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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?

 80W
 100W
 60W
 40W

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 reduced starting current.
 more starting torque.
 more starting time.
 smoother acceleration.

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Electrical Machines
Maximum power developed depends on

 voltage
 both 1and 2
 reactance
 load angle

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Electrical Machines
High starting torque and low starting current is the advantage of

  stepper motor.
  slip ring induction motor.
  hysteresis motor.
  squirrel cage induction motor.

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 33.3%
 66.3%
 57.7%
 50%

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Electrical Machines
A shaded pole single phase induction motor can be used for

 personal computers as cooling fan
 food mixers
 tape recorders
 wet grinders

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