electrical engineering MCQs – Page 144

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
2861. Power transformers have rating_______________?
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A. above 200 kVA

B. equal to 50 kVA

C. equal to 100 kVA

D. none of the above

2862. An ammeter is connected in __________ with the circuit element whose current we wish to measure?
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A. Series or parallel

B. Parallel

C. Series

D. None of the above

2863. In an unregulated power supply, if input a.c. voltage increases, the output voltage _______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decreases

2864. Digital ICs process______________?
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A. Linear signals only

B. Digital signals only

C. Both digital and linear signals

D. None of the above

2865. Direct water cooling of rotor winding presents_____________?
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A. no mechanical difficulties

B. greater mechanical difficulties

C. none of the above

D. lesser mechanical difficulties

2866. Commercial power supplies have voltage regulation ______________?
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A. within 1%

B. of 15%

C. of 25%

D. of 10%

2867. At cut-off, the JFET channel is _____________?
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A. extremely narrow

B. reverse baised

C. at its widest point

D. completely closed by the depletion region
2868. The insulation between windings and grounded core and the insulation between the windings of the same phase is called__________________?
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A. major insulation

B. either of the above

C. none of the above

D. minor insulation

2869. ____________are used for construction of core of electromagnets?
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A. Either A. or B.

B. Soft magnetic materials

C. Hard magnetic materials

D. None of the above

2870. ____________ is the common method of applying brushes to the commntator?
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A. Reaction

B. Trailing

C. All of the above

D. Radial

2871. The laminations of the armature of a D.C. machine are usually ___________ thick?
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A. 0.4 to 0.5 mm

B. 0.2 to 0.3 mm

C. 0.1 to 0.2 mm

D. 0.3 to 0.4 mm

2872. If the cross-sectional area of the channel in n-channel JEFT increases, the drain current _____________?
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A. is increased

B. remains the same

C. none of the above

D. is decreased

2873. The positive clipper is that which removes the ____________half-cycles of the input voltage?
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A. Negative

B. Positive

C. Both positive and negative

D. None of the above

2874. In D.C. machines the width of the duct is usually_____________?
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A. 4 mm

B. 10 mm

C. 6 mm

D. 8 mm

2875. The flash point of transformer oil should be higher than_______________?
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A. 40C

B. 104C

C. 80C

D. 60C

2876. Which of the following methods may be adopted to reduce the effects of armature reaction ?
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A. Increasing reluctance of pole tips

B. Compensating windings

C. All of the above

D. Increase in length of air gap at pole tips

E. Interpoles

2877. The main disadvantage of a mechanical switch is that it_______________?
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A. Has high inertia

B. Is operated mechanically

C. Is costly

D. None of the above

2878. In a 15 V Zener diode , the breakdown mechanism will occur by ______________?
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A. Avalanche mechanism

B. Zener mechanism

C. Both Zener and avalanche mechanism

D. None of the above

2879. The cold rolled grain oriented steel has ___________ permeability in the direction of the grain orientation?
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A. none of the above

B. nil

C. minimum

D. maximum
2880. A JFET has three terminals, namely________________?
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A. none of the above

B. source, gate, drain

C. emitter, base, collector

D. cathode, anode, grid