electrical engineering MCQs – Page 67

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 Review each marked answer and report any item that may be outdated or unclear.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

1321. Which of the following is not an operating cost?
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A. Maintenance cost

B. Fuel cost

C. Salaries of high officials

D. Salaries of operating staff

1322. The load factor of domestic load is usually____________?
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A. 30 to 40%

B. 60 to 70%

C. 50 to 60%

D. 10 to 15%

1323. A closed path made by several branches of the network is known as____________?
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A. loop

B. branch

C. junction

D. circuit

1324. In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately
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A. six times

B. one-third

C. nine times

D. thrice

E. twice

1325. Annual depreciation cost is calculated by___________?
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A. sinking fund method

B. straight line method

C. both A. and B.

D. none of the above

1326. When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected______________?
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A. the motor stops

B. none of the above

C. it runs as a reluctance motor at a lower speed

D. it runs as a reluctance motor at the same speed

1327. The efficiency of a properly designed synchronous motor will usually fall in range___________?
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A. 99 to 99.5%

B. 60 to 70%

C. 75 to 80%

D. 85 to 95%

1328. During the commutation period in 3 phase converter, overlap time is____________?
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A. Dependent on the load current

B. Dependent on the voltage

C. Dependent on both the load current and load voltage behind the short circuit current

D. Independent on both the load current and load voltage

1329. The resistance LM will be____________?
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A. 6.66 Q

B. 20Q

C. 18Q

D. 12 Q

1330. For a power plant which of the following constitutes running cost?
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A. Cost of fuel

B. Cost of wages

C. Cost of lubricants

D. All of the above

1331. Which of the following power plants need the least period for installation ?
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A. Hydro-electric power plant

B. Nuclear power plant

C. Diesel power plant

D. Thermal power plant

1332. When the demand of consumers is not met by a power plant, it will resort to which of the following?
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A. Load shedding

B. Penalising high load consumers by increasing the charges for electricity

C. Efficient plant operation

D. Power factor improvement at the , generators

1333. Thevenin resistance Rth is found
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A. by short-circuiting the given two terminals

B. between any two open terminals

C. by removing voltage sources along with their internal resistances

D. between same open terminals as for Etk

1334. Most efficient plants are normally used as____________?
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A. base load plants

B. either A. or (b)

C. none of the above

D. peak load plants

1335. For a consumer the most economical power factor is generally____________?
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A. 0.5 leading

B. 0.95 lagging

C. 0.5 lagging

D. 0.95 leading

1336. Which of the following is not necessarily an advantage of interconnecting various power stations?
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A. Reduction in total installed capacity

B. Improved frequency of power supplied

C. Increased reliability

D. Economy in operation of plants

1337. In an interconnected system, the diversity factor of the whole system:
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A. remains unchanged

B. none of the above

C. increases

D. decreases

1338. The superposition theorem is applicable to____________?
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A. linear responses only

B. none of the above

C. linear and non-linear resistors only

D. linear, non-linear and time variant responses

1339. As the load is applied to a synchronous motor, the motor takes more armature current because
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A. the rotor strengthens the rotating field casuing more motor current

B. the increased load has to take more current

C. the back e.m.f. decreases causing an increase in motor current

D. the rotor by shifting its phase backward causes motor to take more current

1340. For high efficiency of transfer of power, internal resistance of the source should be____________?
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A. none of the above

B. equal to the load resistance

C. more than the load resistance

D. less than the load resistance

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