electrical engineering MCQs – Page 262

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 Review each marked answer and report any item that may be outdated or unclear.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

5221. The commutator segments are connected to the armature conductors by means of___________?
0

A. copper lugs

B. insulation pads

C. brazing

D. resistance wires

5222. While applying Flemings right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?
0

A. direction of flux

B. direction of motion of the conductor if forefinger points in the direction of generated e.m.f.

C. direction of motion of conductor, if forefinger points along the lines of flux

D. direction of induced e.m.f.

5223. In D.C. generators, the brushes on commutator remain in contact with conductors which_________________?
0

A. lie under interpolar region

B. are farthest from the poles

C. lie under south pole

D. lie under north pole

5224. A shunt generator can self-excite:_________________?
0

A. none

B. irrespective of the value of the resistance in the field circuit

C. only if the resistance of the field circuit is greater than critical value

D. only if the resistance of the field circuit is less than critical value

5225. D.C. generators are connected to the busbars or disconnected from them only under the floating condition________________?
0

A. to avoid mechanicaljerk to the shaft

B. all above

C. to avoid burning of switch contacts

D. to avoid sudden loading of the primemover

5226. In D.C. generators on no-load, the air gap flux distribution in space is______________?
0

A. triangular

B. pulsating

C. sinusoidal

D. flat topped

5227. Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________?
0

A. 257.4 V

B. 270 V

C. 265 V

D. 267.5 V

5228. Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be_______________?
0

A. 3 : 1

B. 2:03

C. 1:03

D. 3:02

5229. If a D.C. generator fails to build up the probable cause could not be_____________?
0

A. no residual magnetism in the generator

B. field resistance less than the critical resistance

C. imperfect brush contact

D. faulty shunt connections tending to reduce the residual magnetism

5230. Laminations of core are generally made of________________?
0

A. stainless steel

B. case iron

C. carbon

D. silicon steel

5231. In a D.C. generator the critical resistance refers to the resistance of_____________?
0

A. field

B. load

C. brushes

D. armature

5232. The critical resistance of the D.C. generator is the resistance of_____________?
0

A. field

B. load

C. armature

D. brushes

5233. The function of pole shoes in the case of D.C. machine is______________?
0

A. to spread out the flux to achieve uniform flux density

B. to support the field coil

C. to discharge all the above functions

D. to reduce the reluctance of the magnetic path

5234. In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called____________?
0

A. armature

B. stator

C. rotor

D. field

5235. Equilizer rings are required in case armature is_______________?
0

A. lap wound

B. wave wound

C. delta wound

D. duplex wound

5236. A separately excited generator as compared to a self-excited generator_____________?
0

A. is amenable to better voltage control

B. is more stable

C. has exciting current independent of load current

D. has all above features

5237. When two D.C. generators are running in parallel an equilizer bar is used______________?
0

A. to increase the series flux

B. to increase the generated e.m.f.

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

D. so that the two identical machines will pass approximately equal currents to the load

5238. In case of a flat compounded generator:
0

A. voltage remains constant irrespective of the load

B. speed varies in proportion to the load on the generator

C. voltage generated is less than the rated voltage

D. generated voltage is proportional to the load on the generator

5239. The following constitute short-circuit in the armature winding.
0

A. Insulation failure between two turns of a coil

B. Insulation failure between two commutator bars

C. All of the above

D. Two of more turns of the same coil getting grounded

5240. The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________?
0

A. 8

B. 2

C. 6

D. 4

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