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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 less than 50%.
 between 50% and 90%.
 more.

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Electrical Machines
Which of the following statements are correct ?

None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.
 The leakage reactance of the induction motor should be small.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 25 W.
 36 W.
 30 W.
 28 W.

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Electrical Machines
Demagnetization effects which of the following?

 commutation
 reduction in main field flux
 reduces the terminal voltage
 both B and C

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 neither the voltage nor the torque
 both the torque and voltage
 voltage but not the torque
 torque but not the voltage

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Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 wave winding
 lap winding
 both 1 and 2

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