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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
None of these
 decrease
 increase

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra maximum and Rf minimum
 Rf maximum and Ra minimum
 Ra maximum and Rf maximum
 Ra minimum and Rf minimum

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the maintenance and repair
 increases the design cost
 increase the iron loss
All of these

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Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Mild steel.
 Silicon steel.
 Fibre.

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  both.
  larger bore diameter.
  larger output.
  none.

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Electrical Machines
Universal motors are used in

 food processing
 traction
 cranes
All of these

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