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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
Which of the following motor used in hair dryers?

  Synchronous motors.
  Split phase IM.
  Shaded pole IM.
  Cage induction motor.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will become slow.
  It will run in opposite direction.
 It will run in same direction.
 motor will not run.

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 decrease
 either increase or decrease
None of these

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 solid connection.
 none of above.
 commutator.
 slip rings.

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Electrical Machines
The starting resistance of DC motor is generally

 Infinitely large.
 around 500 ohms.
  Low.
 1000 ohms.

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