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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 MNA
 GNA
 either GNA or MNA

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 high and high
 high and low
 low and low

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = 2/P*ωm
 ωe = P/2*ωm
 ωe = P*ωm
 ωe = ωm

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

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  running the motor on leading power factors.
  maintaining constant excitation.
  oscillation cannot be damped.
  providing damper bars in the rotor pole faces.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 1000 rpm
 500 rpm
 2000 rpm
 250 rpm

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MORE MCQ ON Electrical Machines

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