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Electrical Machines

Electrical Machines
The armature MMF waveform of a DC machine is

  triangular.
  pulsating.
  sinusoidal.
  rectangular.

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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
 1820W
 1450W
 1920W

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Electrical Machines
Maximum power developed depends on

 both 1and 2
 voltage
 reactance
 load angle

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  cage.
  wound.
  none of these.
  linear.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque decreases
 more and maximum torque remains constant
 more and maximum torque decreases
 less and maximum torque increases

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  overheating of winding.
  uneven air gap.
  overload.
  poor lubrication.

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