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Electrical Machines

Electrical Machines
Slip exists in

  in both machines.
  synchronous motor.
  none of above.
  induction motor.

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Electrical Machines
Which of the following alternators contain large number of poles?

None of these
 Hydro alternators.
 Turbo alternators.
 Aame in both alternators.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 45°.
  load angle is equal to internal angle θ.
  load angle is 0°.
  input power factor is unity.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  negative sequence current.
  less heating of the rotor.
  all of these.
  less heating of the rotor.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Open slot type machines.
 Semi closed slot type machine.
 Any of the above.
 Closed slot type machines.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  none of above.
  only field terminals are changed.
  either field terminals are reversed or armature terminals are reversed.
  only armature terminals are reversed.

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