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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.649.
 0.512.
 0.443.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  Synchronous motor.
  DC series motor.
  AC slip ring motor.

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Electrical Machines
An IM cannot run at synchronous speed because

  none of above.
  rotor torque will not be produced.
  air friction will prevent it.
  induction motor will become synchronous motor.

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 20°
 60°
 18°
 30°

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole and compensating windings together
 armature winding
 interpole winding
 field winding

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
 damping winding.
  common winding.
 compensating winding.

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