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Electrical Machines

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?

 100W
 60W
 80W
 40W

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Electrical Machines
Field weakening method is also called as-----------?

 constant voltage control
 constant current control
 constant torque control
 constant power control

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Electrical Machines
_____________ types of induction motor are widely used.

  Squirrel cage IM.
  Three phase IM.
  Single phase IM.
  Slip ring IM.

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Electrical Machines
In DC machines shape of net flux density is?

 flat tapped or trapezoidal
 saddle shape
 peaky in nature
 sine wave

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Electrical Machines
The ventilating ducts in most of DC machine are

 radial as well as longitudinal.
 longitudinal.
 radial.
 none of these.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the load.
 varying the speed.
 changing the field excitation.
 varying the applied voltage.

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