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Electrical Machines

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

  1.5 to 2.
 2 to 3.
 1.0.
 3 to 5.

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Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 DC machine
 Induction machine
All of these

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Electrical Machines
What are the starters used for starting of cage motors?

 Star-delta starter.
 Auto transformer starter.
 DOL starter.
  All of these.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 2 point starter
 3 point starter
All of these
 4 point starter

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
 Gross power.
 Power drawn in KVA.
  Output power at the shaft.

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  sinusoidal.
  flat topped.
  pulsating.
 triangular.

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