Two diodes
c) Four diodes ✅ (Bridge rectifier)
d) None of these

58. *The output of a logic gate is ‘1’ when all inputs are ‘0’. The gate is:*
a) AND
b) OR
c) NOR ✅
d) NAND

59. *The ripple factor of a full-wave rectifier is:*
a) 0.482 ✅
b) 1.21
c) 0.707
d) None of these

60. *A flip-flop is a:*
a) Combinational circuit
b) Sequential circuit ✅ (stores 1-bit data)
c) Analog circuit
d) None of these

61. *The binary equivalent of decimal ‘10’ is:*
a) 1000
b) 1010 ✅
c) 1100
d) 1110

62. *The function of a Schmitt trigger is to:*
a) Convert sine wave to square wave ✅
b) Amplify signals
c) Filter noise
d) None of these

63. *An ADC (Analog-to-Digital Converter) is used to:*
a) Convert digital signals to analog
b) Convert analog signals to digital ✅
c) Amplify signals
d) None of these

64. *The typical supply voltage for TTL logic gates is:*
a) 5V ✅
b) 12V
c) 3.3V
d) 24V

65. *The output impedance of an ideal op-amp is:*
a) Zero ✅
b) Infinite
c) 1 kΩ
d) None of these

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### *Control Systems*
66. *The transfer function of a system is defined as the ratio of:*
a) Output to input ✅
b) Input to output
c) Error to output
d) None of these

67. *A PID controller improves system response by:*
a) Reducing steady-state error ✅
b) Increasing delay
c) Decreasing stability
d) None of these

68. *The damping ratio (ζ) for critical damping is:*
a) 0
b) 1 ✅
c) 0.5
d) 2

69. *The time response of a first-order system is characterized by:*
a) Time constant (τ) ✅
b) Damping ratio
c) Natural frequency
d) None of these

70. *The gain margin of a stable system is:*
a) Positive ✅
b) Negative
c) Zero
d) None of these

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### *Renewable Energy & Miscellaneous*
71. *The main component of a solar PV system is:*
a) Solar panel ✅
b) Wind turbine
c) Diesel generator
d) None of these

72. *The efficiency of a solar cell is typically around:*
a) 10-20% ✅
b) 50-60%
c) 80-90%
d) 100%

73. *The main advantage of wind energy is:*
a) Renewable and pollution-free ✅
b) High maintenance cost
c) Requires large land area
d) None of these

74. *The primary fuel in a nuclear power plant is:*
a) Uranium ✅
b) Coal
c) Natural gas
d) Diesel

75. *The purpose of a charge controller in a solar system is to:*
a) Prevent battery overcharging ✅
b) Increase solar panel voltage
c) Reduce efficiency
d) None of these

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### *Measurement & Instrumentation (Continued)*
76. *A Lissajous pattern is used to measure:*
a) Frequency and phase difference ✅
b) Resistance
c) Power factor
d) None of these

77. *The accuracy of an instrument is defined as:*
a) Closeness to true value ✅
b) Repeatability
c) Sensitivity
d) None of these

78. *A CRO (Cathode Ray Oscilloscope) displays:*
a) Voltage vs. time ✅
b) Current vs. resistance
c) Power vs. frequency
d) None of these

79. *A megger is used to measure:*
a) Insulation resistance ✅
b) Voltage
c) Current
d) Power

80. *The principle of operation of a thermocouple is based on:*
a) Seebeck effect ✅
b) Piezoelectric effect
c) Hall effect
d) None of these

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### *Power Electronics*
81. *A thyristor can be turned off by:*
a) Applying gate pulse
b) Reducing anode current below holding current ✅
c) Increasing voltage
d) None of these

82. *The main application of an inverter is to:*
a) Convert DC to AC ✅
b) Convert AC to DC
c) Step-up voltage
d) None of these

83. *PWM (Pulse Width Modulation) is used to control:*
a) Voltage and frequency ✅
b) Only current
c) Only resistance
d) None of these

84. *A TRIAC is used for:*
a) AC power control ✅
b) DC power control
c) Signal amplification
d) None of these

85. *The main advantage of a buck converter is:*
a) Step-down voltage efficiently ✅
b) Step-up voltage
c) High power loss
d) None of these

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### *Safety & Earthing*
86. *The minimum earth resistance for a domestic wiring should be:*
a) 1 Ω
b) 5 Ω ✅ (as per IE rules)
c) 10 Ω
d) 100 Ω

87. *The colour of earth wire as per IEC standards is:*
a) Red
b) Green/Yellow ✅
c) Blue
d) Black

88. *Electric shock occurs due to:*
a) Current passing through the body ✅
b) High voltage
c) Static charge
d) None of these

89. *The purpose of an ELCB (Earth Leakage Circuit Breaker) is to:*
a) Protect against electric shock ✅
b) Improve power factor
c) Reduce voltage fluctuations
d) None of these

90. *The safest limit of current for a human body is:*
a) 1 mA
b) 5 mA ✅ (below 5 mA is considered safe)
c) 100 mA
d) 1 A

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### *Final 10 Questions (Miscellaneous)*
91. *The unit of magnetic flux is:*
a) Tesla
b) Weber ✅
c) Henry
d) Gauss

92. *The efficiency of a transformer is usually in the range:*
a) 50-60%
b) 95-99% ✅
c) 80-85%
d) 70-75%

93. *Hysteresis loss in a transformer depends on:*
a) Frequency and flux density ✅
b) Current only
c) Voltage only
d) None of these

94. *The slip ring in an induction motor is used in:*
a) Squirrel cage motor
b) Wound rotor motor ✅
c) Synchronous motor
d) None of these

95. *The power factor of a pure inductor is:*
a) 0 ✅
b) 1
c) 0.5
d) Leading

96. *The speed regulation of a DC shunt motor is:*
a) Poor
b) Good ✅
c) Zero
d) None of these

97. *A synchronous condenser is used to:*
a) Improve power factor ✅
b) Generate power
c) Store energy
d) None of these

98. *The most common type of fault in power systems is:*
a) Symmetrical fault
b) Line-to-ground fault ✅
c) Open circuit fault
d) None of these

99. *The breakdown voltage of a PN junction diode depends on:*
a) Doping concentration ✅
b) Temperature
c) Current
d) None of these

100. *The main advantage of a star-delta starter for induction motors is:*
a) Reduced starting current ✅
b) Increased torque
c) Higher speed
d) None of these

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### *Conclusion*
This *100 MCQ set* covers *core electrical engineering topics* for *JK SSB JE* exam preparation.

*Need more questions on a specific topic?* Let me know!

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*Best of luck for your exam!* 🎯