electrical engineering MCQs – Page 34

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 Review each marked answer and report any item that may be outdated or unclear.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

661. The percentage 02 by volume in atmosphere air is____________?
0

A. 77%

B. 21%

C. 23%

D. 79%

662. In regenerative cycle feed water is heated by_____________?
0

A. heaters

B. all above

C. draining steam from the turbine

D. exhaust gases

663. One kilowatt hour is equal to_________?
0

A. 532 k cal.

B. 860 k cal.

C. 746 k cal.

D. 735 k cal.

664. The distributors for residential areas are______________?
0

A. single phase

B. three-phase three wire

C. three-phase four wire

D. none of the above

665. Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ?
0

A. Superposition of currents

B. Direct application of Kirehhoffs laws

C. Circulating current method

D. All of the above

E. Thevenins theorem

666. Which of the following materials is not used for transmission and distribution of electrical power________________?
0

A. Copper

B. Steel

C. Aluminium

D. Tungsten

667. In a surface condenser if air is removed, there is___________?
0

A. fall in absolute pressure maintained in condenser

B. no change in absolute pressure in the condenser

C. rise in temperature of condensed steam

D. rise in absolute pressure maintained in condenser

668. Which of the following bus-bar schemes has the lowest cost?
0

A. Single bus-bar scheme

B. Breaker and a half scheme

C. Ring bus-bar scheme

D. Main and transfer scheme

669. The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation?
0

A. pv = C

B. pv1A = C

C. pv

D. pv1i = C

670. The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?
0

A. 65 to 70%

B. 85 to 90%

C. 40 to 50%

D. 25 to 30%

671. Secondary air is the air used to______________?
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A. transport and dry the coal

B. provide air round the burners for getting optimum combustion

C. increase the flame length

D. reduce the flame length

672. Reduction in core losses and increase in permeability are obtained with transformer employing__________?
0

A. none of the above

B. core built-up of laminations of cold rolled grain oriented steel

C. core built-up of laminations of hot rolled sheet

D. either of the above

673. The presence of ozone due to corona is harmful because it________________?
0

A. reduces power factor

B. none of the above

C. gives odour

D. corrodes the material

E. transfer energy to the ground

674. Which of the following protection is normally not provided on small distribution transformers ?
0

A. Overfluxing protection

B. All of the above

C. Buchholz relay

D. Overcurrent protection

675. A shell-type transformer has_________?
0

A. none of the above

B. negligibly hysteresis losses

C. reduced magnetic leakage

D. high eddy current losses

676. In thermal power plant, heat from the flue gases is utilized in___________?
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A. economizer

B. condenser

C. super heater

D. chimney

677. The direction of rotation of a D.C. series motor can be changed by___________?
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A. None of the above

B. either of A. and B. above

C. interchanging field terminals

D. interchanging supply terminals

678. Rankine cycle efficiency of a good steam power plant may be in the range of____________?
0

A. 15 to 20 per cent

B. 90 to 95 per ceut

C. 35 to 45 per cent

D. 70 to 80 per cent

679. A circuit is disconnected by isolators when____________?
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A. line is energized

B. circuit breaker is not open

C. there is no current in the line

D. line is on full load

680. Load factor of a power station is defined as____________?
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A. average load x maximum demand

B. maximum demand/average load

C. none of the above

D. average load/maximum demand

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