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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 copper loss
 iron loss
 mechanical loss

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  0.65 Hz.
 0.75 Hz.
 0.70 Hz.
  60 Hz.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 2500 W
 3200 W and 5200 W
 1600 W and 5000 W
 1600 W and 1250 W

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Electrical Machines
Induction motor operation depends on

 stationary magnetic field.
 either of these.
 rotating magnetic field.
None of these

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor field terminal.
 generator armature terminal.
 generator field terminal.
 motor armature terminal.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Glass.
  Vacuum.
  Mica.
  Oil impregnated paper.

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