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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to
decrease the amount of copper to be used.
increase the strength of rotor bars.
reduce the magnetic hum and locking tendency of rotor.
provide ease of fabrication.
decrease the amount of copper to be used.
increase the strength of rotor bars.
reduce the magnetic hum and locking tendency of rotor.
provide ease of fabrication.
Answer
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Related Question
Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is
4.76%.
3.76%.
2.56 %.
2.57 %.
4.76%.
3.76%.
2.56 %.
2.57 %.
Answer
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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them
None of these
just behind the magnetic neutral axis.
in magnetic neutral axis.
just ahead of magnetic neutral axis.
None of these
just behind the magnetic neutral axis.
in magnetic neutral axis.
just ahead of magnetic neutral axis.
Answer
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Electrical Machines
If we increase the rotor reactance value, the maximum torque will
not changed
increase
None of these
decrease
not changed
increase
None of these
decrease
Answer
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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be
240 rpm.
540 rpm.
450 rpm.
470 rpm.
240 rpm.
540 rpm.
450 rpm.
470 rpm.
Answer
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Electrical Machines
Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are
1, 2, 3 and 5
1, 3 and 5
1, 2 and 3
1 and 3
1, 2, 3 and 5
1, 3 and 5
1, 2 and 3
1 and 3
Answer
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