electrical engineering MCQs – Page 218

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 Review each marked answer and report any item that may be outdated or unclear.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
4341. The final stage of a multistage amplifier uses______________?
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A. Impedance coupling

B. RC coupling

C. Direct coupling

D. Transformer coupling
4342. 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. 27 db

C. 600 db

D. 24 db

4343. If the power level of an amplifier reduces to half, the db gain will fall by___________?
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A. 2 db

B. 10 db

C. 3 db

D. 5 db

4344. The lower and upper cut off frequencies are also called_____________frequencies?
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A. Resonant

B. Half-resonant

C. Sideband

D. Half-power
4345. The best frequency response is of_____________coupling?
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A. None of the above

B. RC

C. Transformer

D. Direct
4346. In an RC coupling scheme, the coupling capacitor CC must be large enough______________?
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A. Not to attenuate the low frequencies

B. To dissipate high power

C. None of the above

D. To pass d.c. between the stages

4347. The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?
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A. use of many capacitors

B. Power loss in the coupling device

C. The use of many transistors

D. Loading effect of the next stage
4348. The frequency response of transformer coupling is___________?
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A. Excellent

B. Poor

C. Good

D. Very good

4349. A radio receiver has____________of amplification?
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A. Three stages

B. Two stages

C. More than one stages

D. One stage

4350. Transformer coupling is used for__________amplification?
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A. Current

B. Power

C. None of the above

D. Voltage

4351. 1 db corresponds to_____________change in voltage or current level?
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A. 40%

B. 25%

C. 20%

D. 80%

4352. Transformer coupling is generally employed when load resistance is______________?
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A. None of the above

B. Small

C. Very large

D. Large

4353. _____________coupling provides the maximum voltage gain?
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A. Transformer

B. Direct

C. Impedance

D. RC

4354. The gain of an amplifier is expressed in db because_____________?
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A. Calculations become easy

B. It is a simple unit

C. None of the above

D. Human ear response is logarithmic
4355. The same signal in Problem 2 is applied to an RC high-pass filter. If the reactance is zero at the input frequency, the output voltage is____________?
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A. 12.73 V peak-to-peak

B. zero

C. 18 V peak-to-peak

D. 9 V peak-to-peak

4356. A parallel resonant band-pass filter consists of a 6.8 ? resistor in series with a parallel network made up of an 8 H coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 ?. What is the center frequency of the filter?
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A. 514 kHz

B. 5.03 MHz

C. 503 kHz

D. 5.14 MHz
4357. In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?
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A. 3.5 kHz

B. 7 kHz

C. 0 Hz to 3.5 kHz

D. 0 Hz

4358. In a certain low-pass filter, fc = 3.5 kHz. Its passband is____________?
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A. 7 kHz

B. 0 Hz

C. 0 Hz to 3.5 kHz

D. 3.5 kHz

4359. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency_____________?
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A. is 7 kHz

B. cannot be determined

C. is 10 kHz

D. is 12 kHz
4360. At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V.the filters bandwidth is____________?
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A. 11.5 Hz

B. 53 Hz

C. 530 Hz

D. 106 Hz