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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - delta
 Star - delta
 Delta - star

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage, frequency and load
 supply voltage and frequency
 supply voltage and load
 supply voltage

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 60 Hz
 50 Hz
 40 HZ

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Electrical Machines
Dynamic braking can be used for

All of these
 shunt motors.
 compound motors.
 series motors.

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 applied voltage.
 resistance of armature culture.
 all of these.

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

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

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