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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 50%
 57.7%
 33.3%
 66.3%

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Synchronous motor.
 DC shunt motor.
 Reluctance motor.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

 shunt connected.
  deferentially compounded.
  series connected.
  cumulatively compounded.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 economise on the material required for interpoles and their windings
 reduce the saturation in the interpole
 increase the acceleration of commutation
 reduce the overall weight

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 266.20 N-m.
 can not be determined.
 133.22 N-m
 234.76 N-m.

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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?

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

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