Conditions for Parallel Operation - MCQs with Answers

Conditions for Parallel Operation - MCQs with Answers

Q1. For parallel operation of transformers, the most satisfactory condition is achieved when the load shared by the transformers is in exact proportion with their

a. Efficiency
b. Ratings
c. Impedances
d. None of these

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Q2. Two transformers are operated in parallel, most essential condition to be satisfied is

a. Polarities should be same
b. Leakage reactance should be equal
c. Turns ratios should be equal
d. Impedances should be in proportion to their kVA rating

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Q3. For carrying out parallel operation, transformers should have same X / R ratio in order to avoid

a. Leakage reactance
b. Insulation failure
c. Circulating current
d. Inrush current

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Q4. If the transformers have different kVA ratings, then for parallel operation the equivalent impedances should be

a. Directly proportional to individual kVA rating
b. Inversely proportional to individual kVA rating
c. Inversely proportional to the square of the individual kVA rating
d. Directly proportional to the square of individual kVA rating

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Q5. For satisfactory parallel operation, the circulating current should not exceed

a. 5% of normal rated current
b. 50% of normal rated current
c. 10% of normal rated current
d. 25% of normal rated current

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Q6. For parallel operation of transformers, the p.u. impedances of transformer must be (based on their own kVA rating)

a. directly proportional to their ratings
b. inversely proportional to their ratings
c. equal
d. none of these

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