Electrical Engineering MCQs

Page No. 277

Which generator would you prefer for feeding long D.C. transmission lines ?


aSeries generator

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bShunt generator

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cOver compound generator

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dFlat compound generator

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Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.


aSeries field

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bCompensating field

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cInter pole field

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dShunt field

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View Answer Shunt field

Armature reaction in a generator results in_____________?


ademagnetisation of leading pole tip and magnetisation of trailing pole tip

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bdemagnetisation of trailing pole tip and magnetisation of leading pole tip

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cdamagnetising the center of all poles

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dmagnetising the center of all poles

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


azero

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bsmall

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cthe same as rated voltage

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dhigh

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View Answer zero

The purpose of providing dummy coils in a generator is__________________?


a to reduce eddy current losses

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bto enhance flux density

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cto amplify voltage

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dto provide mechanical balance for the rotor

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A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be_____________?


azero

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babout 2 V

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cabout 50 V

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d220 V

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View Answer about 2 V

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly_______________?


a150 V

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b175 V

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c 240 V

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d 290 V

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View Answer 240 V

A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will_____________?


awill be zero

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bwill be of 5 Hz

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c will be of 5 xiVHz

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dwill be of v Hz 5

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View Answer will be of 5 Hz

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


a sinusoidal

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b triangular

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cpulsating

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dflat topped

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View Answer flat topped

The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except:_____________?


a armature reaction

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b armature resistance drop

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cfield weakening due to armature reaction and armature

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dcommutation

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View Answer commutation

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