MCQs 1: In over compounded generator, full load terminal voltage is______________?
almost zero
less than no load terminal voltage
more than no load terminal voltage
equal to no-load terminal voltage
MCQs 2: In D.C. generators the polarity of the interpoles_____________?
is the same as that of the main pole ahead
is the same as that of the immediately preceding pole
is opposite to that of the main pole ahead
is neutral as these poles do not play part in generating e.m.f.
MCQs 3: The e.m.f. generated in a D.C. generator is directly proportional to____________?
MCQs 4: In a level compounded D.C. generator, full load terminal voltage is______________?
negligibly low
equal to no-load terminal voltage
more than no-load terminal voltage
less than no-load terminal voltage
MCQs 5: In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when_______________?
there is no load on|he generator
the generator runs on full load
the generator runs on overload
the generator runs on designed speed
MCQs 6: In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except______________?
MCQs 7: The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except:_____________?
armature reaction
armature resistance drop
field weakening due to armature reaction and armature
commutation
MCQs 8: In D.C. generators on no-load, the air gap flux distribution in space is______________?
MCQs 9: The purpose of providing dummy coils in a generator is____________?
to reduce eddy current losses
to enhance flux density
to amplify voltage
to provide mechanical balance for the rotor
MCQs 10: A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will_____________?
MCQs 11: 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_______________?
MCQs 12: A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be_____________?
MCQs 13: The purpose of providing dummy coils in a generator is__________________?
to reduce eddy current losses
to enhance flux density
to amplify voltage
to provide mechanical balance for the rotor
MCQs 14: If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________?
MCQs 15: Armature reaction in a generator results in_____________?
demagnetisation of leading pole tip and magnetisation of trailing pole tip
demagnetisation of trailing pole tip and magnetisation of leading pole tip
damagnetising the center of all poles
magnetising the center of all poles
MCQs 16: 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.
MCQs 17: Which generator would you prefer for feeding long D.C. transmission lines ?
MCQs 18: In a D.C. generator the critical resistance can be increased by_____________?
increasing its field resistance
decreasing its field resistance
increasing its speed
decreasing its speed
MCQs 19: In a D.C. generator:___________________?
external resistance = internal char-acteristic – armature reaction
internal characteristic = magnetisation characteristic – ohmic drop
external characteristic = magnetisation characteristic – ohmic drop – armature reaction
magnetisation characteristic = external characteristic
MCQs 20: The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________?
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