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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 speed.
 power.
 torque.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate and the speed rises.
 improve and the speed rises.
 improve and the speed falls.
 deteriorate and the speed falls.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0
 0.5
 any of the above
 1

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Electrical Machines
Crawling in an induction motor is due to

  time harmonics in supply.
  space harmonics produced by winding currents.
  insufficient starting torque.
  slip ring rotor.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  shunt connected.
  cumulatively compounded.
  separately excited.
 differentially compounded.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 mechanical rotatory system.
 synchronizing power co efficient.
 damping torque.
  restoring torque.

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