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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 √3
 1/√3
 1/3

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will become slow.
 armature will oscillate about original speed as the mean speed
 armature current will drop
 motor will attain dangerously high speed

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

  convection.
All of these
 conduction.
 radiation.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Eddy current losses
 Copper losses
 Both 1 and 2

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Electrical Machines
Armature reaction in DC generators will result in

 open circuit.
 short circuit.
 reduction in generated emf.
 increase in slip.

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral pole.
  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic neutral pole.

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