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Electrical Machines
The slip of an induction motor during DC rheostatic braking is
2 + s.
1 - s.
s.
2 - s.
2 + s.
1 - s.
s.
2 - s.
Answer
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Related Question
Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then
I1 = KI2 + Iw + Iμ.ok
I1 = KI2.
I1 = KI2 + Iw.
I1 = KI2 + Iμ.
I1 = KI2 + Iw + Iμ.ok
I1 = KI2.
I1 = KI2 + Iw.
I1 = KI2 + Iμ.
Answer
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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will
not run.
get damaged.
run in a direction opposite to previous one.
continue running in the same direction as before.
not run.
get damaged.
run in a direction opposite to previous one.
continue running in the same direction as before.
Answer
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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?
By varying supply voltage.
By varying number of poles.
By varying the supply frequency.
Both (A) and (B).
By varying supply voltage.
By varying number of poles.
By varying the supply frequency.
Both (A) and (B).
Answer
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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.
none of these.
has no relation.
directly.
inversely.
none of these.
has no relation.
directly.
inversely.
Answer
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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?
Starting torque.
Operating speed.
Starting torque, operating speed, full load current.
Full load current.
Starting torque.
Operating speed.
Starting torque, operating speed, full load current.
Full load current.
Answer
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