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Electrical Machines
Unbalance 3 - Φ stator currents cause
heating of rotor.
double frequency currents in the rotor.
All of these
vibrations.
heating of rotor.
double frequency currents in the rotor.
All of these
vibrations.
Answer
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Related Question
Electrical Machines
The principle of dynamically induced emf is utilized in
choke.
generator.
transformer.
thermocouple.
choke.
generator.
transformer.
thermocouple.
Answer
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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying
Any of above.
Shunt field resistance control.
Armature resistance control.
Armature voltage control.
Any of above.
Shunt field resistance control.
Armature resistance control.
Armature voltage control.
Answer
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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.
266.20 N-m.
cant be determined.
234.76 N-m.
133.22 N-m
266.20 N-m.
cant be determined.
234.76 N-m.
133.22 N-m
Answer
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Electrical Machines
The armature of DC motor is laminated
to reduce the hysteresis loss.
to reduce the inductor.
to reduce the mass.
to reduce the eddy current loss.
to reduce the hysteresis loss.
to reduce the inductor.
to reduce the mass.
to reduce the eddy current loss.
Answer
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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is
340 A.
460 A.
570 A.
250 A.
340 A.
460 A.
570 A.
250 A.
Answer
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