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Electrical Machines

Electrical Machines
From no load to full load the slip will

 slightly decrease.
None of these
 not change.
 slightly increase.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 23.06 kW.
 24.11 kW.
 26.21 kW.
 25 kW.

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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
Oil is provided in an oil filled transformer for

  insulating.
 lubrication.
 cooling.
  both cooling and insulation.

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Electrical Machines
A DC compound motor has

 only shunt field winding.
 both shunt and series field winding.
 tertiary winding.
 only series field winding.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Field control.
 Multiple voltage control.
 Armature control.

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