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Electrical Machines
Secondary winding of an auto transformer is also called
compensating winding.
common winding.
damping winding.
tertiary winding.
compensating winding.
common winding.
damping winding.
tertiary winding.
Answer
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Related Question
Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become
one fourth.
4 times.
double.
half.
one fourth.
4 times.
double.
half.
Answer
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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is
1200
1203
1000
1080
1200
1203
1000
1080
Answer
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Electrical Machines
The sparking at the the brushes, in a DC machines is due to
armature reaction.
high resistance of carbon brushes.
presence of commutator.
reactance voltage.
armature reaction.
high resistance of carbon brushes.
presence of commutator.
reactance voltage.
Answer
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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to
30°.
75°.
0°.
45°.
30°.
75°.
0°.
45°.
Answer
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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.
cant be determined.
133.22 N-m
234.76 N-m.
266.20 N-m.
cant be determined.
133.22 N-m
234.76 N-m.
266.20 N-m.
Answer
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