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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Coupling mounted on the shaft.
 Field.
 Armature.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 opposite to the direction of motion of the conductor.
 direction of flux.
 direction of induced emf.
 direction of motion of the conductor.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 unity.
 leading.
 zero.
  lagging.

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Electrical Machines
Example of double excited machine is

None of these
 DC Shunt Motor
 Both are correct.
 Synchronous motor.

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

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

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Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 choke.
 generator.
 transformer.

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MORE MCQ ON Electrical Machines

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