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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 copper.
 cast iron.
 mica.
  carbon.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

 over commutation.
  too rapid reversal of current.
  any of the above.
  under commutation.

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Electrical Machines
In DC machines shape of net flux density is?

 flat tapped or trapezoidal
 sine wave
 peaky in nature
 saddle shape

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Electrical Machines
Armature of DC machine is made of

 insulating material.
 silicon steel.
 non-ferrous material.
 conducting material.

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 series generator
 differentially compounded generator
 shunt generator
 cumulatively compounded generator

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
 I1 = KI2.
 I1 = KI2 + Iw.
  I1 = KI2 + Iw + Iμ.ok

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