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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 copper.
 mica.
 cast iron.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 reduce slightly.
 increase proportional.
 increased slightly.
 remains constant.

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

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

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole and compensating windings together
 interpole winding
 armature winding
 field winding

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC Shunt motor.
 DC compound motor.
 DC series motor.

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
 dynamically induced emf.
None of these
 dynamically and statically induced emf.

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