electrical engineering MCQs – Page 134

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 Review each marked answer and report any item that may be outdated or unclear.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
2661. At series or parallel resonance, the circuit behaves as a ______________ load?
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A. Inductive

B. Capacitive

C. None of the above

D. Resistive
2662. Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1K? & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?
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A. 51dB

B. 102dB

C. 49dB

D. 98dB
2663. For frequencies below resonant frequency, a series LC circuit behaves as a _____________ load?
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A. None of the above

B. Resistive

C. Inductive

D. Capacitive
2664. A perfect conductor has_____________?
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A. none of the above

B. unity conductivity

C. zero conductivity

D. infinite conductivity
2665. An SCR has ___________semiconductor layers?
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A. Three

B. Two

C. Four

D. None of the above

2666. The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
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A. induction motor

B. synchronous motor

C. d.c. series motor .

D. d.c. shunt motor

2667. If the resistance of a tuned circuit is increased, the Q of the circuit _______________?
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A. Remains the same

B. Is increased

C. Is decreased

D. None of the above

2668. In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?
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A. all capacitors

B. all inductors

C. all transistors

D. all resistors

2669. An SCR behaves as a____________switch?
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A. Mechanical

B. Bidirectional

C. None of the above

D. Unidirectional
2670. If Q of an LC circuit increases, then bandwidth ______________?
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A. Insufficient data

B. Increases

C. Remains the same

D. Decreases
2671. For frequencies below the resonant frequency , a parallel LC circuit behaves as a ______________load?
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A. Inductive

B. None of the above

C. Capacitive

D. Resistive

2672. A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?
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A. Open-loop gain

B. Slew rate

C. Bandwidth

D. CMMR

2673. Which of the following material is not a semiconductor ?
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A. Gallium-arsenide

B. Selenium

C. Germanium

D. Silica
2674. In the above question, what is the power in sidebands?
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A. 8 kW

B. 06 kW

C. 6 kW

D. 9 kW

2675. Modulation refers to a low-frequency signal controlling the ________________?
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A. Phase of the carrier

B. May be any of the above

C. Amplitude of the carrier

D. Frequency of the carrier

2676. An SCR is a ____________ triggered device?
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A. Voltage as well as current

B. Voltage

C. Current

D. None of the above

2677. In series resonance, there is__________________?
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A. Voltage amplification

B. Current amplification

C. Both voltage and current amplification

D. None of the above

2678. Selenium is __________ semiconductor?
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A. P-type

B. extrnisic

C. intmisic

D. N-type

2679. Which of the following materials is preferred for transmitting electrical energy over long distance ?
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A. Aluminium

B. Steel reinforced copper

C. Steel reinforced aluminium

D. Copper

2680. In conductors conduction of electricity takes place due to movement of_______________?
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A. negative ions only

B. positive and negative ions

C. electrons only

D. positive ions only

E. none of the above