electrical engineering MCQs – Page 123

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 Review each marked answer and report any item that may be outdated or unclear.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
2441. It is desirable to operate the arc furnaces at power factor of_____________?
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A. zero

B. 0.707 lagging

C. 0.707 leading

D. unity

2442. If the temperature of a crystal diode increases, then leakage current ______________?
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A. remains the same

B. increases

C. becomes zero

D. decreases

2443. When the 3-phase system is not grounded and if Single Line to Ground fault occurs, the voltage of the other two healthy phases will____________?
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A. Decreases

B. Remains unaffected

C. Increases
2444. The collector of a transistor is____________doped?
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A. heavily

B. none of the above

C. lightly

D. moderately
2445. A transistor is a___________operated device?
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A. current

B. voltage

C. both voltage and current

D. none of the above

2446. For an oscillator to properly start, the gain around the feedback loop must initially be_________?
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A. Equal to attenuation of feedback circuit

B. Less than 1

C. 1

D. Greater than 1
2447. In a transistor leakage current mainly depends on__________?
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A. temperature

B. doping of base

C. size of emitter

D. rating of transistor

2448. A source follower using an FET usually has a voltage gain which is___________?
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A. about -10

B. greater than +100

C. exactly unity but negative

D. slightly less than unity but positive

2449. Double tuned circuits are used in ____________ stages of a radio receiver?
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A. Output

B. IF

C. Audio

D. None of the above

2450. The Q of a tuned circuit refers to the property of_______________?
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A. Fidelity

B. Sensitivity

C. Selectivity

D. None of the above

2451. ___________ has the best damping properties?
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A. Diamond

B. Cast iron

C. High speed steel

D. Mild steel

2452. In TV transmission, sound signal is ______________modulated?
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A. Amplitude

B. Phase

C. None of the above

D. Frequency
2453. In a CB amplifier the maximum efficiency could be____________?
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A. 50%

B. 25%

C. 85%

D. 99%

2454. In parallel resonance, the circuit impedance is_________________?
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A. C/LR

B. CR/L

C. R/LC

D. L/CR
2455. The conductors have transport phenomena of electrons due to____________?
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A. electric field

B. electromagnetic field

C. none of the above

D. magnetic field

2456. The normal way to turn on a SCR is by______________?
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A. Appropriate anode current

B. Breakover voltage

C. Appropriate gate current

D. None of the above

2457. The conduction of electricity, in semiconductors, takes place due to movement of______________?
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A. positive ions only

B. positive and negative ions

C. electrons and holes

D. negative ions only

2458. A highly conductive material must have___________?
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A. good corrosion resistance

B. lowest temperature co-efficient

C. good mechanical strength

D. all of the above

E. easy solderable and drawable quality

F. highest conductivity

2459. The superconductivity is due to____________?
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A. none of the above

B. the electrons jump into nucleus at 0K

C. the crystal structure having no atomic vibration at 0K

D. all electrons interact in the super-conducting state

2460. An SCR is sometimes called ____________?
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A. Thyristor

B. Triac

C. Unijunction transistor

D. Diac