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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

None of these
 below rated speed
 above rated speed
 both A and B

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Electrical Machines
Which type of motors are used for lathes?

 Synchronous motor.
 Either A or B.
 DC shunt motors.
 Cage induction motor.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

  condition of paper insulation in transformer.
 condition of oil in transformer.
 condition of cork gaskets used in transformer.
 condition of lamination on CRGO steel sheet.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
 none of these.
  Shunt.
 Compound (cummolative).

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  delta connection.
  star connection.
  zig - zag connection.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P*ωm
 ωe = ωm
 ωe = P/2*ωm
 ωe = 2/P*ωm

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