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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.
50 V.
399 V.
100 V.
230.2 V.
50 V.
399 V.
100 V.
230.2 V.
Answer
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Related Question
Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
82.5%
72.5%
67.5%
78.5%
82.5%
72.5%
67.5%
78.5%
Answer
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Electrical Machines
Which of the following machine will have maximum efficiency?
Electrical power generator.
DC motor.
Electrical power transformer.
Induction motor.
Electrical power generator.
DC motor.
Electrical power transformer.
Induction motor.
Answer
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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when
the generator runs on designed speed.
the generator runs on overload.
there is no load on the generator.
the generator runs on full load.
the generator runs on designed speed.
the generator runs on overload.
there is no load on the generator.
the generator runs on full load.
Answer
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Electrical Machines
To avoid formation of grooves in the commutator
the brushes of same polarity should track each other.
the brushes of opposite polarity should track each other.
None of these
brush position has no effect on the commutator grooving.
the brushes of same polarity should track each other.
the brushes of opposite polarity should track each other.
None of these
brush position has no effect on the commutator grooving.
Answer
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Electrical Machines
Commonly used starters of cage motor is
DOL.
both A and B.
star delta.
None of these
DOL.
both A and B.
star delta.
None of these
Answer
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