electrical engineering MCQs – Page 182

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 Review each marked answer and report any item that may be outdated or unclear.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

3621. RC coupling is not used to amplify extremely low frequencies because____________?
0

A. There is hum in the output

B. None of the above

C. There is considerable power loss

D. Electrical size of coupling capacitor becomes very large

3622. The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?
0

A. Power loss in the coupling device

B. Loading effect of the next stage

C. use of many capacitors

D. The use of many transistors

3623. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency_____________?
0

A. is 7 kHz

B. is 12 kHz

C. cannot be determined

D. is 10 kHz

3624. 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____________?
0

A. 9 V peak-to-peak

B. 18 V peak-to-peak

C. zero

D. 12.73 V peak-to-peak

3625. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
0

A. Frequency

B. None of the above

C. Amplitude

D. Intermodulation

3626. Transformer coupling is generally employed when load resistance is______________?
0

A. Large

B. Very large

C. Small

D. None of the above

3627. It is generally desired that a transistor should have_____________________ input impedance?
0

A. Very high

B. High

C. Low

D. Very low

3628. The lower and upper cut off frequencies are also called_____________frequencies?
0

A. Sideband

B. Resonant

C. Half-power

D. Half-resonant

3629. An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?
0

A. 5 db

B. 8 db

C. 4 db

D. 6 db

3630. In a seriesparallel circuit, individual component power dissipation are calculated using_____________?
0

A. total current squared multiplied by the resistor values

B. a percent of the voltage division ratio squared

C. individual component parameters

D. a percent of the total power depending on resistor ratios

3631. Transformer coupling can be used in______________amplifiers?
0

A. None of the above

B. Only voltage

C. Either power or voltage

D. Only power

3632. The output stage of a multistage amplifier is also called _________________-?
0

A. Power stage

B. Mixer stage

C. Detector stage

D. F stage

3633. A transistor converts __________________?
0

A. none of the above

B. c. power into d.c. power

C. c. power into a.c. power

D. high resistance into low resistance

3634. If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is_____________________?
0

A. 165

B. None of the above

C. 165 x 104

D. 100

3635. Power amplifiers handle ______________ signals compare to voltage amplifiers?
0

A. None of the above

B. Large

C. Small

D. Very small

3636. 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 ?
0

A. 2 W

B. 6 W

C. 68 W

D. None of the above

3637. If the input capacitor of a transistor amplifier is short-circuited, then_________________?
0

A. Signal will not reach the base

B. Transistor will be destroyed

C. None of the above

D. Biasing conditions will change

3638. The value of emitter capacitor CE in a multistage amplifier is about____________?
0

A. 1 F

B. 50 F

C. 100 pF

D. 0.01 F

3639. A voltage divider consists of two 68 k? resistors and a 24 V source. The unknown output voltage is______________?
0

A. 24 V

B. 12 V

C. 0 V

D. 6 V

3640. Three 10 k? resistors are connected in series. A 20 k? resistor is connected in parallel across one of the 10 k? resistors. The voltage source is 24 V. The total current in the circuit is___________?
0

A. 90 mA

B. 9 mA

C. 800 ?A

D. 900 ?A

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