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A 400kVA transformer has a primary winding resistance of 0.5Ω and a secondary winding resistance of 0.001Ω .
The iron loss is 2.5kW and the primary and secondary voltages are 5kV and 320V respectively. If the power factor of the load is 0.85,
Determine the efficiency of the transformer
(a) on full load, and
(b) on half load
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What are different pumping mechanisms in LASERS?
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If the refractive index of a medium is 1.5, determine the critical angle. Write the difference between telescope and microscope.
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