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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be
crawling.
plugging.
locking.
cogging.
crawling.
plugging.
locking.
cogging.
Answer
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Related Question
Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.
none of these.
cylindrical.
salient.
non uniform cylindrical.
none of these.
cylindrical.
salient.
non uniform cylindrical.
Answer
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Electrical Machines
Rotating part of DC motor is known as
Starter.
Carbone brush.
Armature.
Pole.
Starter.
Carbone brush.
Armature.
Pole.
Answer
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Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor
Increase in speed but armature currnet remains the same.
Decrease in speed demanding less armature current.
Decrease in speed but armature current remains the same.
Increase in speed demanding more armature current.
Increase in speed but armature currnet remains the same.
Decrease in speed demanding less armature current.
Decrease in speed but armature current remains the same.
Increase in speed demanding more armature current.
Answer
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Electrical Machines
Rotor resistance speed control is used in
slip ring induction motor.
synchronous motor.
squirrel cage induction motor.
dc shunt motor.
slip ring induction motor.
synchronous motor.
squirrel cage induction motor.
dc shunt motor.
Answer
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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?
2166.67V, 270 rpm.
541.67V, 250 rpm.
541.67V, 200 rpm.
2166.67V, 230 rpm.
2166.67V, 270 rpm.
541.67V, 250 rpm.
541.67V, 200 rpm.
2166.67V, 230 rpm.
Answer
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