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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?
No wave and lap winding.
Wave winding.
Both wave and lap winding.
Lap winding.
No wave and lap winding.
Wave winding.
Both wave and lap winding.
Lap winding.
Answer
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Related Question
Electrical Machines
Ward Leonard control provides speed control
in both direction.
in one direction only.
below rated speed.
above rated speed.
in both direction.
in one direction only.
below rated speed.
above rated speed.
Answer
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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.
4.
2.
8.
6.
4.
2.
8.
6.
Answer
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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to
reduce magnetising current and improve power factor
increase pull out torque
decrease starting torque
improve starting torque
reduce magnetising current and improve power factor
increase pull out torque
decrease starting torque
improve starting torque
Answer
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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of
All of these
power factor and supply voltage during hunting
power factor and dc excitation at constant load
supply voltage and field current at constant excitation
All of these
power factor and supply voltage during hunting
power factor and dc excitation at constant load
supply voltage and field current at constant excitation
Answer
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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to
over commutation.
too rapid reversal of current.
any of the above.
under commutation.
over commutation.
too rapid reversal of current.
any of the above.
under commutation.
Answer
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