Parallel Operation of Transformers - MCQs with Answers

Parallel Operation of Transformers - MCQs with Answers


Q1. A load of 110kW at 0.8 power factor is to be shared by two single phase transformer with equal turns have impedances equal to (0.4 + j 0.2) and (0.6 + j 0.8) with respect to secondary. How will they share the load if they are operating in parallel?

a. 80kW, 30kW
b. 82.55kW, 28.45kW
c. 75.55kW, 24.45kW
d. 85.45kW, 24.55kW

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ANSWER: d. 85.45kW, 24.55kW



Q2. If two transformers are operated in parallel with voltage ratio of transformer 1 slightly greater than that of 2. E1 and E2 are the induced emf of transformer 1 and 2, and Z1 and Z2 are the impedances then the circulating current is given by

a. (E1-E2) / (Z1+Z2)
b. (E1+E2) / (Z1+Z2)
c. (Z1-Z2) / (E1-E2)
d. (Z1-Z2) / (E1+E2)

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ANSWER: a. (E1-E2) / (Z1+Z2)


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