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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and high
 high and low
 low and high
 low and low

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Electrical Machines
Dummy coils are used for

 increasing efficiency.
 mechanical balancing.
 reducing armature reaction.
All of these

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 2
 4
 1

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 68%
 60%
 38%
 40%

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 74 Nm.
 38.5 Nm.
  65.8 Nm.
 27.73 Nm .

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

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