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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 improve starting torque
 increase pull out torque
 reduce magnetising current and improve power factor
 decrease starting torque

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 Ns
 S.Ns
 Nr

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
 50 V.
  230.2 V.
 399 V.

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 an induction generator
 an induction motor
 a synchronous motor
None of these

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Electrical Machines
Wave winding is prefered for which of the following rating?

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

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