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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 650 W
 700 W
 600 W

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature midway between poles.
 commutator in the inter polar axis.
 commutator in the polar axis.
 armature in the polar axis.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Starting torque, operating speed, full load current.
 Starting torque.
 Operating speed.
  Full load current.

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Electrical Machines
Rotating part of DC motor is known as

 Pole.
 Starter.
 Carbone brush.
 Armature.

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Electrical Machines
Counter emf of a DC motor

 helps in energy conversion.
 aids applied voltage.
 exceeds supply voltage
 regulates its armature voltage.

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Electrical Machines
Which of the following is not a part of transformer?

  Commutator.
 Radiator.
 Tap changer.
 Conservator tank.

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