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Electrical Machines
If the field winding connection of DC shunt motor is changed
It will run in same direction.
motor will become slow.
motor will not run.
It will run in opposite direction.
It will run in same direction.
motor will become slow.
motor will not run.
It will run in opposite direction.
Answer
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Related Question
Electrical Machines
Compensating winding are used to rectify the flux density waveform at
None of these
interpole region.
region under main pole.
throughout the air gap.
None of these
interpole region.
region under main pole.
throughout the air gap.
Answer
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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift
decreases in both generators and the motors with load.
increases in both the generators and the motors with load.
increases in generators but decreases in motor with load.
decreases in generators and increases in motor with load.
decreases in both generators and the motors with load.
increases in both the generators and the motors with load.
increases in generators but decreases in motor with load.
decreases in generators and increases in motor with load.
Answer
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Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will
continue to work as alternator but the direction of rotation will reverse.
start working as induction motor.
come to stand still.
continue to work as synchronous motor with same direction of rotation.
continue to work as alternator but the direction of rotation will reverse.
start working as induction motor.
come to stand still.
continue to work as synchronous motor with same direction of rotation.
Answer
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Electrical Machines
Hysteresis loss is proportional to
f1.5.
f.
f2.
f3.
f1.5.
f.
f2.
f3.
Answer
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Electrical Machines
In a DC Motor 3 point starter is used to
all of above.
provide protection against Low-Voltage.
provide overload protection.
limit the starting current to a safer value.
all of above.
provide protection against Low-Voltage.
provide overload protection.
limit the starting current to a safer value.
Answer
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