electrical engineering MCQs – Page 101

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 Review each marked answer and report any item that may be outdated or unclear.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
2001. The arcing contacts in a circuit breaker are made of______________?
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A. aluminium alloy

B. porcelain

C. copper tungsten alloy

D. electrolytic copper

2002. An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed_____________?
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A. 39.5mV

B. 395mV

C. 795mV

D. 795mV
2003. Which of the following AC. motors is usually used in large motor-generator sets?
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A. Synchronous motor

B. Any of the above

C. Slip ring induction motor

D. Squirrel cage induction motor

2004. H.R.C. fuses provide best protection against________________?
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A. short-circuits

B. overload

C. open-circuits

D. reverse current

2005. Mercury, in arc rectifiers, is chosen for cathode because________________?
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A. it remains in liquid state at ordinary temperature

B. its atomic weight is quite high

C. its ionization potential is relatively low

D. its boiling point and specific heat are low

E. all of the above
2006. The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k?
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A. 110k

B. ?

C. 10k

D. 120k

2007. Admittance relay is __________ relay?
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A. directional

B. impedance

C. non-directional

D. none of the above

2008. Which of the following materials are diamagnetic ?
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A. Silver

B. Silver and copper

C. Copper

D. Iron

2009. Which of the following methods may be used to convert A.C. system to D.C ?
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A. All of the above

B. Motor converters

C. Rotary converters

D. Rectifiers

E. Motor-generator sets

2010. Temporary magnets are used in______________?
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A. loud-speakers

B. all of the above

C. motors

D. generators

2011. On which of the following effects of electric current a fuse operates ?
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A. Heating effect

B. Photoelectric effect

C. Electrostatic effect

D. Magnetic effect

2012. In a circuit breaker the basic problem is to________________?
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A. extinguish the arc

B. transmit large power

C. emit the ionizing electrons

D. maintain the arc

2013. Thermal circuit breaker has____________?
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A. delayed trip action

B. instantaneous trip action

C. both of the above

D. none of the above

2014. The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?
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A. heavy loads

B. internal short-circuits

C. all of the above

D. external short-circuits

2015. A rotary converter operates at a______________?
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A. none of the above

B. high power factor

C. low power factor

D. zero power factor

2016. Which of the following statements is correct ?
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A. The magnetic flux inside an exciting coil is lower than its outside surface

B. The magnetic flux inside the exciting coil is same as on its outside surface

C. The magnetic flux inside an exciting coil is zero

D. The magnetic flux inside the exciting coil is greater than its outside surface

2017. The use of permanent magnets is. not made in_____________?
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A. transformers

B. loud-speakers

C. magnetoes

D. energy meters

2018. On which of the following routine tests are conducted ?
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A. Minimum oil circuit breakers

B. All of the above

C. Oil circuit breakers

D. Air blast circuit breakers

2019. Magnetism of a magnet can be destroyed by_____________?
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A. heating

B. by inductive action of another magnet

C. by all above methods

D. hammering

2020. The torque produced in induction type relay (shaded pole structure) is_____________?
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A. proportional to square of the current

B. proportional to the current

C. inversely proportional to the square of the current

D. inversely proportional to the current