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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?

 60W
 40W
 100W
 80W

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Electrical Machines
Regenerative braking is not found in which motor?

  DC series.
 DC shunt.
 Induction motor.
 DC compound.

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Electrical Machines
_____________ types of induction motor are widely used.

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

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

  to suppress harmonic and unbalance in voltage.
None of these
 to carry extra load.
 to interconnect three voltage systems.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

  clearance between tips of the adjacent pole shoes.
  all of above.
  shape of the pole shoe.
 size of air gap.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

None of these
 either of these.
 increase.
 decrease.

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