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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the
rotor at slip rings.
stator phases of the motor.
starting resistance in the starter.
None of these
rotor at slip rings.
stator phases of the motor.
starting resistance in the starter.
None of these
Answer
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Related Question
Electrical Machines
Dummy coils are used for
All of these
mechanical balancing.
reducing armature reaction.
increasing efficiency.
All of these
mechanical balancing.
reducing armature reaction.
increasing efficiency.
Answer
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Electrical Machines
Which slots are used in the rotor of an induction motor?
Closed slots.
None of above.
Open slots.
Semi closed slots.
Closed slots.
None of above.
Open slots.
Semi closed slots.
Answer
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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through
slip rings.
none of above.
solid connection.
commutator.
slip rings.
none of above.
solid connection.
commutator.
Answer
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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is
36.36% increase
36.36% decrease
18.18% increase
36.36% increase
36.36% increase
36.36% decrease
18.18% increase
36.36% increase
Answer
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Electrical Machines
Generators work on the principle of production of
dynamically and statically induced emf.
dynamically induced emf.
None of these
statically induced emf.
dynamically and statically induced emf.
dynamically induced emf.
None of these
statically induced emf.
Answer
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