electrical engineering MCQs – Page 334

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 Review each marked answer and report any item that may be outdated or unclear.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

6661. An SCR combines the features of ____________?
0

A. A rectifier and resistance

B. None of the above

C. A rectifier and capacitor

D. A rectifier and transistor

6662. An SCR behaves as a____________switch?
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A. Bidirectional

B. Mechanical

C. Unidirectional

D. None of the above

6663. An SCR has __________ pn junctions?
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A. Two

B. Four

C. None of the above

D. Three

6664. An SCR is sometimes called ____________?
0

A. Diac

B. Triac

C. Unijunction transistor

D. Thyristor

6665. An SCR is turned off by _________________?
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A. None of the above

B. Reverse biasing the gate

C. Reducing gate voltage to zero

D. Reducing anode voltage to zero

6666. An SCR is a solid state equivalent of ______________?
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A. Tetrode

B. Triode

C. Gas-filled triode

D. Pentode

6667. An SCR is a ____________ triggered device?
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A. Voltage

B. None of the above

C. Current

D. Voltage as well as current

6668. An SCR has three terminals viz ________________?
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A. Anode, cathode, grid

B. Cathode, anode, gate

C. None of the above

D. Anode, cathode, drain

6669. When an SCR is turned on, the voltage across it is about _____________?
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A. 1 V

B. 1 V

C. 10 V

D. Zero

6670. An SCR has ___________semiconductor layers?
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A. None of the above

B. Three

C. Two

D. Four

6671. When SCR starts conducting, then _____________ loses all control?
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A. Anode

B. None of the above

C. Gate

D. Cathode

6672. If firing angle in an SCR circuit is increased, the output _____________?
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A. None of the above

B. Remains the same

C. Is decreased

D. Is increased

6673. In normal operation of an SCR, gate is _____________w.r.t. cathode?
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A. None of the above

B. At zero potential

C. Negative

D. Positive

6674. When SCR is OFF, the current in the circuit is ________________?
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A. None of the above

B. Exactly zero

C. Small leakage current

D. Large leakage current

6675. In an SCR circuit the supply voltage is generally ___________ that of breakover voltage?
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A. Equal to

B. Greater than

C. None of the above

D. Less than

6676. The control element of an SCR is ______________?
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A. Anode

B. Anode supply

C. Gate

D. Cathode

6677. In an SCR circuit, the angle of conduction can be changed by__________________?
0

A. None of the above

B. Changing gate voltage

C. Reverse biasing the gate

D. Changing anode voltage

6678. An SCR is made of_______________?
0

A. Germanium

B. None of the above

C. Carbon

D. Silicon

6679. An SCR is turned off when ________________?
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A. Gate voltage is reduced to zero

B. None of the above

C. Anode current is reduced to zero

D. Gate is reverse biased

6680. The normal way to turn on a SCR is by______________?
0

A. Breakover voltage

B. None of the above

C. Appropriate gate current

D. Appropriate anode current

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