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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?

 1920W
 2000W
 1450W
 1820W

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  zero.
  very small, say about 2 or 3 V.
 about 100 V.
  250 V.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 16/9.
 4/3.
 9/16.
 3/4.

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 air velocity.
 temperature difference.
 surface area.
  color of the paint.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 decrease
 remain nearly constant
 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ 1/V²
 T ∝ V
 T ∝ 1/V

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