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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 copper.
 mica.
  carbon.
 cast iron.

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Gross power.
  Output power at the shaft.
 Power drawn in KW.
 Power drawn in KVA.

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

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

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

None of these
 Shaded pole motor.
  PSC (permanent split capacitor) motor.
 Split phase motor.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get more flux.
 In order to not to get saturated.
 In order to get saturated.
All of these

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Induced emf.
 Can not be determined.
 Armature current.
 Mechanical power.

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