electrical engineering MCQs – Page 287

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 Review each marked answer and report any item that may be outdated or unclear.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

5721. The value of stability factor for a base resistor bias is________________?
0

A. (+1)

B. (+1)RC

C. RB (+1)

D. 1-

5722. In a base resistor method, if the value of changes by 50, then collector current will change by a factor ___________________?
0

A. 100

B. 50

C. 200

D. 25

5723. The leakage current in a silicon transistor is about_____________ the leakage current in a germanium transistor?
0

A. One hundredth

B. One tenth

C. One thousandth

D. One millionth

5724. For proper amplification by a transistor circuit, the operating point should be located at the_____________ of the d.c. load line?
0

A. The maximum current point

B. None of the above

C. Middle

D. The end point

5725. Operating point represents__________________?
0

A. Zero signal values of IC and VCE

B. The magnitude of signal

C. Values of IC and VCE when signal is applied

D. None of the above

5726. In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 kO, what is the value of RE ?
0

A. 800 O

B. 1400 O

C. 1600 O

D. 2000 O

5727. The stability factor of a collector feedback bias circuit is_______________ that of base resistor bias?
0

A. More than

B. None of the above

C. Less than

D. The same as

5728. Transistor biasing represents ______________ conditions?
0

A. a.c

B. d.c

C. both a.c. and d.c

D. none of the above

5729. The disadvantage of base resistor method of transistor biasing is that it_________________?
0

A. None of the above

B. Is sensitive to changes in

C. Is complicated

D. Provides high stability

5730. Thermal runaway occurs when_________________?
0

A. Junction capacitance is high

B. Collector is reverse biased

C. Transistor is not biased

D. Emitter is forward biased

5731. If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to___________________?
0

A. 6 mA

B. 3 mA

C. mA

D. 1 mA

5732. In a transistor amplifier circuit VCE = VCB +________________?
0

A. 5 VBE

B. 2VBE

C. None of the above

D. VBE

5733. In the design of a biasing circuit, the value of collector load RC is determined by__________________?
0

A. VBE consideration

B. VCE consideration

C. None of the above

D. IB consideration

5734. An ideal value of stability factor is________________?
0

A. 1

B. More than 200

C. 200

D. 100

5735. The point of intersection of d.c. and a.c. load lines represents __________________?
0

A. Operating point

B. None of the above

C. Voltage gain

D. Current gain

5736. When the temperature changes, the operating point is shifted due to _______________?
0

A. Change in the values of circuit resistance

B. Change in ICBO

C. Change in VCC

D. None of the above

5737. The operating point is also called the _______________?
0

A. Cut off point

B. Saturation point

C. None of the above

D. Quiescent point

5738. The disadvantage of voltage divider bias is that it has _________________?
0

A. Low base current

B. None of the above

C. Many resistors

D. High stability factor

5739. For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor?
0

A. Be zero

B. Not fall below 0.7 V

C. Be between 0 V and 0.1 V

D. Be 0.01 V

5740. If the temperature increases, the value of VCE_________________?
0

A. Is decreased

B. Remains the same

C. Is increased

D. None of the above

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