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Electrical Machines
Air core transformer as compared to iron core transformer, has
no magnetic core loss.
more copper loss.
more magnetic core loss.
less magnetic core loss.
no magnetic core loss.
more copper loss.
more magnetic core loss.
less magnetic core loss.
Answer
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Related Question
Electrical Machines
In a DC compound motor the field regulator is provided to
control the field flux.
limit the armature current.
demagnetize the field partially.
control the armature flux.
control the field flux.
limit the armature current.
demagnetize the field partially.
control the armature flux.
Answer
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Electrical Machines
In which of the following motors DC excitation is not required?
hysteresis motor
reluctance motor
3-phase synchronous generator
3-phase synchronous motor
hysteresis motor
reluctance motor
3-phase synchronous generator
3-phase synchronous motor
Answer
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Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because
it gives more uniform air-gap flux distribution
dc machines are comparatively low rating machines.
it reduces field structure iron losses
commutator action is not possible otherwise
it gives more uniform air-gap flux distribution
dc machines are comparatively low rating machines.
it reduces field structure iron losses
commutator action is not possible otherwise
Answer
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Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?
The speed will increase abruptly.
The speed will increase gradually.
The speed will increase in proportion to reduction in load.
The speed will remains almost constant.
The speed will increase abruptly.
The speed will increase gradually.
The speed will increase in proportion to reduction in load.
The speed will remains almost constant.
Answer
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Electrical Machines
Lap winding is prefered for which type of machines?
low current and high voltage
high current and low voltage
low current and low voltage
high current and high voltage
low current and high voltage
high current and low voltage
low current and low voltage
high current and high voltage
Answer
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