Characteristics of Potential Transformers

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Characteristics of Potential Transformers”.

1. Increasing secondary burden _____________
a) increases Is
b) decreases Is
c) keeps Is constant
d) decreases Ip

2. For a given Vp the Vs __________
a) increases
b) decreases
c) remains constant
d) depends on the supply

3. What is effect of the secondary burden on the ratio error?
a) ratio error is constant with secondary burden
b) ratio error decreases with secondary burden
c) ratio error increases with secondary burden
d) depends on the supply voltage

4. Vp is leading in phase, while Vs is lagging in phase.
a) True
b) False

5. What is the effect of p.f. on secondary burden?
a) Ip shifts towards Io
b) Ip deviates from Io
c) Ip is independent of Io
d) Ip and Io cancel eachother

6. How is the transformation ratio dependent on the secondary burden?
a) decreases
b) increases
c) remains constant
d) depends on the supply

7. Decrease in p.f. makes Vs to lead Vp.
a) True
b) False

8. At constant voltage how is frequency affected by flux?
a) decreases with an increase in flux
b) increases with a decrease in flux
c) remains constant
d) depends on the current

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