Which of the following loss in a transformer is zero even at full load ?
A. Core loss
B. Friction loss
C. Eddy current loss
D. Hysteresis loss
Answer: Option B
Solution (By Examveda Team)
Transformers are static electrical devices, meaning they have no moving parts.Because of this, there are no mechanical losses such as friction or windage losses, which occur only in rotating machines like motors or generators.
Core losses (which include hysteresis and eddy current losses) occur whenever the transformer core is energized — that is, even under no-load conditions. These losses depend on the supply voltage and frequency, not on the load.
Copper losses occur only when the transformer carries load current and vary with the square of the load current.
Since a transformer has no moving parts, the friction loss is zero at all times — even at full load.
Hence, the correct answer is Friction loss.
This Question Belongs to Electrical Engineering >> Transformers
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Comments (3)
The purpose of providing an iron core in a transformer is to
A. provide support to windings
B. reduce hysteresis loss
C. decrease the reluctance of the magnetic path
D. reduce eddy current losses
A good voltage regulation of a transformer means
A. output voltage fluctuation from no load to full load is least
B. output voltage fluctuation with power factor is least
C. difference between primary and secondary voltage is least
D. difference between primary and secondary voltage is maximum
If the percentage impedances of the two transformers working in parallel are different, then
A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load
An ideal transformer will have maximum efficiency at a load such that
A. copper loss = iron loss
B. copper loss < iron loss
C. copper loss > iron loss
D. none of the above
There is no moving element, so air & friction loss is always zero.
Since no rotating is there. The transformer is a static device.
Friction loss is zero because in transformer there is no rotating parts in it