electrical engineering MCQs – Page 227

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

4521. Time constant of an inductive circuit_________?
0

A. increases with increase of inductance and decrease of resistance

B. increases with the decrease of inductance and decrease of resistance

C. increases with decrease of inductance and increase of resistance

D. increases with the increase of inductance and the increase of resistance

4522. The power is measured in terms of decibles in case of_________?
0

A. electronic equipment

B. transformers

C. current transformers

D. auto transformers

4523. The inductance of a coil can be increased by_________?
0

A. increasing core length

B. choosing core material having high relative permeability

C. decreasing the number of turns

D. decreasing the diameter of the former

4524. In an AC. circuit, a low value of kVAR compared with kW indicates_________?
0

A. low efficiency

B. maximum load current

C. high power factor

D. unity power factor

4525. In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of__________?
0

A. LorC

B. C only

C. L only

D. R only

E. R,LorC

4526. In AC. circuits, laminated iron is invariably used in order to__________?
0

A. increase heat radiation

B. make assembly cheap and easier

C. reduce circuit permeability

D. reduce eddy current loss

4527. Inductance of coil___________?
0

A. becomes zero with the increase in supply frequency

B. increases with the increase in supply frequency

C. decreases with the increase in supply frequency

D. is unaffected by the supply frequency

4528. The time constant of a series R-C circuit is given by____________?
0

A. RC2

B. R/C

C. R2C

D. RC

4529. In a parallel R-C circuit, the current always________the applied voltage?
0

A. leads

B. lags

C. none of the above

D. remains in phase with

4530. In a series L-C circuit at the resonant frequency the__________?
0

A. impedance is maximum

B. current is maximum

C. voltage across C is minimum

D. current is minimum

4531. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?
0

A. increase in temperature

B. skin effect

C. capacitive effect between adjacent coil turns

D. iron loss in core

4532. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?
0

A. be four times as high

B. be doubled

C. be reduced by half

D. be reduced to one fourth

4533. The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?
0

A. 111 V

B. 141.4 V

C. 282.8 V

D. 100 V

4534. If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?
0

A. 84.84 sin 25 t

B. 60 sin 25 t

C. 30 sin 50 t

D. 42.42 sin 3141

4535. Aphasoris________?
0

A. a line which represents the magnitude and phase of an alternating quantity

B. an instrument used for measuring phases of an unbalanced 3-phase load

C. a line representing the magnitude and direction of an alternating quantity

D. a coloured tag or band for distinction between different phases of a 3-phase supply

4536. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?
0

A. the current flowing in the inductor

B. the statement given is false

C. the big size of the inductor

D. the reactance of the inductor

4537. The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?
0

A. 60 sin 50 t

B. 60 sin 25 t

C. 84.84 sin 3141

D. 42.42 sin 314 t

4538. Which of the following statements pertains to resistors only _____________?
0

A. can act as energy storage devices

B. oppose sudden changes in voltage

C. can dissipate considerable amount of power

D. connecting them in parallel increases the total value

4539. Which of the following refers to a parallel circuit ?
0

A. The current through any one element is less than the source current

B. The equivalent resistance is greater than any one of the resistors

C. The voltage across element is in proportion to its resistance value

D. The current through each element is same

4540. In a three-phase supply floating neutral is undesirable because it way give rise to___________?
0

A. high voltage across the load

B. low voltage across the load

C. minimun voltage across the load

D. unequal line voltages across the load

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