Lpsc technical assistant question with answer explained

Isro Lpsc technical assistant electrical and electronics engineering question with answers and explanations solved.

A transformer will have zero regulation at ?

(a) Zero power factor.
(b) Leading power factor.
(c) Unity power factor.
(d) Lagging power factor.

Answer: Leading power factor.

Lpsc isro technical assistant electrical engineering 2018 question paper.

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Notes.

Different types of regulations in transformer.

Up regulation - numerator load voltage.

Down regulation - numerator voltage without load.

Negative regulation - output high at leading power factor.

Positive regulation - output lower than input at unity and laging power factor.

Zero regulation - input=output at leading power factor.