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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

None of these
 reversing drive
 both 1 and 2
 non reversing drive

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Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
  insulating.
 cooling.
 lubrication.

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 no load
 half load
 full load

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Electrical Machines
The reduced air gap results in an increase

  cost of operation.
  starting torque.
  breaking torque.
  power factor.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 6 V
 zero
 more than 6 V

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.05.
  0.905.
 20.
 1.1.

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