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Question

# A 100 VA, 120/12 V transformer is to be connected so as to form a step up auto transformer. If a primary voltage of 120 V is applied to the transformer, then its maximum volt ampere rating in this mode of operation is

A
200 VA
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B
1200 VA
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C
100 VA
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D
1100 VA
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Solution

## The correct option is D 1100 VA VH=132 V The maximum volt-ampere rating in either winding of this transformer is 100 VA. The voltage on series winding is 12 V. Iseries,max=SmaxVseries=10012=8.33 A Since Iseries is equal to IH, so secondary apparent power is Sout=VsIs=VHIH=132×8.33 =1100VA

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