12. The main purpose of performing open-circuit test on a transformer is to measure its :
(a) Cu loss
(b) core loss
(c) total loss
(d) insulation resistance
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Transformer » Exercise - 13. In an ideal transformer : (a) windings have no resistance (b) core has no losses (c) core has infinite permeability (d) all of the above- Transformer » Exercise - 114. At relatively light loads, transformer efficiency is low because : (a) secondary output is low (b) transformer losses are high (c) fixed loss is high in proportion to the output (d) Cu loss is small
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