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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 600 W
 650 W
 700 W

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²
 PZL/4Sp²

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 100 ohm
 0.2 ohm
 2 ohm.
 10 ohm

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Electrical Machines
DC machine windings are

 either of these
None of these
 short pitched
 full pitched

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as wide as possible.
  depends on the material of stator and the rotor.
  air gap does not matter.
  as small as possible.

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Electrical Machines
Capacitor in split phase induction motor is used to

 reduce the harmonics.
 improve the starting torque.
 improve the power factor.
 start the motor.

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