electrical engineering MCQs – Page 288

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 Review each marked answer and report any item that may be outdated or unclear.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
5741. The zero signal IC is generally ______________ mA in the initial stages of a transistor amplifier?
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A. More than 10

B. 1

C. 3

D. 4

5742. The circuit that provides the best stabilization of operating point is___________________?
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A. Potential divider bias

B. Base resistor bias

C. None of the above

D. Collector feedback bias

5743. Transistor biasing is generally provided by a_______________?
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A. Biasing circuit

B. Bias battery

C. Diode

D. None of the above

5744. For proper operation of the transistor, its collector should have___________________?
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A. Proper forward bias

B. Very small size

C. Proper reverse bias

D. None of the above

5745. In a particular biasing circuit, the value of RE is about _________________?
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A. 10 kO

B. 800 O

C. 1 MO

D. 100 kO

5746. In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?
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A. V

B. 8 V

C. 7 V

D. 3 V

5747. The purpose of resistance in the emitter circuit of a transistor amplifier is to _________________?
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A. Provide base-emitter bias

B. None of the above

C. Limit the maximum emitter current

D. Limit the change in emitter current
5748. The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 A, then IC will change by___________________?
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A. 20 A

B. 50 A

C. 25 A

D. 100 A

5749. Transistor biasing is done to keep _____________in the circuit?
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A. Proper alternating current

B. Collector current small

C. The base current small

D. Proper direct current
5750. The base resistor method is generally used in ________________?
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A. Rectifier circuits

B. Amplifier circuits

C. None of the above

D. Switching circuits
5751. For germanium transistor amplifier, VCE should_______________for faithful amplification?
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A. None of the above

B. Be zero

C. Be 0.2 V

D. Not fall below 0.7 V
5752. The operating point ________________ on the a.c. load line?
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A. Also line

B. May or may not lie

C. Data insufficient

D. Does not lie

5753. In the above question (Q38.) , what is the collector voltage ?
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A. 6 V

B. 8 V

C. 3 V

D. 7 V

5754. If the value of collector current IC increases, then the value of VCE ______________?
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A. Remains the same

B. None of the above

C. Increases

D. Decreases
5755. The voltage gain of an emitter follower is _____________?
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A. Approximately equal to 1

B. Greater than 1

C. None of the above

D. Much less than 1

5756. The gain of an amplifier with feedback is known as____________gain?
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A. Open loop

B. None of the above

C. Closed loop

D. Resonant

5757. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately________________?
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A. 5000

B. 1000

C. 100

D. 500

5758. Negative feedback is employed in __________________?
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A. Rectifiers

B. None of the above

C. Oscillators

D. Amplifiers
5759. The output impedance of an emitter follower is______________?
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A. Almost zero

B. Very high

C. Low

D. High

5760. When current feedback (negative) is applied to an amplifier, its output impedance ________________?
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A. Remains the same

B. None of the above

C. Is increased

D. Is decreased