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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where
Very fine speed control over the whole range from zero to normal speed is required.
The speed in both the direction is required.
All of above.
The accuracy in speed control is required.
Very fine speed control over the whole range from zero to normal speed is required.
The speed in both the direction is required.
All of above.
The accuracy in speed control is required.
Answer
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Related Question
Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?
Rotation can be changed by interchanging supply terminals.
None of these.
Direction of rotation cannot be changed.
Rotation can be changed by reversing main winding terminals.
Rotation can be changed by interchanging supply terminals.
None of these.
Direction of rotation cannot be changed.
Rotation can be changed by reversing main winding terminals.
Answer
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Electrical Machines
The armature MMF waveform of a DC machine is
rectangular.
sinusoidal.
triangular.
pulsating.
rectangular.
sinusoidal.
triangular.
pulsating.
Answer
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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?
4.
6.
data provided is insufficient.
2.
4.
6.
data provided is insufficient.
2.
Answer
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Electrical Machines
The wattage rating of a ceiling fan motor will be
50 - 150 W.
250 - 500 W.
10 - 20 W.
200 - 250 W.
50 - 150 W.
250 - 500 W.
10 - 20 W.
200 - 250 W.
Answer
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Electrical Machines
DC series motor is best suited for electric traction as
It consume less power.
It is cheaper in cost.
It runs at very high speed at light load.
It develops high starting torque.
It consume less power.
It is cheaper in cost.
It runs at very high speed at light load.
It develops high starting torque.
Answer
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