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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Thickness
 Flux density
All of these
 Frequency

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 infinity.
  unity.
 two.
 zero.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of input to output voltage.
  ratio of starting to running current.
  ratio of starting to running torque.
  efficiency.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4S
 PZL/4Sp²
 PZL/4Sa²
 PZL/ 4Sa

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 3, 4
 1, 2, 5
 1, 3, 5
 2, 3, 4

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 not possible
 some what less than 230 V
 230 V
 some what more than 230 V

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