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Electrical Machines

Electrical Machines
Lamination of transformer core is made of

  silicon steel.
 cast steel.
  cast iron.
 wrought iron.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with field weaking control.
 DC shunt motor with armature resistance.
 DC compound motor.
 DC series motor.

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Electrical Machines
Slip exists in

  none of above.
  in both machines.
  synchronous motor.
  induction motor.

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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.

 0.512.
  0.573.
 0.443.
 0.649.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 16KVA
 0KVA
 4KVA

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
None of these
 DC series motors.
 DC shunt motors.

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