electrical engineering MCQs – Page 147

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 Review each marked answer and report any item that may be outdated or unclear.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
2921. For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?
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A. 1.6 Wb/m2

B. 1.3 Wb/m2

C. None of the above

D. 1.0 Wb/m2

E. 1.1 Wb/m2

2922. As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decrease

2923. The forced oil and air circulation method is usual one for transformers of capacities____________?
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A. upto 5 MVA

B. upto 10 MVA

C. upto 20 MVA

D. 30 MVA upwards
2924. In a JFET, IDSS is known as ________________?
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A. drain to source current

B. drain to source current with gate open

C. none of the above

D. drain to source current with gate shorted
2925. A negative clipper 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

2926. Materials exhibiting zero value of resistivity are known as ____________ ?
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A. conductors

B. insulators

C. semiconductors

D. superconductors
2927. A relay is ___________switch?
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A. None of the above

B. An electronic

C. A mechanical

D. An electromechanical
2928. As the junction temperature increases, the voltage breakdown point for Zener mechanism _______________?
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A. Is decreased

B. Is increased

C. Remains the same

D. None of the above

2929. If the load resistance decreases in a Zener regulator, then Zener current ______________?
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A. Stays the same

B. Increases

C. Decreases

D. None of the above

2930. A VTVM is never used to measure ______________?
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A. None of the above

B. Resistance

C. Voltage

D. Current
2931. A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?
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A. 10 O

B. 1 O

C. 100 O

D. 1 O

2932. A galvanometer in series with a high resistance is called_______________?
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A. None of the above

B. A wattmeter

C. A voltmeter

D. An ammeter

2933. In a D.C. machine the current per brush arm should not be more than_____________?
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A. 100 A

B. 200 A

C. 300 A

D. 400 A
2934. Commercial available medium size machines have a speed range of __________ ?
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A. 200 to 400 r.p.m

B. 2000 to 2500 r.p.m

C. 1000 to 1500 r.p.m

D. 600 to 1000 r.p.m

2935. In a multivibrator, we have___________ feedback?
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A. Negative

B. 100 % positive

C. Both positive and negative

D. None of the above

2936. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto_______________?
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A. 30 MW

B. 150 MW

C. 10 MW

D. 60 MW
2937. The maximum speed of electronic switch can be _____________operations per second?
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A. 109

B. 10

C. 104

D. 1000

2938. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ________________?
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A. 50 G

B. G/49

C. 49 G

D. G/50

2939. A JFET is also called____________ transistor?
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A. bipolar

B. unipolar

C. unijunction

D. none of the above

2940. In self cooled motors the cooling time constant is about ___________ than the heating time constant because cooling conditions are worse at standstill?
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A. 3 to 4 times greater

B. 4 to 5 times greater

C. 2 to 3 times greater

D. none of the above