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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 24
 10
 5
 12

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Electrical Machines
Which type of motors are used for lathes?

 DC shunt motors.
 Synchronous motor.
 Either A or B.
 Cage induction motor.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  an integral multiple of number of rotor slots.
  equal to number of rotor slots.
  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thick
 large and thin

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Electrical Machines
The DC compound motors are generally

 Cummulative compound.
 None of these.
 Level Compound.
 Differentical compound.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/2.
 PN/120.
 PN/3000.
 PN/60.

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