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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
 Induction motor.
  DC series.
 DC shunt.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 armature winding
 interpole and compensating windings together
 field winding
 interpole winding

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 rating of generators should be same.
 polarities should be same.
 both A and B.
 terminal voltage should be same.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 230 V.
 225 V.
 220 V.
  222 V.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 both 1 and 2
 power due to saliency or reluctance only
 excitation power only
None of these

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 80W
 60W
 40W
 100W

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