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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?
Field flux.
All of these.
Applied voltage.
Armature current.
Field flux.
All of these.
Applied voltage.
Armature current.
Answer
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Related Question
Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then
the machine with more drooping characteristic will supply more load.
None of these
the machine with more drooping characteristic will supply less load.
the machine will share load equally.
the machine with more drooping characteristic will supply more load.
None of these
the machine with more drooping characteristic will supply less load.
the machine will share load equally.
Answer
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Electrical Machines
Regenerative braking is not found in which motor?
DC shunt.
DC series.
Induction motor.
DC compound.
DC shunt.
DC series.
Induction motor.
DC compound.
Answer
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Electrical Machines
Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency then
The magnetude of current will increase, but power factor will decrease.
The magnitude of current will decrease but the power factor will increase.
The magnitude of circuit as well as the power factor will decrease.
The magnitude will both increase.
The magnetude of current will increase, but power factor will decrease.
The magnitude of current will decrease but the power factor will increase.
The magnitude of circuit as well as the power factor will decrease.
The magnitude will both increase.
Answer
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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?
Shunt.
Differntical compound.
Cummulative compound.
Series.
Shunt.
Differntical compound.
Cummulative compound.
Series.
Answer
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Electrical Machines
which of the following losses are negligible in blocked rotor test?
both A and B
iron loss
mechanical loss
copper loss
both A and B
iron loss
mechanical loss
copper loss
Answer
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