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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 1 - s.
 2 + s.
  s.
  2 - s.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 no load
 any of the above
 full load
 half load

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these
 DC.
 AC.
 both of above.

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Electrical Machines
The induction motor shaft is made of

  cast iron.
  mild steel.
  aluminium.
  stainless steel.

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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, 3, 5
 1, 2, 3, 4
 1, 2, 5
 2, 3, 4

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 remains unaffected
 increases
 decreases
 any of the above

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