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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?
38%
60%
68%
40%
38%
60%
68%
40%
Answer
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Related Question
Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :
1, 2 and 3
1 and 2
1 and 3
2 and 3
1, 2 and 3
1 and 2
1 and 3
2 and 3
Answer
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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is
1/√5
1/√2
2/√5
1/3
1/√5
1/√2
2/√5
1/3
Answer
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Electrical Machines
In an alternator, voltage drops occurs in
armature resistance and leakage reactance.
armature resistance, leakage reactance, armature reaction and earth connection.
armature resistance, leakage reactance and armature reaction.
armature resistance only.
armature resistance and leakage reactance.
armature resistance, leakage reactance, armature reaction and earth connection.
armature resistance, leakage reactance and armature reaction.
armature resistance only.
Answer
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Electrical Machines
Compensating windings are used in DC generators
mainly to reduce the eddy currents by providing local short circuit.
to neutralize the cross magnetizing effect of the armature reaction.
None of these
to provide path for the circulation of cooling air.
mainly to reduce the eddy currents by providing local short circuit.
to neutralize the cross magnetizing effect of the armature reaction.
None of these
to provide path for the circulation of cooling air.
Answer
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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?
1
0
0.5
any of the above
1
0
0.5
any of the above
Answer
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