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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 90o.
 dependent upon the load.
 180o.

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 a synchronous motor
 an induction motor
None of these
 an induction generator

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

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

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 950 rpm
 900 rpm
 850 rpm
 1000 rpm

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Electrical Machines
Which of the following motors is/are widely used?

None of these
 squirrel cage induction motor
 either of these
 slip ring induction motor

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Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  phosphor bronze.
  carbon.
  aluminium.

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MORE MCQ ON Electrical Machines

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