electrical engineering MCQs – Page 26

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 Review each marked answer and report any item that may be outdated or unclear.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

501. For the induced draught the fan is located_______________?
0

A. near bottom of furnace

B. anywhere permissible

C. near bottom of chimney

D. at the top of the chimney

502. Pipes carrying steam are generally made up of_____________?
0

A. copper

B. aluminium

C. cast iron

D. steel

503. The following system is not generally used?
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A. 1-phase 4 wire

B. 3-phase 4 wire

C. 1-phase 3 wire

D. 3-phase 3 wire

504. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?
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A. pv = C

B. pv1A = C

C. pvls=C

D. pv1126 = C

505. The square root of the ratio of line impedance and shunt admittance is called the___________?
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A. regulation of the line

B. surge impedance of the line

C. conductance of the line

D. none of the above

506. No-load speed of which of the following motor will be highest ?
0

A. Series motor

B. Shunt motor

C. Cumulative compound motor

D. Differentiate compound motor

507. Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?
0

A. Its rating is 2 kVA

B. Its secondary current is 5 A

C. Its secondary voltage is 400 V

D. It is a step-up transformer

E. Its secondary current is 20 A

508. In Rankine cycle the work output from the turbine is given by__________?
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A. change of temperature between inlet and outlet

B. change of internal energy between inlet and outlet

C. change of enthaply between inlet and outlet

D. change of entropy between inlet and outlet

509. During open circuit test of a transformer:
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A. primary is supplied full-load current

B. primary is supplied rated kVA

C. primary is supplied current at reduced voltage

D. primary is supplied rated voltage

510. For which of the following equipment current rating is not necessary?
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A. Load break switch

B. Circuit breakers

C. Isolators

D. Circuit breakers and load break switches

511. Load center in a power station is___________?
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A. center of coal fields

B. center of gravity of electrical system

C. center of maximum load of equipments

512. Which of the following D.C. distribution system is the simplest and lowest in first cost ?
0

A. Ring system

B. Radial system

C. Inter-connected system

D. None of the above

513. For an overhead line, the surge impedance is taken as________________?
0

A. 100200 ohms

B. 7080 ohms

C. 5001000 ohms

D. none of the above

E. 20-30 ohms

514. The voltage regulation in magnetic amplifier type voltage regulator is effected by__________?
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A. varying the resistance

B. varying the reactance

C. variable transformer

D. electromagnetic induction

515. Most of the high transmission lines in Pakistan are_______________?
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A. either of the above

B. none of the above

C. underground

D. overhead

516. In a transformer the resistance between its primary and secondary should be_____________?
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A. zero

B. 1000 Q

C. infinity

D. 10 Q

517. The artificial draught normally is designed to produce____________?
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A. less chimney gas temperature

B. all of the above

C. less smoke

D. more draught

518. If the load factor of a power station is high then its cost of generation will be_______?
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A. Remain same.

B. Low.

C. High.

D. Depend upon plant type.

519. _______________are the conductors, which connect the consumers terminals to the distribution?
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A. Service mains

B. Distributors

C. Feeders

D. None of the above

520. The draught produced, for a given height of the chimney and given mean temperature of chimney gases_______________?
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A. may increase or decrease with increase in outside air temperature

B. remains the same irrespective of outside air temperature

C. increases with increase in outside air temperature

D. decreases with increase in outside air temperature

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