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Electrical Machines

Electrical Machines
In escalator which motor is used?

  Universal motor.
  1 - φ IM.
  DC shunt motor.
  3 - φ IM.

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2
 (E2 - V2) / E2

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Shunt motor.
  Series motor.
  Differential compound motor.
  Cumulative compound motor.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Any where between 75 % and 90 %.
 Less than 50 %
 Around 100 %.
 Around 90 %

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Interchanging armature and field connection.
 Reversing supply connection.
 Reversing armature connection or field connection.
 Adding resistance to field circuit.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, unshaded
 unshaded, shaded
 shaded, shaded
 shaded, unshaded

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