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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is
1, 2, 5
1, 3, 5
1, 2, 3, 4
2, 3, 4
1, 2, 5
1, 3, 5
1, 2, 3, 4
2, 3, 4
Answer
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Related Question
Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?
By varying supply voltage.
By varying the supply frequency.
Both (A) and (B).
By varying number of poles.
By varying supply voltage.
By varying the supply frequency.
Both (A) and (B).
By varying number of poles.
Answer
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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is
2, 3, 4, 5
2, 3 ,5
2, 3, 4
1, 2, 3
2, 3, 4, 5
2, 3 ,5
2, 3, 4
1, 2, 3
Answer
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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by
disconnecting any one phase.
transposing any two leads from slip rings.
transposing any two leads from supply.
transposing all the three leads from the supply.
disconnecting any one phase.
transposing any two leads from slip rings.
transposing any two leads from supply.
transposing all the three leads from the supply.
Answer
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Electrical Machines
What does happen if tripled harmonics given to induction motor?
Will results in open circuit.
Fail to start.
Will results in short circuit.
Nothing will happen.
Will results in open circuit.
Fail to start.
Will results in short circuit.
Nothing will happen.
Answer
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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?
201.02 V.
205 V.
212 V.
210 V.
201.02 V.
205 V.
212 V.
210 V.
Answer
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