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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P.
  Z.
  none of these.
  P and Z.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  equal to number of rotor slots.
  either (B) or (C).
  unequal to number of rotor slots and skewed in shape.
  an integral multiple of number of rotor slots.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 25 W.
 28 W.
 30 W.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Shaded pole motor.
 Hysteresis motor.
 Reluctance motor.
  Stepper motor.

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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?

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

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I and P
 V/2, I/2 and P/4
 V, I/2 and P/2
 V/2, I and P/2

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