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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

 700 W
 625 W
 600 W
 650 W

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Capacitor run
 Resistance split phase
 Capacitor start
 Shaded pole

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KVA.
 Gross power.
 Output power at the shaft.
 Power drawn in KW.

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

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

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  only armature terminals are reversed.
  none of above.
  either field terminals are reversed or armature terminals are reversed.
  only field terminals are changed.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 remain unchanged.
 reduce by 5 %.
 increase by 5 %.
 depend on other factors.

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