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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
 0.7.
  1.
  0.54.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 3000 rpm
 1000 rpm
 1500 rpm
 750 rpm

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  delta connection.
  V connection.
  star connection.
  zig - zag connection.

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

 four.
 two.
 six.
 three.

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 cast iron.
 silicon steel.
 carbon.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 All of these.
 Field flux.
 Armature current.
 Applied voltage.

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