electrical engineering MCQs – Page 217

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 Review each marked answer and report any item that may be outdated or unclear.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
4321. The number of stages that can be directly coupled is limited because___________?
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A. None of the above

B. Changes in temperature cause thermal instability

C. Circuit becomes heavy and costly

D. It becomes difficult to bias the circuit

4322. In the initial stages of a multistage amplifier, we use______________?
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A. None of the above

B. RC coupling

C. Direct coupling

D. Transformer coupling

4323. Transformer coupling provides high efficiency because___________?
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A. resistance is low

B. none of the above

C. Collector voltage is stepped up

D. collector voltage is stepped down

4324. The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?
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A. 2 mV

B. 8 mV

C. 5 mV

D. 5 mV
4325. RC coupling is not used to amplify extremely low frequencies because____________?
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A. Electrical size of coupling capacitor becomes very large

B. There is considerable power loss

C. None of the above

D. There is hum in the output

4326. The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?
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A. Data insufficient

B. The same as

C. Less than

D. More than
4327. The value of emitter capacitor CE in a multistage amplifier is about____________?
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A. 50 F

B. 1 F

C. 100 pF

D. 0.01 F

4328. A gain of 1000 times in voltage is expressed by_______________?
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A. 120 db

B. 600 db

C. 30 db

D. 60 db
4329. RC coupling is used for_____________amplification?
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A. Power

B. Voltage

C. Current

D. None of the above

4330. In practice, voltage gain is expressed______________?
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A. None of the above

B. In db

C. In volts

D. As a number

4331. In transistor amplifiers, we use_____________transformer for impedance matching?
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A. e of the above

B. Same turn ratio

C. Step down

D. Step up

4332. The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?
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A. 6 W

B. 68 W

C. 2 W

D. None of the above

4333. The upper or lower cut off frequency is also called______________frequency?
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A. 3 db

B. Sideband

C. None of the above

D. Resonant

4334. The ear is not sensitive to___________?
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A. Amplitude distortion

B. Frequency distortion

C. e of the above

D. Frequency as well as amplitude distortion

4335. The purpose of RC or transformer coupling is to_____________?
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A. e of the above

B. Increase thermal stability

C. Block a.c.

D. Separate bias of one stage from another
4336. RC coupling is generally confined to low power applications because of____________?
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A. Large number of components

B. None of the above

C. Low efficiency

D. Large value of coupling capacitor

4337. An advantage of RC coupling scheme is the___________?
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A. High efficiency

B. Economy

C. None of the above

D. Good impedance matching

4338. 1 db corresponds to_____________change in power level?
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A. 35%

B. 22%

C. 50%

D. 26%
4339. In obtaining the frequency response curve of an amplifier, the______________?
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A. Generator output level is held constant

B. Generator frequency is held constant

C. Amplifier frequency is held constant

D. Amplifier level output is kept constant

4340. When a multistage amplifier is to amplify d.c. signal, then one must use_____________coupling?
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A. Transformer

B. RC

C. None of the above

D. Direct