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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 32°C.
 27°C.
  45°C.
 35°C.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing number of poles.
  speed can not be increased.
  increasing of frequency.
  decreasing of frequency.

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

None of these
  to suppress harmonic and unbalance in voltage.
 to carry extra load.
 to interconnect three voltage systems.

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

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

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 3 to 5.
 1.0.
 2 to 3.

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and low reactance.
  low resistance and high reactance.
  low resistance and low reactance.
  high resistance and high reactance.

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MORE MCQ ON Electrical Machines

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