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Transformers
If a transformer core has air gaps, then, _________
Reluctance of magnetic path is decreased
Eddy current is increased
Hysteresis loss is decreased
Magnetising current is greatly increased
Reluctance of magnetic path is decreased
Eddy current is increased
Hysteresis loss is decreased
Magnetising current is greatly increased
Answer
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Related Question
Transformers
In a transformer the resistance between its primary and secondary is
1 ohm
Zero
Infinite
1000 ohms
1 ohm
Zero
Infinite
1000 ohms
Answer
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Transformers
A transformer operates poorly at very low frequencies because _____
Primary reactance is too much increased
Magnetising current is abnormally high
Permeability of core is increased
None of the listed here
Primary reactance is too much increased
Magnetising current is abnormally high
Permeability of core is increased
None of the listed here
Answer
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Transformers
Which of the following is the main advantage of an auto-transformer over a two winding transformer?
Eddy losses are totally eliminated
Copper losses are negligible
Saving in winding material
Hysteresis losses are reduced
Eddy losses are totally eliminated
Copper losses are negligible
Saving in winding material
Hysteresis losses are reduced
Answer
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Transformers
The permissible flux density in case of cold rolled grain oriented steel is around
1.7 Wb/m²
2.7 Wb/m²
3.7 Wb/m²
4.7 Wb/m²
1.7 Wb/m²
2.7 Wb/m²
3.7 Wb/m²
4.7 Wb/m²
Answer
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Transformers
The efficiency of a transformer, under heavy loads, is comparatively low because
voltage drop both in primary and secondary becomes large
secondary output is much less as compared to primary input
iron loss is increased considerably
copper loss becomes high in proportion to the output
voltage drop both in primary and secondary becomes large
secondary output is much less as compared to primary input
iron loss is increased considerably
copper loss becomes high in proportion to the output
Answer
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