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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as
1 at 90°C.
0.5 at 90°C.
3 at 90°C.
2 at 90°C.
1 at 90°C.
0.5 at 90°C.
3 at 90°C.
2 at 90°C.
Answer
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Related Question
Electrical Machines
Field weakening control method is used for the _________ ?
both A and B
below rated speed
above rated speed
None of these
both A and B
below rated speed
above rated speed
None of these
Answer
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Electrical Machines
A smaller air gap in a polyphase induction motor helps to
increase the starting torque.
reduce the magnetizing current.
reduce the chance of crawling.
reduce the chance of cogging.
increase the starting torque.
reduce the magnetizing current.
reduce the chance of crawling.
reduce the chance of cogging.
Answer
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Electrical Machines
What is the full form of MNP?
Magnetic field neutral plane.
Magnetic neutral pole.
Magnetic field neutral pole.
Magnetic neutral plane.
Magnetic field neutral plane.
Magnetic neutral pole.
Magnetic field neutral pole.
Magnetic neutral plane.
Answer
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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase
None of these
supply voltage
rotor resistance
supply frequency
None of these
supply voltage
rotor resistance
supply frequency
Answer
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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be
less than core loss.
zero.
more than core loss.
equal to core loss.
less than core loss.
zero.
more than core loss.
equal to core loss.
Answer
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