NTS GAT Subject (Electrical Engineering) FLP 2 Free Quiz

NTS GAT Subject (Electrical Engineering) – FLP 2

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NTS GAT Subject (Electrical Engineering) – FLP 2 consists of 100 MCQs covering 1 subjects. You have 120 minutes to complete it. Start with the easier questions and manage your time wisely. Good luck!

Electrical Engineering 100 MCQs

1. What does Kirchhoff's Current Law (KCL) state?

A. Sum of voltages around a loop is zero B. Sum of resistances in series is additive C. Sum of currents entering a node equals sum leaving D. Power is conserved in a circuit

2. What does Thevenin's theorem state?

A. Equivalent current source in parallel B. Superposition of sources C. Compensation theorem D. Equivalent voltage source in series

3. What is impedance in an AC circuit?

A. Z = R B. Z = XL + XC C. Z = R + j(XL - XC) D. Z = 1/Y

4. What is the reciprocal of impedance?

A. Impedance B. Conductance C. Reactance D. Admittance

5. What is the phase relationship between voltage and current in a purely inductive AC circuit?

A. Current is in phase with voltage B. Current leads voltage by 90° C. Current lags voltage by 90° D. Current is 180° out of phase

6. What is the voltage-current relationship for an inductor?

A. V = L di/dt B. I = C dV/dt C. V = IR D. P = VI

7. What is the unit of capacitance?

A. Henry (H) B. Ohm (Ω) C. Farad (F) D. Siemens (S)

8. What is the formula for inductive reactance?

A. XL = ωL B. XC = 1/(ωC) C. XL = 1/(ωL) D. XC = ωC

9. What are the main components of a communication system?

A. Transmitter, channel, receiver B. Transmitter only C. Receiver only D. Antenna only

10. What does phase modulation (PM) vary?

A. Phase B. Amplitude C. Frequency D. Both

11. What is the Shannon-Hartley theorem for channel capacity?

A. C = B * SNR B. C = B / SNR C. C = log2(B*SNR) D. C = B log2(1 + SNR)

12. What allows multiple signals over a single channel?

A. Spreading B. Coding C. Multiplexing D. Equalization

13. What does CDMA use to separate signals?

A. Orthogonal codes B. Frequency C. Time D. Phase

14. What is used to radiate and receive electromagnetic waves?

A. Amplifiers B. Filters C. Antennas D. Modulators

15. What is the gain of an antenna?

A. Efficiency B. Directivity C. Bandwidth D. Gain

16. What is Pulse Amplitude Modulation?

A. PAM B. PPM C. PWM D. PCM

17. What approximates analog samples to discrete levels in PCM?

A. Sampling B. Encoding C. Quantization D. Decoding

18. What is the quantization error?

A. Sampling error B. Aliasing error C. Coding error D. Quantization error

19. What is a control system?

A. Manages, commands, directs, or regulates B. Signal processor C. Amplifier D. Filter

20. What is the characteristic equation of a system?

A. Denominator of transfer function = 0 B. Numerator of transfer function = 0 C. Gain = 0 D. Input = 0

21. What does the final value theorem give?

A. Initial value B. Transient C. Steady-state value D. Error

22. What is the effect of a derivative controller?

A. Eliminates steady-state error B. Reduces rise time C. Proportional D. Improves stability and reduces overshoot

23. What does a Bode plot consist of?

A. Magnitude and phase versus frequency B. Root locus C. Nyquist D. Step response

24. What are gain margin and phase margin?

A. Steady-state measures B. Transient measures C. Error measures D. Stability margin measures

25. What determines overshoot and settling time in a second-order system?

A. Natural frequency B. Gain C. Damping ratio D. Time constant

26. What is the natural frequency?

A. Damping ratio B. Gain C. Natural frequency D. Time constant

27. What is peak overshoot?

A. Peak overshoot B. Settling time C. Rise time D. Delay time

28. Which gate is the complement of AND?

A. NAND B. NOR C. XOR D. XNOR

29. Which gate is the complement of OR?

A. NAND B. NOT C. NOR D. XOR

30. What are De Morgan's theorems?

A. (A+B)' = A' + B' B. (AB)' = A'B' C. (A+B)' = A'B' and (AB)' = A' + B' D. (A+B)' = AB

31. What is an edge-triggered memory element that stores one bit?

A. Latch (level-triggered) B. Gate C. Decoder D. Flip-flop (edge-triggered)

