V-V & T-T Connection in Three Phase Transformers - MCQs with Answers

V-V & T-T Connection in Three Phase Transformers - MCQs with Answers

Q1. The load carried by V - V connection is

a. 47.7% of the original load
b. 57.7% of the original load
c. 67.7% of the original load
d. 87.7% of the original load

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Q2. Consider three transformers connected in delta-delta fashion and supplying their rated load. Now if one of the transformer is removed then each of the remaining two transformer is overloaded. The overload on each transformer is given as

a. 1
b. 1.232
c. 1.732
d. 1.872

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Q3. The average power factor at which V-V bank is operating is less than that with the load. The power factor is

a. 57.7% of the balanced load power factor
b. 66.7% of the balanced load power factor
c. 86.6% of the balanced load power factor
d. None of theses

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Q4. With a bank of two single phase transformers connected in V - V fashion supplying a balanced three phase load with Cosφ as power factor. The power factor of the two transformers is given by

a. Cosφ , Cosφ
b. Cosφ, Cos(30+φ)
c. Cos(30-φ), Cos(30+φ)
d. Cos(30-φ), Cosφ

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Q5. In T-T connection, the percentage tapping of main transformer and teaser transformer are

a. 50%, 86.6%
b. 50%, 50%
c. 86.6%, 86.6%
d. 86.6%, 50%

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Q6. In T-T connection, the ratio of actual capacity to the available capacity is

a. 1
b. 0.928
c. 1.928
d. 0.5

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