NTS GAT Subject (Electrical Engineering) FLP 3 Free Quiz

NTS GAT Subject (Electrical Engineering) – FLP 3

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NTS GAT Subject (Electrical Engineering) – FLP 3 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 is Ohm's Law?

A. V = IR B. V = I/R C. V = R/I D. V = I + R

2. 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

3. How do you calculate equivalent resistance for resistors in parallel?

A. 1/R1 + 1/R2 + ... B. R1 + R2 + ... C. R1*R2/(R1+R2) D. Sum of conductances

4. What is the formula for power in a DC circuit?

A. P = Q/t B. P = V/t C. P = VI D. P = IR

5. What is the internal resistance of an ideal voltage source?

A. Infinite internal resistance B. Constant current C. Zero internal resistance D. High internal resistance

6. What is the power factor in an AC circuit?

A. Sine of phase angle B. Cosine of phase angle C. Tangent of phase angle D. Cotangent of phase angle

7. What is the time constant of an RC circuit?

A. R/C B. RC C. L/R D. 1/(RC)

8. What quantity cannot change instantaneously in an inductor?

A. Voltage cannot change instantaneously B. Power cannot change instantaneously C. Charge cannot change instantaneously D. Current cannot change instantaneously

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 is modulation in communication systems?

A. Demodulation B. Encoding C. Modulation D. Decoding

11. What is the range of frequencies used by a signal called?

A. Amplitude B. Phase C. Bandwidth D. Power

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

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

13. What is the gain of an antenna?

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

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

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

15. What is a control system?

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

16. What are the poles of a transfer function?

A. Zeros B. Gains C. Poles D. Inputs

17. For stability, where must all poles of a system be?

A. Right half-plane B. Left half-plane C. Imaginary axis D. Origin

18. What criterion determines stability without solving the characteristic equation?

A. Routh-Hurwitz B. Nyquist C. Bode D. Root locus

19. 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

20. What does a root locus plot show?

A. Frequency response B. Root locus C. Bode plot D. Nyquist plot

21. What does a Bode plot consist of?

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

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

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

23. What is a critically damped system?

A. Underdamped B. Overdamped C. Undamped D. Critically damped

24. What is an underdamped system?

A. Critically damped B. Underdamped C. Overdamped D. Undamped

25. What is the natural frequency?

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

26. What is the settling time of a system?

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

27. What representation uses state variables?

A. Transfer function B. Frequency response C. State-space D. Impulse response

28. Which gate produces a high output only when all inputs are high?

A. OR B. XOR C. AND D. XNOR

29. Which gate is the complement of AND?

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

30. Which gate is the complement of OR?

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

31. What are the identity laws in Boolean algebra?

A. A + 0 = A, A * 1 = A B. A + 1 = 1 C. A * 0 = 0 D. A + A' = 1

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

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

33. What stores multiple bits of data?

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

34. What converts binary code to multiple outputs?

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

35. What selects one input from many?

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

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

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

37. What does a half-adder produce?

A. Two bits and borrow B. Three bits C. Subtractor D. Two bits, sum and carry

38. What type of adder reduces propagation delay?

A. Ripple-carry B. Carry look-ahead C. Serial D. Parallel

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

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

40. How many bits are used in BCD encoding?

A. 8-bit B. 16-bit C. 4-bit D. 3-bit

41. What is used to display decimal digits in digital circuits?

A. LCD B. LED C. OLED D. Seven-segment display

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 back EMF in a DC motor proportional to?

A. Proportional to current B. Constant C. Zero D. Proportional to speed and flux

46. Why is a transformer core laminated?

A. Reduce eddy current losses B. Increase flux C. Reduce copper losses D. Increase voltage

47. What does the open-circuit test on a transformer measure?

A. Copper losses B. Both copper and iron losses C. Iron losses (core losses) D. Stray losses

48. How can the direction of rotation of a three-phase induction motor be reversed?

A. Changing frequency B. Changing voltage C. Interchanging any two phases D. Changing load

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 are the components of core loss in a transformer?

