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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 1 V
 0 V
 4 V

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

  18.
 80.
 36.
 50.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 460 V
 115 V
 200 V
 230 V

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt motor.
  DC series generator.
  DC series motor.
 DC shunt generator.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 rotor of a dc machine.
 stator of a dc machine.
 stator of a induction machine.

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Electrical Machines
Transformer action requires a

 constant magnetic flux.
 alternating magnetic lux.
 increasing magnetic flux.
 alternating electric flux.

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