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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

  2 pole.
 8 pole.
 4 pole.
 6 pole.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 the use drum winding.
 reactance voltage produced due to communication.
 the use of compensating winding.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 301 A, secondary = 22.7 A
 primary = 602 A, secondary = 22.7 A
 primary = 11.4 A, secondary = 301 A
 primary = 22.7 A, secondary = 602.4 A

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Electrical Machines
The armature shaft must be able to withstand

 bending moment due to weight of the armature.
All of these
 any unbalanced magnetic pull on the armature core.
 twisting strains due to transmission of torque.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always closed.
  always opened.
  none.
  semi closed or semi opened.

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Electrical Machines
The shaft of induction motor should be

  any of these.
  stiff.
  flexible.
  hollow.

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