A. Copper loss B. Stray loss C. Hysteresis and eddy current loss D. Dielectric loss

52. What does EMFT study?

A. Electric and magnetic fields B. Only electric fields C. Only magnetic fields D. Thermal fields

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

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

54. What is the magnetic flux through a closed surface according to Gauss's Law?

A. Non-zero B. Zero C. Infinite D. Variable

55. What does Faraday's Law state?

A. Changing magnetic field induces electric field B. Current induces magnetic field C. Electric flux through a surface D. Direction of induced current

56. What does Ampere's Law relate?

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

57. How many Maxwell's equations are there?

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

58. What is electric field intensity?

A. Force per unit charge B. Magnetic field C. Potential D. Current density

59. What is permittivity?

A. Permeability B. Permittivity C. Conductivity D. Susceptibility

60. What is the relationship between wavelength, frequency, and speed of light?

A. λ = c/f B. λ = f/c C. λ = c*f D. λ = c/f^2

61. What is the relationship between electric potential and electric field?

A. E = ∇V B. E = -∇V C. E = V D. E = -∂V/∂t

62. What does the gradient of a scalar field give?

A. Gradient B. Divergence C. Curl D. Laplacian

63. What does curl measure?

A. Divergence B. Gradient C. Laplacian D. Curl

64. What is the wave equation for electric field?

A. ∇²E = με ∂²E/∂t² B. ∇²E = 0 C. ∇²E = -ρ/ε D. ∇²E + k²E = 0

65. What is the propagation constant?

A. Propagation constant B. Impedance C. Admittance D. Reflection coefficient

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

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

67. What are the three regions of a BJT?

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

68. What type of device is a FET?

A. Current-controlled B. Power-controlled C. Voltage-controlled D. Frequency-controlled

69. What is the boolean expression for an XOR gate?

A. A'B + AB' B. A + B C. AB D. A'B'

70. What is a flip-flop?

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

71. What sequential circuit cycles through states?

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

72. What circuit passes certain frequencies and attenuates others?

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

73. What is a PLL used for?

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

74. What does power electronics deal with?

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

75. What is a TRIAC?

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

76. What does a rectifier do?

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

77. What does a buck converter do?

A. Steps down voltage B. Steps up voltage C. Both D. Isolation

78. What is the duty cycle in PWM?

A. Off-time B. Frequency C. Amplitude D. On-time / Total period

79. What device combines MOSFET and BJT characteristics?

A. IGBT B. MOSFET C. BJT D. Thyristor

80. 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

81. What does power factor correction do?

A. Increase power B. Decrease power C. Increase losses D. Improve power factor

82. Why are short circuit studies performed?

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

83. What does load flow analysis determine?

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

84. What are the ABCD parameters in power systems?

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

85. What is used for power factor correction?

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

86. What are symmetrical components used for?

A. Positive, negative, zero sequence B. Harmonics C. Transients D. Load flow

87. What is the purpose of a circuit breaker?

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

88. What is a busbar in a power system?

A. A transformer B. A generator C. A common connection point (busbar) D. A load

89. What is the objective of economic load dispatch?

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

90. What is HVDC transmission?

A. AC transmission B. HVDC transmission C. Both D. Neither

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

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

92. What is the load factor?

A. Average load / Peak load B. Peak load / Average load C. Average load * Peak load D. 1 - Average/Peak

93. 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

94. What transform converts a time-domain signal to the s-domain?

A. Fourier transform B. Z-transform C. Laplace transform D. Walsh-Hadamard transform

95. What transform converts a time-domain signal to the frequency domain?

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

96. What operation combines two signals to produce a third?

A. Convolution B. Correlation C. Addition D. Multiplication

97. What is a time-invariant system?

A. Linear B. Non-linear C. Time-varying D. Time-invariant

98. What is a causal system?

A. Non-causal B. Causal C. Anticausal D. Memoryless

99. What is the impulse response of a system?

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

100. What filter attenuates high-frequency components?

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

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