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Electrical Machines

Electrical Machines
DC machine windings are

 short pitched
 full pitched
None of these
 either of these

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 both A and B
 constant loss
 variable loss

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 sinusoidal.
 trapezoidal.
 rectangular.
  triangular.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 magnetic saturation in half of the field pole
 uneven air-gap length
 non-sinusoidal nature of armature mmf
 component of armature mmf along field axis

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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

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

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at the first stud of starting resistance steps.
 Both of above.
 None of these.
 Heavy sparking at brushes.

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