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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as
V²
V
f²
f
V²
V
f²
f
Answer
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Related Question
Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.
10 volts.
40 volts.
30 volts.
20 volts.
10 volts.
40 volts.
30 volts.
20 volts.
Answer
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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?
equal to
greater than
less than
any of the above
equal to
greater than
less than
any of the above
Answer
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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be
locking.
plugging.
cogging.
crawling.
locking.
plugging.
cogging.
crawling.
Answer
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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?
None of above.
Remain unchanged
Increases.
Decreases.
None of above.
Remain unchanged
Increases.
Decreases.
Answer
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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along
direct axis and interpolar axis
direct axis and indirect axis
quadrature axis and interpolar axis
quadrature axis and direct axis
direct axis and interpolar axis
direct axis and indirect axis
quadrature axis and interpolar axis
quadrature axis and direct axis
Answer
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