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Electrical Machines
The armature MMF waveform of a DC machine is
triangular.
pulsating.
sinusoidal.
rectangular.
triangular.
pulsating.
sinusoidal.
rectangular.
Answer
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Related Question
Electrical Machines
During no load test, an induction motor draws power
for core loss and windage and friction loss.
for copper loss and windage friction loss.
only for the small copper loss.
for core loss and copper loss.
for core loss and windage and friction loss.
for copper loss and windage friction loss.
only for the small copper loss.
for core loss and copper loss.
Answer
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Electrical Machines
In an alternator the voltage generated per phase is proportional to
All of these
frequency of waveform.
number of turns in coil.
flux per pole.
All of these
frequency of waveform.
number of turns in coil.
flux per pole.
Answer
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Electrical Machines
In a DC machine, for the same value of Æ, Z and N; which one of the following statements is correct?
Armature emf is more with wave winding than with lap winding.
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is less with wave winding than with lap winding.
Armature emf is more with wave winding than with lap winding.
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is less with wave winding than with lap winding.
Answer
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Electrical Machines
Inter pole winding is connected in-------------------------- ?
parallel with main poles
series with main poles
series with armature
parallel with armature
parallel with main poles
series with main poles
series with armature
parallel with armature
Answer
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Electrical Machines
The use of higher flux density in the transformer design
None of these
reduces the weigh per KVA
has no relation with the weight of transformer
increases the weigh per KVA
None of these
reduces the weigh per KVA
has no relation with the weight of transformer
increases the weigh per KVA
Answer
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