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Electrical Machines
Armature reaction in DC generators will result in
reduction in generated emf.
open circuit.
increase in slip.
short circuit.
reduction in generated emf.
open circuit.
increase in slip.
short circuit.
Answer
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Related Question
Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?
Field resistance control.
Armature voltage control.
Any of above.
Armature circuit resistance control.
Field resistance control.
Armature voltage control.
Any of above.
Armature circuit resistance control.
Answer
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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be
1.4 mWb.
1.2 mWb.
2.7 mWb.
3.5 mWb.
1.4 mWb.
1.2 mWb.
2.7 mWb.
3.5 mWb.
Answer
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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?
Cumulative compound motor.
Shunt motor.
Series motor.
Differential compound motor.
Cumulative compound motor.
Shunt motor.
Series motor.
Differential compound motor.
Answer
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Electrical Machines
A smaller air gap in a polyphase induction motor helps to
reduce the chance of crawling.
increase the starting torque.
reduce the magnetizing current.
reduce the chance of cogging.
reduce the chance of crawling.
increase the starting torque.
reduce the magnetizing current.
reduce the chance of cogging.
Answer
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Electrical Machines
Hopkinson test is conducted under which of the following condition?
any of the above
half load
no load
full load
any of the above
half load
no load
full load
Answer
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