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Electrical Machines

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

 peaky in nature
 flat tapped or trapezoidal
 sine wave
 saddle shape

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Electrical Machines
Armature of DC machine is made of

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

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

  Mica.
  Oil impregnated paper.
  Glass.
  Vacuum.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 600 A.
  3600 A.
 1200 A.
 2400 A.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 65 V
 460 V
 230 V
 115 V

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara
 Vt = Ea + Iara+ ILrs
 Vt= Ea– Iara

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