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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less cost.
  all of below.
  simple in construction.
  less maintenance.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 vibrations.
 eddy electric current loss.
 copper loss.
 hysteresis loss.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

  222 V.
 220 V.
 230 V.
 225 V.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and direct axis
 quadrature axis and interpolar axis
 direct axis and indirect axis
 direct axis and interpolar axis

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% increase
 36.36% increase
 18.18% increase
 36.36% decrease

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Electrical Machines
Copper brushes in DC machine are used

None of these
 where high voltage and low current.
 where low voltage and high currents are involved.
 in both of above cases.

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MORE MCQ ON Electrical Machines

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