electrical engineering MCQs – Page 176

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 Review each marked answer and report any item that may be outdated or unclear.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
3501. In a series resonant band-pass filter, a lower value of Q results in______________?
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A. a higher resonant frequency

B. a higher impedance

C. a smaller bandwidth

D. a larger bandwidth
3502. ________________ coupling is generally employed in power amplifiers?
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A. Transformer

B. direct

C. Impedance

D. RC

3503. The practical illustration of the phenomenon of mutual induction is____________?
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A. D.C dynamo

B. transformer

C. induction coil

D. A.C generator

3504. A 2-transistor class B power amplifier is commonly called ______________ amplifier?
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A. Differential

B. Symmetrical

C. Push-pull

D. Dual

3505. The ear is not sensitive to___________?
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A. Frequency distortion

B. Amplitude distortion

C. e of the above

D. Frequency as well as amplitude distortion

3506. In transistor amplifiers, we generally use______________ capacitors?
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A. Mica

B. Paper

C. Electrolytic

D. Air

3507. The value of collector load RC in a transistor amplifier is _______________the output impedance of the transistor?
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A. Less than

B. The same as

C. More than

D. None of the above

3508. The push-pull circuit must use ______________ operation?
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A. Class C

B. Class AB

C. Class B

D. Class A

3509. An RC low-pass filter consists of a 120 ? resistor and a 0.002 F capacitor. The output is taken across the capacitor. The circuits critical frequency is___________?
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A. 333 kHz

B. 331 kHz

C. 60 kHz

D. 633 kHz
3510. Low efficiency of a power amplifier results in_________________?
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A. More battery consumption

B. Low forward bias

C. None of the above

D. Less battery consumption

3511. A gain of 1000 times in voltage is expressed by_______________?
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A. 120 db

B. 60 db

C. 30 db

D. 600 db

3512. In a certain five-step R/2R ladder network, the smallest resistor value is 1 k?. The largest value is___________?
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A. 10 k?

B. Indeterminable

C. 2 k?

D. 20 k?

3513. The metallic spheres A and B of radii 2m and 4m respectively carry the same charge 4 x 10 8C. If the spheres are connected by a copper wire_______________?
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A. charge will flow from A to B

B. charge will flow from B to A

C. no flow of charge will occur

D. both a and b are possible

3514. RC coupling is generally confined to low power applications because of____________?
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A. Large value of coupling capacitor

B. None of the above

C. Low efficiency

D. Large number of components

3515. An electric field can deflect_______________?
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A. Neutrons

B. X-rays

C. Both glass rod and silk acquire a negative charge

D. None
3516. When we rub a glass rod with a silk cloth then________________?
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A. glass rod acquires negative charge while silk acquires positive charge

B. glass rod acquires positive charge while silk acquires negative charges

C. both glass rod and silk acquire negative charge

D. both glass rod and silk acquire positive charge

3517. The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?
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A. Collector supply VCC

B. None of the above

C. Biasing circuit

D. Transistor

3518. A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time ?t then what is the emf induced in the coil ?
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A. ?B(r22-r12)/?t

B. ?B(r2-r1)2/?t

C. ?B/r22-r12/?t

D. ?B(r22+r12)/?t

3519. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?
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A. 20%

B. 50%

C. 40%

D. 80%

3520. If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?
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A. 14 db

B. 24 db

C. 600 db

D. 27 db