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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will
increase by 200%
increase by 100%
remain unaltered
reduced to half
increase by 200%
increase by 100%
remain unaltered
reduced to half
Answer
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Related Question
Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will
Remain unaltered.
Reduce.
Oscillate around the normal speed.
Increase.
Remain unaltered.
Reduce.
Oscillate around the normal speed.
Increase.
Answer
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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.
38.5 Nm.
27.73 Nm .
74 Nm.
65.8 Nm.
38.5 Nm.
27.73 Nm .
74 Nm.
65.8 Nm.
Answer
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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as
35 ppm.
45 ppm.
20 ppm.
25 ppm.
35 ppm.
45 ppm.
20 ppm.
25 ppm.
Answer
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Electrical Machines
Belt conveyors offer _______________ starting torque.
medium.
low.
high.
zero.
medium.
low.
high.
zero.
Answer
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Electrical Machines
Maximum power developed depends on
both 1and 2
voltage
reactance
load angle
both 1and 2
voltage
reactance
load angle
Answer
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