electrical engineering MCQs – Page 178

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 Review each marked answer and report any item that may be outdated or unclear.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
3541. Class_____________ power amplifier has the highest collector efficiency ?
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A. B

B. A

C. C

D. AB

3542. An RC high-pass filter consists of an 820 ? resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz?
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A. 161 F

B. 81 F

C. 220 F

D. 0.161 F
3543. Equivalent capacitance is greater than individual capacitances in_____________?
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A. series combination

B. parallel combination

C. both series and parallel combinations

D. none of above

3544. If an electrons is allowed to move along the field in a non uniform electric field then it will follow__________________?
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A. Spiral path

B. Circular path

C. Curved path

D. Straight line
3545. CC configuration is used for impedance matching because its ________________?
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A. Input impedance is very high

B. Output impedance is very low

C. Input impedance is low

D. None of the above

3546. A gain of 1,000,000 times in power is expressed by_____________?
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A. 120 db

B. 600 db

C. 30 db

D. 60 db
3547. An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 410-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?
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A. 38.4msec-1

B. 384msec-1

C. 150msec-1

D. 200msec-1

3548. The driver stage usually employs_________________?
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A. Push-pull amplifier

B. None of the above

C. Class C amplifier

D. Class A power amplifier
3549. RC coupling is used for_____________amplification?
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A. Current

B. None of the above

C. Voltage

D. Power

3550. A.C can not be used for_______________?
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A. producing light

B. Magnetizing iron

C. producing heat

D. Producing magnetic field

3551. Electric intensity at infinite distance from the point charge is_____________?
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A. negative

B. infinite

C. zero

D. positive

3552. The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?
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A. 1.5Hzs

B. 106sec

C. 1sec

D. 1Hzs
3553. A.C cannot be used for_______________?
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A. all the above

B. producing light

C. producing heat

D. magnetizing and electroplating
3554. The purpose of capacitors in a transistor amplifier is to___________________?
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A. Protect the transistor

B. Couple or bypass a.c. component

C. Cool the transistor

D. Provide biasing

3555. A current amplification of 2000 is a gain of_________________?
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A. 3 db

B. 20 db

C. 200 db

D. 66 db
3556. The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is_____________?
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A. 200,000 ?

B. 20,000 ?

C. 100,000 ?

D. 1,000,000 ?

3557. In a certain low-pass filter, fc = 3.5 kHz. If the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?
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A. 5.97 V

B. 6 V

C. 597 mV

D. 0 V

3558. A certain circuit is composed of two parallel resistors. The total resistance is 1,403 ?. One of the resistors is 2 k?. The other resistor value is____________?
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A. 4.7 k?

B. 2 k?

C. 1,403 ?

D. 3,403 ?

3559. An RC high-pass filter consists of a 0.2 F capacitor and a 220 ? resistor. The output is taken across the resistor. The circuits critical frequency is_____________?
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A. 3,617 Hz

B. 362 Hz

C. 723 Hz

D. 7,234 Hz

3560. In class A operation, the operating point is generally located_____________of the d.c. load line?
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A. At cut off point

B. At the middle

C. At saturation point

D. None of the above