The use of higher flux density in the transformer design
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Transformers
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A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is
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In a transformer the tappings are generally provided on
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No-load current in a transformer
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The purpose of providing iron core in a step-up transformer is
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Which of the following is not the standard voltage for power supply in India?
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When the equivalent circuit diagram of doouble squirrelcage induction motor is constructed the two cages can be considered
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An ideal transformer has infinite values of primary and secondary inductances. The statement is
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During open circuit test of a transformer
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Which of the following is not a routine test on transformers?
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The efficiencies of transformers compared with that of electric motors of the same power are
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The noise resulting from vibrations of laminations set by magnetic forces, is termed as
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The power transformer is a constant
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Sumpner's test is conducted on transformers to determine
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For the parallel operation of single phase transformers it is necessary that they should have
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In a transformer routine efficiency depends upon
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No-load on a transformer is carried out to determine
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The dielectric strength of transformer oil is expected to be
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A transformer oil must be free from
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Losses which occur in rotating electric machines and do not occur in trans formers are
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