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Electrical Machines

Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 any of the above
 0
 1
 0.5

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1000 rpm
 1500 rpm
 zero speed
 750rpm

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 8.
 32.
 16.
  4.

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Electrical Machines
A smaller air gap in a induction motor helps to

 increase the starting torque.
 reduce the magnetizing current.
 reduce the chance of crawling.
 reduce the chance of cogging.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  greater than one.
  very low
  approx to one.
  less than one.

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 provide overload protection.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.

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