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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Starting torque.
  Effiency.
 Speed regulation.
 Running Torque.

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Electrical Machines
The basic function of a transformer is to change

 the power level
 the frequency
 the level of the voltage
 the power factor

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 0.5 mg of KOH / gm.
 2 mg of KOH / gm.
  0.3 mg of KOH / gm.
  1 mg of KOH / gm.

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Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Resistance split phase
 Capacitor start
 Capacitor run

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

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

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Electrical Machines
The commutator segments of DC machines are made up of

 brass
 hard-drawn copper
 copper alloy
 copper

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MORE MCQ ON Electrical Machines

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