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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to
under commutation.
over commutation.
too rapid reversal of current.
any of the above.
under commutation.
over commutation.
too rapid reversal of current.
any of the above.
Answer
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Related Question
Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,
voltage ratio of all transformers must be same.
polarities of all transformers must be same.
percentage impedance of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
voltage ratio of all transformers must be same.
polarities of all transformers must be same.
percentage impedance of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
Answer
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Electrical Machines
The wattage rating of a ceiling fan motor will be
10 - 20 W.
200 - 250 W.
250 - 500 W.
50 - 150 W.
10 - 20 W.
200 - 250 W.
250 - 500 W.
50 - 150 W.
Answer
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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?
1500.
1440.
1450.
1435.
1500.
1440.
1450.
1435.
Answer
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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?
Differently compounded.
Shunt.
Cummulative compound.
Series.
Differently compounded.
Shunt.
Cummulative compound.
Series.
Answer
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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When
either field terminals are reversed or armature terminals are reversed.
only field terminals are changed.
none of above.
only armature terminals are reversed.
either field terminals are reversed or armature terminals are reversed.
only field terminals are changed.
none of above.
only armature terminals are reversed.
Answer
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