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Electrical Machines

Electrical Machines
In single phase rotary converter the number of slip rings will be

 two.
 four.
 three.
 six.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 dielectric losses.
 stray losses.
 core losses.
 copper losses.

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

  linear.
  wound.
  cage.
  none of these.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 1000 rpm
 2000 rpm
 500 rpm

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 50%
 57.7%
 66.3%
 33.3%

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Electrical Machines
Which type of motors are used for lathes?

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

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