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For the following questions answer them individually
For a dc machine shuntresistance and armature resistance values are
high and high
high and low
low and low
low and high
If the field of a dc shunt motor gets opened while the motoris running, then the
motor will become slow.
motor will attain dangerously high speed
armature current will drop
armature will oscillate about original speed as the mean speed
Inter pole winding is connected in .....
series with armature
series with main poles
parallel with armature
parallel with main poles
In large machinesflat copperstrips know as
windings
bushes
risers
either of these
Lap winding is preferred for
low current and low voltage
high current and high voltage
high current and low voltage
low current and high voltage
Scott connections are used for
single phase to three phase transformation
three phase to single phase transformation
three phase to two phase transformation
any of the above
The primary and secondary windings of an Auto transformer are
magnetically coupled
electrically coupled
both magnetically and electrically coupled
None of these
A 40KVAtransformerhas a core loss of 450 W andtotal loss of 800 W. Find the copperloss for Maximum efficiency.
350 W
800 W
450 W
The difference between the stator synchronous speed and rotor speedsis called
leading speed
lagging speed
slip speed
slow speed
In three induction motor maximum torque is inversely proportional to the
stator voltage
speed of rotor
rotor reactance
decreasing slip speed
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