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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  1.
  0.54.
 0.7.

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Electrical Machines
Which of the following motors is/are widely used?

 either of these
None of these
 slip ring induction motor
 squirrel cage induction motor

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 depend on other factors.
 remain unchanged.
 reduce by 5 %.
 increase by 5 %.

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Electrical Machines
Which of the following pairs is/are correct?

All of these
 closed slot----- leakage flux is high
 semi closed slot-----leakage flux is moderate
 open slot----- leakage flux is less

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Electrical Machines
Drop in speed from no load to full load is very high in

  Series motor without interpoles.
 Series motor with interpoles.
 Cummulative compound motor with interpoles.
 Shunt motor with interpoles.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 per unit impedance
 ratings
 leakage reactance
 efficiency

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