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Transformers
A transformer will have zero efficiency at
None of the listed here
Half full load
Full load
No load
None of the listed here
Half full load
Full load
No load
Answer
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Related Question
Transformers
In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be
(l-s)Ns
s.N.
Ns
(Ns-l)s
(l-s)Ns
s.N.
Ns
(Ns-l)s
Answer
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Transformers
The amount of copper in the primary is _______that of secondary.
Greater than
None of the listed here
Smaller than
About the same as
Greater than
None of the listed here
Smaller than
About the same as
Answer
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Transformers
The maximum flux produced in the core of a transformer is ______
Directly proportional to supply frequency
None of the listed here
Inversely proportional to supply frequency
Inversely proportional to primary voltage
Directly proportional to supply frequency
None of the listed here
Inversely proportional to supply frequency
Inversely proportional to primary voltage
Answer
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Transformers
The permissible flux density in case of cold rolled grain oriented steel is around
2.7 Wb/m²
1.7 Wb/m²
4.7 Wb/m²
3.7 Wb/m²
2.7 Wb/m²
1.7 Wb/m²
4.7 Wb/m²
3.7 Wb/m²
Answer
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Transformers
The maximum load that a power transformer can carry is limited by its
temperature rise
dielectric strength of oil
voltage ratio
copper loss
temperature rise
dielectric strength of oil
voltage ratio
copper loss
Answer
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