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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 74
 72
 37
 36

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 between zero and infinity.
 remain unchanged.
 aprroach infinity.
 approach zero.

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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/120.
 PN/3000.
 PN/2.
 PN/60.

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Electrical Machines
The DC compound motors are generally

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

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Electrical Machines
Which type of motors are used for lathes?

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

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  single phase winding.
  heavy copper or aluminium bars placed in rotor slots.
  heavy short-circuited end rings.
  three phase winding.

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