Transformer Multiple Choice Questions and Answers


6. No-load test on a transformer is caried out to determine.......

   A.Magnetising current

   B.Copper loss

   C.Magnetising current and no-load loss

   D.Efficiency of the transformer


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C.Magnetising current and no-load loss

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7. Transformers are rated in KVA instead of KW because........

   A.Load power factor is often not known

   B.KVA is fixed whereas KW depends on load power factor

   C.Total transformer loss depends on volt-ampere

   D.It has become customary


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C.Total transformer loss depends on volt-ampere

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8. A relatively light loads,transformer efficiency is low because........

   A.Second output is lowα

   B.Transformer losses are highα

   C.Fixed loss is high in proportion to the outputα

   D.Cu loss is smallα


✔ View Answer


C.Fixed loss is high in proportion to the outputα

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9. Which of the following is not a basic element of transformer?........

   A.Core

   B.Primary Winding

   C.Secondary Winding

   D.Mutual Flux


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D.Mutual Flux

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10. The all-day efficiency of a transformer depends primirily on........

   A.Its copper loss

   A.The amount of load

   C.The duration of load

   D.Both (b) and (c)


✔ View Answer


D.Both (b) and (c)

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