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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  1.
  0.54.
 0.3.
 0.7.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 C - A - B.
 B - C - A.
 B - C - A or C - A - B.
  A - C - B.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 line to line fault.
  line to ground fault.
 3 - phase to ground fault.
 3 - phase fault.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 75 W
 50 W
 168.75 W
 112.5 W

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Electrical Machines
Commutator in DC generator is used for

 reduce losses
 collecting of current
 convert AC armature current in to DC
 increase efficiency

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.04
 0.2
 0.4

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