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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.
kept constant to certain value.
decreased.
increased.
remains unchanged.
kept constant to certain value.
decreased.
increased.
remains unchanged.
Answer
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Related Question
Electrical Machines
The output power of a dc motor is given by
EIa.
EbIa2.
none of these.
EbIa.
EIa.
EbIa2.
none of these.
EbIa.
Answer
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Electrical Machines
In DC generator, the electricity produced in armature is
DC.
AC.
armature is not present in DC generator.
None of these
DC.
AC.
armature is not present in DC generator.
None of these
Answer
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Electrical Machines
Maximum power will be developed when back emf is
double the supply voltage.
All of these
equal to supply voltage.
half of the supply voltage.
double the supply voltage.
All of these
equal to supply voltage.
half of the supply voltage.
Answer
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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then
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.
the machine with more drooping characteristic will supply more load.
None of these
the machine with more drooping characteristic will supply less load.
Answer
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Electrical Machines
The oscillation in a synchronous motor can be damped out by
providing damper bars in the rotor pole faces.
maintaining constant excitation.
running the motor on leading power factors.
oscillation cannot be damped.
providing damper bars in the rotor pole faces.
maintaining constant excitation.
running the motor on leading power factors.
oscillation cannot be damped.
Answer
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