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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 copper alloy
 hard-drawn copper
 brass
 copper

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

All of these
 conduction.
  convection.
 radiation.

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Electrical Machines
Commutators in DC machines have a role of which converts

 AC to DC.
 none of these.
 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.

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

 increase
 decrease
 either increase or decrease
None of these

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 not start automatically.
 start automatically without trouble.
 develop very low starting torque.
 get damaged.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Oil impregnated paper.
  Vacuum.
  Glass.
  Mica.

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