electrical engineering MCQs – Page 69

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 Review each marked answer and report any item that may be outdated or unclear.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

1361. The number of independent equations to solve a network is equal to_____________?
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A. the number of branches

B. sum of the number of branches and chords

C. sum of number of branches, chords and nodes

D. the number of chords

1362. Mostly, synchronous motors are of_____________?
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A. smooth cylindrical type machines

B. alternator type machines

C. salient pole type machines

D. induction type machines

1363. Salvage value of the plant is always____________?
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A. any of the above

B. negative

C. zero

D. positive

1364. Which of the following is the passive element?
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A. All of the above

B. Capacitance

C. Ideal current source

D. Ideal voltage source

1365. An over excited synchronous motor is used for____________?
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A. power factor corrections

B. variable speed loads

C. low torque loads

D. fluctuating loads

1366. Which of the following is not a method for estimating depreciation charges?
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A. Halseys 5050 formula

B. Straight line method

C. Diminishing value method

D. Sinking fund method

1367. If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then
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A. it runs at a slower speed

B. it continues to run at the same speed

C. the motor stops

D. it runs at a very high speed

1368. Which of the following source of power is least reliable?
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A. Wind power

B. iMHD

C. Geothermal power

D. Solar energy

1369. The concept on which Superposition theorem is based on_____________?
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A. non-linearity

B. duality

C. linearity

D. reciprocity

1370. In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch.
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A. superposition theorem

B. compensation theorem

C. above statement is associated with

D. none of the above

E. reciprocity theorem

1371. The size of a synchronous motor decreases with the increase in___________?
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A. speed

B. flux density

C. all of the above

D. horse power rating

1372. Which of the following motors will be used in electric clocks?
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A. D.C. series motor

B. D.C. shunt motor

C. A.C. induction motor

D. A.C. synchronous motor

1373. By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
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A. By interchanging any two phases

B. By changing the load

C. By changing the applied voltage

D. By changing the supply frequency

1374. The net armature voltage of a synchronous motor is equal to the_______________?
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A. arithmetic sum of Eb and V

B. arithmetic difference of Eb and V

C. vector difference of Eh and V

D. vector sum of Eb and V

1375. While calculating Rth in Thevenins theorem and Norton equivalent
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A. all voltage and current sources are made dead

B. all independent sources are made dead

C. only current sources are made dead

D. only voltage sources are made dead

1376. If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor
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A. will become less

B. will remain unchanged

C. none of the above.

D. will become more

1377. Generating capacity connected to the bus bars and ready to take load when switched on is known as____________?
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A. firm power

B. cold reserve

C. spinning reserve

D. hot reserve

1378. In Thevenins theorem, to find Z
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A. all independent current sources are short circuited and independent voltage sources are open circuited

B. all independent voltage sources are open circuited and all independent current sources are short circuited

C. all independent voltage and current sources are short circuited

D. all independent voltage sources are short circuited and all independent current sources are open circuited

1379. Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load. The above statement is associated with____________?
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A. Maximum power transfer theorem

B. Millmans theorem

C. Thevenins theorem

D. Superposition theorem

1380. Millmans theorem yields____________?
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A. equivalent voltage or current source

B. equivalent resistance

C. equivalent voltage source

D. equivalent impedance

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