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Electrical Machines

Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 3000W
 100W
 500W
 1000W

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Electrical Machines
Which of the following motor used in hair dryers?

  Shaded pole IM.
  Synchronous motors.
  Cage induction motor.
  Split phase IM.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.05.
  0.1.
  1.0.
  0.5.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 4.76%.
 2.57 %.
 2.56 %.
 3.76%.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  hysteresis losses.
  eddy current losses.
  ohmic losses.
  mechanical losses.

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in any of above positions.
  along field axis.
  in none of above positions.
  along neutral axis.

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