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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imax.
 Vmax to Imin.
 Vmax to Imax.
 Vmin to Imin.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 3000 rpm
 4000 rpm
 1000 rpm
 1500 rpm

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Electrical Machines
DC generator will not build up voltage

 if field resistance is more than critical resistance.
 due to wrong direction of rotation.
 any one of above.
  if it has lost residual magnetism.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.25Ω.
 1Ω.
  0.23Ω.
 0.5Ω.

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Electrical Machines
The commutator segments of DC machines are made up of

 copper alloy
 copper
 hard-drawn copper
 brass

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
  It will becomes four times.
 It will remain the same.
  It will be halved.

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