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Electrical Machines

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 2000.
 1000.
 0.
 500.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Oscillates around the rated speed.
  Decreases.
 Remains unchanged.
 Increases.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 kept constant to certain value.
  increased.
 decreased.
 remains same.

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Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 flux(φ)
 both A and B
 armature current(Ia)

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply frequency
None of these
 rotor resistance
 supply voltage

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

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

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