32. What is a level-sensitive memory element?

A. Flip-flop B. Latch C. Register D. Counter

33. Which flip-flop captures data at the clock edge?

A. SR B. JK C. T D. D

34. What converts binary code to multiple outputs?

A. Encoder B. Multiplexer C. Demultiplexer D. Decoder

35. What converts multiple inputs to binary code?

A. Decoder B. Encoder C. Multiplexer D. Demultiplexer

36. What selects one input from many?

A. Multiplexer B. Demultiplexer C. Decoder D. Encoder

37. What routes one input to many outputs?

A. Multiplexer B. Encoder C. Demultiplexer D. Decoder

38. How many inputs and outputs does a 3-to-8 decoder have?

A. 3 inputs, 3 outputs B. 8 inputs, 3 outputs C. 8 inputs, 8 outputs D. 3 inputs, 8 outputs

39. What is used for simplifying Boolean expressions?

A. Karnaugh map B. Truth table C. Logic gates D. Flip-flops

40. How many bits does a full-adder add?

A. Two bits B. One bit C. Three bits (two inputs + carry-in) D. Four bits

41. What outputs the binary code of the highest priority input?

A. Priority encoder B. Encoder C. Decoder D. Multiplexer

42. What principle does a transformer work on?

A. Electromagnetic induction B. Electrostatic induction C. Photovoltaic effect D. Thermoelectric effect

43. What is the turns ratio of a transformer?

A. N1/N2 = V2/V1 B. N1/N2 = I1/I2 C. N1/N2 = V1/V2 D. N1/N2 = P1/P2

44. What is the formula for synchronous speed of an induction motor?

A. Ns = 120f/P B. Ns = 60f/P C. Ns = 120P/f D. Ns = 60P/f

45. What is the purpose of a commutator in a DC motor?

A. Increase speed B. Decrease losses C. Convert AC to DC and maintain torque direction D. Change voltage

46. What is an autotransformer?

A. Two separate windings B. Three windings C. Single winding with a tap D. No core

47. What is the starting torque of a DC series motor?

A. Very high B. Very low C. Zero D. Constant

48. What does the short-circuit test on a transformer measure?

A. Iron losses B. Both C. Stray losses D. Copper losses

49. What type of supply excites the rotor of a synchronous motor?

A. AC supply B. Three-phase supply C. Single-phase supply D. DC supply

50. What is the characteristic of a stepper motor?

A. Discrete steps B. Continuous rotation C. Variable speed D. High speed

51. What is the phase relationship between magnetizing current and supply voltage in a transformer?

A. 90° out of phase B. In phase C. 180° out of phase D. 45° out of phase

52. What does Gauss's Law for electric fields state?

A. For magnetic fields B. For currents C. For potentials D. For electric fields

53. How many Maxwell's equations are there?

A. Three B. Four C. Five D. Six

54. What is the skin depth?

A. Wavelength B. Penetration depth C. Depth of penetration D. Skin depth

55. What did Maxwell add to Ampere's Law?

A. Conduction current B. Convection current C. Static current D. Displacement current

56. What is the time-harmonic form of the wave equation?

A. Poisson B. Laplace C. Helmholtz D. Maxwell

57. What is an example of a semiconductor material?

A. Silicon or germanium B. Copper C. Glass D. Superconductor

58. What is the primary function of a diode?

A. Amplifier B. Switch C. Rectifier (one-way current) D. Oscillator

59. What is the primary use of a Zener diode?

A. Rectification B. Voltage regulation C. Amplification D. Oscillation

60. What are the three terminals of a MOSFET?

A. Emitter, base, collector B. Anode, cathode, gate C. Source, base, drain D. Source, drain, gate

61. Which logic gate outputs 0 only when all inputs are 1?

A. AND B. NAND C. OR D. NOR

62. What is a flip-flop?

A. Amplifier B. Oscillator C. Bistable multivibrator storing one bit D. Rectifier

63. What sequential circuit cycles through states?

A. Register B. Decoder C. Multiplexer D. Counter

64. What circuit routes one input to many outputs?

A. Demultiplexer B. Multiplexer C. Encoder D. Decoder

65. What circuit passes certain frequencies and attenuates others?

A. Amplifier B. Oscillator C. Filter D. Rectifier

66. What filter passes frequencies above a cutoff?

A. Low-pass B. High-pass C. Band-pass D. Band-stop

67. What is a PLL used for?

A. Amplifier B. Rectifier C. Phase-locked loop D. Filter

