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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at normal speed.
 not run.
 run at lower speed.
 burn.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.02
 0.4
 0.2

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Electrical Machines
In DC generators brushes are used for

 convert ac armature current in to dc
 collecting of voltage
 reduce eddy current loss
 collecting of current without any sparkings

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 4.
 2.
 1.
  8.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 hyperbola
 linearised
 any of the above

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 machine B
 any of the two machines
 none of these
 machine A

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