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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 full load
 half load
 no load

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 core loss only
 both 1 and 2
 windage and friction loss
 Copper loss

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce the eddy currents.
  provide starting torque only.
  prevent hunting and provide the starting torque.
  reduce noise level only.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 interchanging the capacitor from starting winding to main winding or vice versa.
All of these
 reversing the terminals of starting winding.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 2.5Hz
 50Hz
 1 Hz

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 4/P*θmech
 θelec = P/2*θmech
 θelec = θmech
 θelec = 2/P*θmech

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