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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 2000W
 1920W
 1450W
 1820W

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 half.
 4 times.
 double.
 one fourth.

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
  winding conductors and steel structures of transformer.
 steel core.
 transformer insulating oil.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 45°.
  75°.
 0°.
 30°.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 50, 1500.
 60, 1440.
  60, 1500.
 1440, 1500.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 increase starting torque.
  reduce magnetizing current.
 reduce chance of cogging.
 reduce chance of crawling.

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