electrical engineering MCQs – Page 77

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 Review each marked answer and report any item that may be outdated or unclear.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

1521. The breakdown of insulation of the cable can be avoided economically by the use of___________?
0

A. inter-sheaths

B. insulating materials with different dielectric constants

C. both (A) and (B)

D. none of the above

1522. Excessive formation of lead sulphate on the surface of the plates happens because of___________?
0

A. low level of electrolyte

B. topping up with electrolyte

C. allowing a battery to stand in discharged condition for a long time

D. all above

E. persistent undercharging

1523. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?
0

A. all H2S04

B. two parts H2O, two parts H2SO4

C. one part H2O, three parts H2SO4

D. three parts H2O, one part H2SO4

1524. Capacitive reactance is more when_______?
0

A. capacitance is more and frequency of supply is less

B. capacitance is less and frequency of supply is more

C. capacitance is more and frequency of supply is more

D. capacitance is less and frequency of supply is less

1525. Specific gravity of electrolyte in Edison cell is_____________?
0

A. 1.21

B. 1.1

C. 0.8

D. 0.95

1526. In capacitance grading a homogeneous dielectric is used
0

A. Yes

B. No

1527. The insulation of the cable decreases with__________?
0

A. the decrease in the length of the insulation

B. none of the above

C. either A. or (b)

D. the increase in length of the insulation

1528. For a cell to work, which of the following condition(s) become necessary ___________?
0

A. All above three conditions are necessary

B. Electrolyte liquid or paste should be conducting

C. Electrolyte must chemically react with one of the electrodes

D. Two electrodes of different metas should be inserted in the electrolyte, not touching each other

1529. The active materials on the positive and negative plates of a fully charged lead-acid battery are_______?
0

A. none of the above

B. lead peroxide and lead

C. lead and lead peroxide

D. lead sulphate and lead

1530. In the cables, sheaths are used to___________?
0

A. none of the above

B. provide proper insulation

C. prevent the moisture from entering the cable

D. provide enough strength

1531. In a loss-free R-L-C circuit the transient current is__________?
0

A. non-oscillating

B. square wave

C. oscillating

D. sinusoidal

1532. A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
0

A. the capacitive reactance in ohms

B. the statement is incorrect

C. the current flowing in capacitor

D. the size of the capacitor being quite big

1533. The material for armouring on cable is usually__________?
0

A. steel tape

B. any of the above

C. galvanised steel wire

D. none of the above

1534. Wire-wound resistors are unsuitable for use at high frequencies because they_______?
0

A. create more electrical noise

B. exhibit unwanted inductive and capacitive effects

C. are likely to melt under excessive eddy current heat

D. consume more power

1535. Life of the batteries is in the following ascending order____________?
0

A. Lead-acid cell, Nickel-cadmium cell, Edison cell

B. Nickel-cadmium cell, Edison cell, lead-acid cell

C. Edison cell, Nickel-cadmium cell, lead-acid cell

D. Lead-acid cell, Edison cell, Nickel cadmium cell

1536. It is difficult to maintain oil filled cables____________?
0

A. No

B. Yes

1537. Internal resistance of a cell is due to___________?
0

A. surface contact resistance between electrode and electrolyte

B. electrode resistance

C. resistance of electrolyte

D. all above

1538. When a lead-acid battery is in fully charged condition, the color of its positive plate is__________?
0

A. brown

B. none of above

C. dark brown

D. dark grey

1539. In a pure resistive circuit__________?
0

A. current can lead or lag the voltage by 90

B. current is in phase with the voltage

C. current lags behind the voltage by 90

D. current leads the voltage by 90

1540. 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. 60 sin 25 t

B. 84.84 sin 25 t

C. 30 sin 50 t

D. 42.42 sin 3141

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