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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 20 ppm.
 45 ppm.
 25 ppm.

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ia.
 E = V + Ra.
  E = V + IaRa.
 E = V – IaRa.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Eddy current losses
 Both 1 and 2
 Copper losses

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 varying the applied voltage.
 changing the load.
 varying the speed.
 changing the field excitation.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
None of these
 rotor resistance R
 both 1 and 2

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

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

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