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Electrical Machines

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

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

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Cast iron bearings.
None of these
  Bush bearings.
  Ball bearings.

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

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

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

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 50Ω
 10Ω
 100Ω
 200Ω

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 MNA
 either GNA or MNA
None of these

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