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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 both A and B
 copper loss
 mechanical loss

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

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

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Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 Induction machine
 DC machine
All of these

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Electrical Machines
In DC machine torque depends on which of the following?

 armature current (I)
 flux (φ)
 speed
 both A and B

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Same in both induction motors.
 Squirrel cage induction motor.
None of these
 Slip ring induction motor.

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Electrical Machines
Which of these types of motor is self starting?

  Poly-phase induction motor.
  Poly-phase synchronous machine.
  Single phase induction motor.
  None of these.

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