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Electrical Machines

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

 0.7.
  0.54.
 0.3.
  1.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  zero.
 1.5 %.
  less than 1 %.
 4 %.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 2
 3 or 4
 1

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Electrical Machines
Induction motors provided with open slots have

  leading power factor.
  higher efficiency.
  more breakdown torque.
  less breakdown torque.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

  Series.
 None of the options.
 Compound.
 Parallel.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor mmf wave.
  Rotor winding.
  Stator winding.
  Both rotor and stator winding.

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