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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 either increase or decrease
 decrease
 increase
None of these

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Electrical Machines
Which of the following represents the rotating losses of machine?

 All of the them
 Hysteresis losses
 Eddy current losses
 Friction and windage losses

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on designed speed.
  there is no load on the generator.
  the generator runs on overload.
  the generator runs on full load.

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Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 0.5 lagging
 R = S.X
 zero
 unity

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

 25 ppm.
  35 ppm.
 45 ppm.
 20 ppm.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
  Full load.
 No load.
 Low load.

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