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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Q. A 1000/5 A, 50 Hz correct transformer has a secondary burden comprising a non-inductance of 1.6Ω. The flux in the core at full load is?

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Q. A 1000/5 A, 50 Hz correct transformer has a secondary burden comprising a non-inductance of 2Ω. What is the ratio error, if the iron loss is 3 W and magnetizing mmf is 250 A?

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Q. A 200/1 Current Transformer (CT) is wound with 400 turns on the secondary on a toroidal core. When it carries a current of 180 A on the primary, the ratio is found to be -0.5%. If the number of secondary turns is reduced by 1, the new ratio error (in %) will be?

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Q. A (350 A/ 7A), 50 Hz current transformer has a primary bar. The secondary burden is a pure resistance of 1 Ω and it draws a current of 5 A. The magnetic core requires 350 AT for magnetization. Find the percentage ratio error.

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Q. The observation when the secondary winding of a current transformer is open-circuited is?

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Q. Usually a CT has ____________

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