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ELECTRICAL MACHINES

Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC shunt motor with armature resistance control.
 DC series motor.
 DC compound motor.

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Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
 DC shunt.
 Induction motor.
  DC series.

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

  PSC (permanent split capacitor) motor.
 Split phase motor.
None of these
 Shaded pole motor.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  15 N.
  None of these.
  Can't be determined.
 20 N.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
  1.5 to 2.
 2 to 3.
 3 to 5.

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