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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  stator frame.
  rotor shaft.
None of these
  pole faces.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both increase
 both decrease
 decrease and increase respectively
 increase and decrease respectively

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Hysteresis motor.
 Reluctance motor.
  Stepper motor.
 Shaded pole motor.

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

None of these
 I1 = I2
 I1 > I2
 I1 < I2

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

 either GNA or MNA
 MNA
 GNA
None of these

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high field resistance.
  high speed.
  residual flux.
  magnetic inertia.

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