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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 94%
 92%
 96%

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 machine B
 machine A
 none of these
 any of the two machines

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Electrical Machines
Which of the following generators are used in arc welding?

 differential compound generators
 series generators
 shunt generators
 cumulative compound generators

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Electrical Machines
In shapers and slotters which motor are preferred?

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

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Electrical Machines
The three point starter is used for

  Shunt, compound and series motor.
  Series motor.
  Shunt motor.
  Shunt motor as well as compound motors.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces generator emf.
  reduces inter poles flux density.
  results in sparking trouble.
  increases armature speed.

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