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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 850 rpm
 1000 rpm
 950 rpm
 900 rpm

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 back to back test
None of these
 OC and SC tests
 load test

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Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
 tertiary winding.
  common winding.
 damping winding.

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Electrical Machines
Lap winding is prefered for which type of machines?

 low current and low voltage
 high current and high voltage
 low current and high voltage
 high current and low voltage

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Electrical Machines
Which of the following rotor requires damper winding?

 Both type rotor.
 Cylindrical rotor.
 Salient pole rotor.
None of these

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Shaded pole
 Resistance split phase
 Capacitor run

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