electrical engineering MCQs – Page 203

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 Review each marked answer and report any item that may be outdated or unclear.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

4041. An ideal OP-AMP is an ideal__________?
0

A. Current controlled Current source

B. Voltage controlled Voltage source

C. Voltage controlled Current source

D. Current controlled Voltage source

4042. Class_____________ power amplifier has the highest collector efficiency ?
0

A. A

B. B

C. AB

D. C

4043. The most costly coupling is _______________ coupling?
0

A. Impedance

B. Direct

C. RC

D. Transformer

4044. Power amplifiers handle ______________ signals compare to voltage amplifiers?
0

A. Small

B. Very small

C. Large

D. None of the above

4045. The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s. What is the power output ?
0

A. 1 W

B. None of the above

C. 2 W

D. 4 W

4046. A power amplifier has comparatively __________________ ?
0

A. Small

B. Very large

C. None of the above

D. Large

4047. What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?
0

A. None of the above

B. 2

C. 3

D. 7

4048. When a transistor is cut off _________________?
0

A. None of the above

B. Maximum voltage appears across transistor

C. Maximum current flows

D. Maximum voltage appears across load

4049. The size of a power transistor is made considerably large to________________?
0

A. Provide easy handling

B. None of the above

C. Dissipate heat

D. Facilitate connections

4050. The driver stage usually employs_________________?
0

A. Class A power amplifier

B. Push-pull amplifier

C. None of the above

D. Class C amplifier

4051. Transformer coupling can be used in______________amplifiers?
0

A. Only power

B. Only voltage

C. None of the above

D. Either power or voltage

4052. Class C amplifiers are used as ___________________?
0

A. AF amplifiers

B. None of the above

C. amplifiers

D. Detectors

4053. Low efficiency of a power amplifier results in_________________?
0

A. Less battery consumption

B. More battery consumption

C. Low forward bias

D. None of the above

4054. A class A power amplifier uses _________________?
0

A. None of the above

B. Three transistors

C. Two transistors

D. One transistor

4055. Power amplifiers generally use transformer coupling because transformer permits______________?
0

A. Distortionless output

B. Impedance matching

C. Cooling of the circuit

D. Good frequency response

4056. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?
0

A. 80%

B. 40%

C. 50%

D. 20%

4057. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
0

A. None of the above

B. Intermodulation

C. Frequency

D. Amplitude

4058. ________________ coupling is generally employed in power amplifiers?
0

A. Impedance

B. Transformer

C. RC

D. direct

4059. A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
0

A. 20 kO

B. 100 kO

C. 10 kO

D. 5 kO

4060. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?
0

A. 100V

B. 10V

C. 1V

D. 20V

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