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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  synchronous motor.
  capacitor start induction motor.
  repulsion start induction motor.

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Electrical Machines
Lamination of transformer core is made of

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

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 below rated speed
 both A and B
None of these

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load torque.
 None of these.
  Full load current.
 Full load speed.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 44.47 Amp.
  33.33 Amp.
 29 Amp.
  43 Amp.

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