electrical engineering MCQs – Page 277

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 Review each marked answer and report any item that may be outdated or unclear.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

5521. An oscillator employs___________feedback?
0

A. Neither positive nor negative

B. Data insufficient

C. Positive

D. Negative

5522. One condition for oscillation is_____________?
0

A. A gain around the feedback loop of one-third

B. A gain around the feedback loop of less than 1

C. A phase shift around the feedback loop of 180o

D. A phase shift around the feedback loop of 0o

5523. The crystal oscillator frequency is very stable due to___________of the crystal?
0

A. Low Q

B. Vibrations

C. High Q

D. Rigidity

5524. Hartley oscillator is commonly used in______________?
0

A. Radio receivers

B. Radio transmitters

C. None of the above

D. TV receivers

5525. Quartz crystal is most commonly used in crystal oscillators because:____________?
0

A. It has superior electrical properties

B. None of the above

C. It is easily available

D. It is quite inexpensive

5526. An oscillator converts __________?
0

A. mechanical power into a.c. power

B. power into a.c. power

C. power into d.c. power

D. none of the above

5527. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency____________?
0

A. Increases

B. Insufficient data

C. Decreases

D. Remains the same

5528. In an LC circuit, when the capacitor is maximum, the inductor energy is____________?
0

A. Maximum

B. None of the above

C. Half-way between maximum and minimum

D. Minimum

5529. In a phase shift oscillator, the frequency determining elements are _______________?
0

A. R and C

B. L and C

C. None of the above

D. R, L and C

5530. In an LC oscillator, the frequency of oscillator is____________L or C?
0

A. Proportional to square of

B. Directly proportional to

C. Inversely proportional to square root of

D. Independent of the values of

5531. A Wien bridge oscillator uses___________feedback?
0

A. Only positive

B. Only negative

C. Both positive and negative

D. None of the above

5532. In a phase shift oscillator, we use____________RC sections?
0

A. Two

B. Four

C. None of the above

D. Three

5533. The piezoelectric effect in a crystal is___________?
0

A. A change in resistance because of temperature

B. A change in frequency because of temperature

C. None of the above

D. A voltage developed because of mechanical stress

5534. ____________is a fixed frequency oscillator?
0

A. Hartely-oscillator

B. Phase-shift oscillator

C. Colpitts oscillator

D. Crystal oscillator

5535. For an oscillator to properly start, the gain around the feedback loop must initially be_________?
0

A. Greater than 1

B. 1

C. Less than 1

D. Equal to attenuation of feedback circuit

5536. Average resistance of human body is____________?
0

A. 2000 ohms

B. 1000 ohms

C. 500 ohms

D. 1500 ohms

5537. When earth fault occurs______________?
0

A. none of the above

B. voltage potential at the earth mat remains zero irrespective of fault

C. voltage potential at the earth mat increases due to grounding

D. voltage potential at the earth mat decreases due to grounding

5538. The size of the earth or ground wire is based on the______________?
0

A. maximum fault current carrying through the ground wire

B. rated current carrying capacity of the service line

C. depends on the soil resistance

D. both (A) and (C)

5539. For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?
0

A. to provide low impedance

B. to discharge the charging capacitance to ground

C. protection for operating personnel

D. both (B) and (C)

5540. 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____________?
0

A. Remains unaffected

B. Increases

C. Decreases

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