Electrical Engineering MCQs

Page No. 277

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


aSeries generator


bShunt generator


cOver compound generator


dFlat compound generator



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


bCompensating field


cInter pole field


dShunt field


View Answer Shunt field

Armature reaction in a generator results in_____________?


ademagnetisation of leading pole tip and magnetisation of trailing pole tip


bdemagnetisation of trailing pole tip and magnetisation of leading pole tip


cdamagnetising the center of all poles


dmagnetising the center of all poles



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


azero


bsmall


cthe same as rated voltage


dhigh


View Answer zero

The purpose of providing dummy coils in a generator is__________________?


a to reduce eddy current losses


bto enhance flux density


cto amplify voltage


dto provide mechanical balance for the rotor



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


azero


babout 2 V


cabout 50 V


d220 V


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


b175 V


c 240 V


d 290 V


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


bwill be of 5 Hz


c will be of 5 xiVHz


dwill be of v Hz 5


View Answer will be of 5 Hz

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


a sinusoidal


b triangular


cpulsating


dflat topped


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


b armature resistance drop


cfield weakening due to armature reaction and armature


dcommutation


View Answer commutation

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