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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
 high viscosity.
 low BDV.
  low viscosity.

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

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

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 36°
 72°
 18°

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Increasing the field current.
 Decreasing the field current.
 Increasing the armature current.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3%
 +3%
 +3.33%
 -3.33%

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 16.55 Nm
 15.28 Nm
 15.6 Nm
 Zero

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