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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to
240 A.
190 A.
173 A.
127 A.
240 A.
190 A.
173 A.
127 A.
Answer
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Related Question
Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?
Wave winding.
Both wave and lap winding.
No wave and lap winding.
Lap winding.
Wave winding.
Both wave and lap winding.
No wave and lap winding.
Lap winding.
Answer
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Electrical Machines
Value of specific electric loading of Induction motor is in the range of
5000 - 45000 ampere conductor / metre.
400 - 4000 ampere conductor / metre.
40 - 400 ampere conductor / metre.
30000 - 100000 ampere conductor / metre.
5000 - 45000 ampere conductor / metre.
400 - 4000 ampere conductor / metre.
40 - 400 ampere conductor / metre.
30000 - 100000 ampere conductor / metre.
Answer
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Electrical Machines
The self induced emf in the coil undergoing commutation is called the
None of these
reactance voltage.
statically induced voltage.
dynamically induced voltage.
None of these
reactance voltage.
statically induced voltage.
dynamically induced voltage.
Answer
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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in
Armature voltage.
Supply voltage.
Field excitaion.
Armature current.
Armature voltage.
Supply voltage.
Field excitaion.
Armature current.
Answer
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Electrical Machines
What are the starters used for starting of cage motors?
Auto transformer starter.
DOL starter.
Star-delta starter.
All of these.
Auto transformer starter.
DOL starter.
Star-delta starter.
All of these.
Answer
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