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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  both A and B.
  star delta.
None of these
  DOL.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 any of the above.
 greater than the primary.
 equal to primary.
 less than primary.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 be unpredictable.
 increase
 remain the same.
 decrease.

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Electrical Machines
Satisfactory commutation of DC machine requires

All of these
 brushes should be of proper grade and size.
 smooth, concentric commutator properly undercut.
 brushes should smoothly run in the holders.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  720 to 920.
  1440 to 2880.
  375 to 500.
  500 to 720.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 2
 2 alone
 1, 2 and 3
 1 and 3

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