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Electrical Machines

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

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 2*ωm
 ωe = ωm
 ωe = 4*ωm
 ωe = 1/2*ωm

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Delta side leads by 30°.
 Star side lags by -30°.
 Star side leads by 30°.
  Delta side lags by -30°.

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increases the design cost
 increase the iron loss
All of these
 increase the maintenance and repair

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 19%
 5%
 40%

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and underecited
 lightly loaded and over excited
 heavily loaded and over excited
 heavily loaded and underexcited

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