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Electrical Machines

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

 20 ppm.
 25 ppm.
  35 ppm.
 45 ppm.

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 both A and B
 variable loss
None of these
 constant loss

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 any of the above
 remains unaffected
 increases
 decreases

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.25.
 Greater than 1.
 0.5.
 near to 1.

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Electrical Machines
Armature reaction in DC generators will result in

 short circuit.
 increase in slip.
 open circuit.
 reduction in generated emf.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 decrease.
 increase
 remain the same.
 be unpredictable.

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