Q. Secondary of a P.T. can be open circuited.

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Q. When C.T. is connected in series with a line, a large voltage exists across the primary.

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Q. Winding resistance of a P.T. can be reduced by _________

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Q. Leakage reactance is minimised by _________

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Q. High flux density is due to less turns.

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Q. Ratio error in a P.T. depends on _________

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Q. In a P.T. values of components of currents are negligible.

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Q. Ratio error can be minimised by _________

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Q. Another method of eliminating the ratio error is _________

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Q. How is the voltage ratio dependent on the frequency?

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Q. Increasing secondary burden _____________

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Q. For a given Vₚ the Vₛ __________

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Q. What is effect of the secondary burden on the ratio error?

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Q. Vₚ is leading in phase, while Vₛ is lagging in phase.

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Q. What is the effect of p.f. on secondary burden?

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Q. How is the transformation ratio dependent on the secondary burden?

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Q. Decrease in p.f. makes Vₛ to lead Vₚ.

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Q. At constant voltage how is frequency affected by flux?

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Q. A 50 Hz, bar primary CT has a secondary with 800 turns. The secondary supplies 7 A current into a purely resistive burden of 2 Ω. The magnetizing ampere-turns are 300. The phase angle is?

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Q. A 50 Hz, bar primary CT has a secondary with 500 turns. The secondary supplies 5 A current into a purely resistive burden of 1 Ω. The magnetizing ampere-turns are 200. What is the ratio error at full load, if the iron loss is 1.5 W and magnetizing mmf is 100 A?

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