electrical engineering MCQs – Page 263

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 Review each marked answer and report any item that may be outdated or unclear.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

5241. Permeance is the reciprocal of______________?
0

A. ampere-turns

B. reluctance

C. flux density

D. resistance

5242. Armature coil is short circuited by brushes when it lies_____________?
0

A. along field axis

B. in none of the above positions

C. in any of the above positions

D. along neutral axis

5243. In case of D.C. machine winding, number of commutator segments is equal to______________?
0

A. number of armature turns

B. number of armature conductors

C. number of armature coil sides

D. number of armature coils

5244. In a D.C. generator:___________________?
0

A. internal characteristic = magnetisation characteristic ohmic drop

B. magnetisation characteristic = external characteristic

C. external resistance = internal char-acteristic armature reaction

D. external characteristic = magnetisation characteristic ohmic drop armature reaction

5245. Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?
0

A. 0.005 mm

B. 0.05 mm

C. 0.5 m

D. 5 m

5246. Armature reaction of an unsaturated D.C. machine is_____________?
0

A. crossmagnetising

B. none of above

C. demagnetising

D. magnetising

5247. In lap winding, the number of brushes is always_____________?
0

A. same as the number of poles

B. double the number of poles

C. two

D. half the number of poles

5248. Interpole flux should be sufficient to_____________?
0

A. neutralise the commutating self induced e.m.f.

B. neutralise the armature reaction flux

C. neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil

D. perform none of the above functions

5249. If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to______________?
0

A. increase the field resistance

B. reverse the field connections

C. increase the speed of primemover

D. check armature insulation resistance

5250. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________?
0

A. the same as rated voltage

B. high

C. zero

D. small

5251. The e.m.f. generated in a D.C. generator is directly proportional to____________?
0

A. number of poles

B. all of the above

C. speed of armature

D. flux/pole

5252. When two D.C. series generators are running in parallel, an equilizer bar is used________________?
0

A. to increase the speed and hence generated e.m.f.

B. to increase the series flux

C. so that two similar machines will pass approximately equal currents to the load

D. to reduce the combined effect of ar-mature reaction of both machines

5253. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by_____________?
0

A. using conductor of annealed copper

B. using commutator with large number of segments

C. using carbon brushes of superior quality

D. using equiliser rings

5254. A D.C. welding generator has____________?
0

A. wave moving

B. lap winding

C. any of the above

D. duplex winding

5255. Shunt generators are most suited for stable parallel operation because of their______________?
0

A. identical voltage characteristics

B. rising voltage characteristics

C. drooping voltage characteristics

D. linear voltage characteristics

5256. The armature core of a D.C. generator is usually made of__________________?
0

A. copper

B. non-ferrous material

C. cast-iron

D. silicon steel

5257. Following D.C. generator will be in a position to build up without any residual magnetism in the poles______________?
0

A. series generator

B. shunt generator

C. self-excited generator

D. compound generator

5258. Open circuited armature coil of a D.C. machine is________________?
0

A. identified by the scarring of the commutator segment to which open circuited coil is connected

B. indicated by a spark completely around the commutator

C. both A. and (b)

D. none of the above

5259. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?
0

A. 640 V

B. 600 V

C. 580 V

D. 620 V

5260. With a D.C. generator which of the following regulation is preferred ?
0

A. 50% regulation

B. 100% regulation

C. infinite regulation

D. 1% regulation

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