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Electrical Machines

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

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 dielectric losses.
 stray losses.
 core losses.
 copper losses.

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Electrical Machines
Crawling in an induction motor is due to

  slip ring rotor.
  time harmonics in supply.
  space harmonics produced by winding currents.
  insufficient starting torque.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 zero
 1500 rpm
 1470 rpm
 30 rpm

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 65 V
 115 V
 230 V
 460 V

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Electrical Machines
Synchronous condensers are used to

All of these
 improve the power factor
 reduce hunting
 improve starting torque

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MORE MCQ ON Electrical Machines

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