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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

 1.0.
 2 to 3.
  1.5 to 2.
 3 to 5.

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Electrical Machines
The output voltage of a DC generator is

 E = V – IaRa.
 E = V + Ra.
 E = V + Ia.
  E = V + IaRa.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 950 rpm
 1000 rpm
 940 rpm

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BYR
All of these
 BRY
 RBY

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 20V
 200V
 100V

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
  speed and voltage.
 speed.
  load.

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