Methods of Increasing String Efficiency in Insulator - MCQs with Answers

Methods of Increasing String Efficiency in Insulator - MCQs with Answers

Q1. What is the purpose of guard ring?

a. Reduce the earth capacitance of the lowest unit.
b. Increase the earth capacitance of the lowest unit.
c. Reduce the transmission line losses.
d. None of these.

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Q2. Assertion (A): The string efficiency can be improved by using long cross arms.
Reason (R): Use of long cross arms reduces the ratio of capacity to earth to capacity per insulator thereby increasing the string efficiency.

a. Both A and R are true and R is the correct explanation of A
b. Both A and R are true and R is not the explanation of A
c. A is true but R is false
d. A is false but R is true.

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Q3. Assertion (A): Capacitance grading improves the string efficiency not more than 220 kV.
Reason (R): In capacitance grading the units used are of different capacitance and so are not interchangeable.

a. Both A and R are true and R is the correct explanation of A
b. Both A and R are true and R is not the explanation of A
c. A is true but R is false
d. A is false but R is true.

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Q4. Which shielding is called the static shielding of the string?

a. Using the guard rings.
b. Grading the insulators.
c. Increasing the length of cross arms.
d. None of this.

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