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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 0
 infinite value
 1
 finite value

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Electrical Machines
The direction of rotation of a DC motor can be determent by

  Flemings left hand rule.
 Amperes law.
 Flemings right hand rule.
 Lenzs law.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Double cage motor.
  Synchronous motor.
  Squirrel cage IM.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 30 volts.
 20 volts.
 10 volts.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 65 V
 230 V
 460 V
 115 V

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 closed winding
 lap winding
 wave winding
 open type winding

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