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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

 2 to 3.
  1.5 to 2.
 3 to 5.
 1.0.

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as square of applied voltage
None of these
 directly as applied voltage
 inversely as applied voltage

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

None of these
 increase
 decrease
 either increase or decrease

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 60°
 45°
 10°

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
 6.
  8.
  2.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  Closed slots.
  None of above.
  Open slots.

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