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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
 low resistivity.
 high viscosity.
  low viscosity.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  Synchronous motor.
  AC slip ring motor.
  DC series motor.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv2.
 Bl2v.
 Bl2v2.
 Blv.

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Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
 Rotational loss
All of these
 Copper loss

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

None of these
 constant V, Tst increases
 constant supply voltage V, starting torque Tst decreases
 either of these

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Electrical Machines
Which type motors are preferred for lathes?

 Squirrel Cage induction motor.
 DC shunt motors.
 Synchronous motor.
 Either A or B.

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