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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 30.
 180.
 45.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the motor will come to stop.
 the motor will attain dangerously high speed.
 the armature current will reduce.

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
 starting torque equal to full-load torque.
 high starting torque.
  zero starting torque.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I and P/2
 V, I/2 and P/2
 V, I and P
 V/2, I/2 and P/4

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Electrical Machines
Dummy coils are used for

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

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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?

 60%
 40%
 38%
 68%

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