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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs
either of these.
decrease.
increase.
None of these
either of these.
decrease.
increase.
None of these
Answer
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Related Question
Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is
500 VA
110 VA
550 VA
100 VA
500 VA
110 VA
550 VA
100 VA
Answer
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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will
None of these
increase
either increase or decrease
decrease
None of these
increase
either increase or decrease
decrease
Answer
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Electrical Machines
The crawling in the induction motor is caused by
improper design of stator laminations
high loads
harmonics developed in the motor
low voltage supply
improper design of stator laminations
high loads
harmonics developed in the motor
low voltage supply
Answer
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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a
Straight line through the origin.
Circle about the origin.
Straight line parallel to the speed axis.
Rectangular hyperbola
Straight line through the origin.
Circle about the origin.
Straight line parallel to the speed axis.
Rectangular hyperbola
Answer
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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor
will become lagging
will become leading
will remain the same
None of these
will become lagging
will become leading
will remain the same
None of these
Answer
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