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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Very low.
 Very high.
 Normal.

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1/S
 1-S
 1/(1-S)

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 supply frequency
 both 2 and 3
 load current
 maximum flux density

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Electrical Machines
Demagnetization effects which of the following?

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

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Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Shaded pole
 Capacitor run
 Capacitor start

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Electrical Machines
Rotor resistance speed control is used in

 dc shunt motor.
 synchronous motor.
 squirrel cage induction motor.
 slip ring induction motor.

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