68. What does power electronics deal with?

A. Conversion and control of electrical power B. Analog electronics C. Digital electronics D. Signal processing

69. What is a TRIAC?

A. Unidirectional B. DC only C. Bipolar D. Bidirectional thyristor

70. What does a rectifier do?

A. DC to AC B. AC to DC C. DC to DC D. AC to AC

71. What type of converter is used for isolated power supplies?

A. Flyback B. Boost C. Buck D. Cuk

72. What device conducts in one direction and blocks reverse voltage?

A. Thyristor B. Diode C. Transistor D. Triac

73. What thyristor can be turned off by a negative gate pulse?

A. SCR B. Triac C. IGBT D. GTO

74. What reduces switching losses?

A. Soft switching B. Hard switching C. Linear D. Nonlinear

75. What causes higher switching losses and EMI?

A. Soft switching B. Resonant C. Hard switching D. Zero switching

76. How is power converter efficiency calculated?

A. Output power / Input power B. Input power / Output power C. Output power + Input power D. Losses / Input power

77. What provides backup power?

A. Voltage regulator B. UPS C. Inverter D. Rectifier

78. What controls motor speed by varying frequency and voltage?

A. Variable Frequency Drive B. Constant speed C. Hardwired D. Manual

79. How many switches are used in a three-phase inverter?

A. Four switches B. Eight switches C. Six switches D. Twelve switches

80. What is the per-unit system in power systems?

A. A unit system B. A conversion factor C. A transformer ratio D. Normalization of quantities

81. Why are short circuit studies performed?

A. Load flow B. Short circuit C. Stability D. Economic dispatch

82. What does load flow analysis determine?

A. Voltage magnitudes and angles B. Fault currents C. Stability limits D. Harmonic content

83. What are the ABCD parameters in power systems?

A. Load flow parameters B. Fault analysis parameters C. Stability parameters D. Transmission line parameters

84. What is used for power factor correction?

A. Inductors B. Resistors C. Capacitors D. Transformers

85. What is the purpose of a circuit breaker?

A. Carry current B. Interrupt fault currents C. Measure voltage D. Step up voltage

86. What is the objective of economic load dispatch?

A. Maximize profit B. Minimize losses C. Maximize voltage D. Minimize operating costs

87. What is an advantage of HVDC over AC transmission?

A. Lower losses and asynchronous interconnection B. Higher losses C. Higher cost D. Lower reliability

88. What is the power factor of a purely resistive load?

A. Zero B. 0.5 C. 1.0 D. 0.8

89. What is a synchronous condenser?

A. A generator B. A transformer C. A capacitor bank D. A synchronous motor for reactive compensation

90. What is a continuous-time signal?

A. Defined at every instant B. Defined only at discrete instants C. Digital D. Quantized

91. What is the definition of the unit step function u(t)?

A. 1 for t<0, 0 for t≥0 B. -1 for t>0, 0 for t<0 C. 0 for t≥0, 1 for t<0 D. 0 for t<0, 1 for t≥0

92. What is the unit impulse function?

A. Constant at t=0 B. Zero except at t=0, area 1 C. Step function D. Ramp function

93. What is the impulse response of a system?

A. Impulse response B. Step response C. Ramp response D. Frequency response

94. What is BIBO stability?

A. Asymptotic stability B. Marginal stability C. Unstable D. BIBO stability

95. What represents a periodic signal as a sum of sinusoids?

A. Z-transform B. Fourier series C. Laplace transform D. Hilbert transform

96. What occurs when a signal is sampled below the Nyquist rate?

A. Aliasing B. Quantization C. Noise D. Distortion

97. What measures a signal's similarity with a shifted version?

A. Cross-correlation B. Convolution C. Filtering D. Autocorrelation

98. What describes power distribution in the frequency domain?

A. Power spectral density B. Amplitude spectrum C. Phase spectrum D. Time response

99. What does a pole at the origin in the s-plane represent?

A. Zero B. Differentiator C. Delay D. Integrator or constant

100. What is the ROC for a causal signal?

A. To the left of the leftmost pole B. Between poles C. To the right of the rightmost pole D. Outside all poles

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