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Electrical Machines

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
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 increasing field excitation.
 shifting the brush axis from GNA to MNA.
  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.

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

 remains unaffected
 decreases
 increases
 any of the above

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  there is no load on the generator.
  the generator runs on full load.
  the generator runs on designed speed.
  the generator runs on overload.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase gradually and then stay at rated voltage
 increase to rated voltage and then may decrease
 remain nearly constant
 decrease

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 decrease
None of these
 increase
 either increase or decrease

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