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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is
2, 3, 6
1, 2, 5
3, 4, 5
2, 4, 5, 6
2, 3, 6
1, 2, 5
3, 4, 5
2, 4, 5, 6
Answer
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Related Question
Electrical Machines
The constant losses in transformer is/are
eddy current loss.
hysteresis loss.
both 2 and 3.
copper loss.
eddy current loss.
hysteresis loss.
both 2 and 3.
copper loss.
Answer
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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.
266.20 N-m.
234.76 N-m.
can not be determined.
133.22 N-m
266.20 N-m.
234.76 N-m.
can not be determined.
133.22 N-m
Answer
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Electrical Machines
Number of tappings for each equalizer ring is equal to
number of parallel paths.
number of pole pairs.
number of commutator segments.
number of poles.
number of parallel paths.
number of pole pairs.
number of commutator segments.
number of poles.
Answer
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Electrical Machines
The wound rotor type IM is used for____________ speed operation.
minimum.
maximum.
constant.
variable.
minimum.
maximum.
constant.
variable.
Answer
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Electrical Machines
At stand still condition the value of slip is
0
infinite value
finite value
1
0
infinite value
finite value
1
Answer
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