Insulation Failures & Tests - MCQs with Answers

Insulation Failure & Tests - MCQs with Answers

Q1. The insulators fail due to

a. Flash over.
b. Short circuits.
c. Deposition of dust.
d. All of these.

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Q2. The number of discs required for 220 kV ac over head transmission line in clear atmosphere is

a. 10 – 12.
b. 21 – 22.
c. 12 – 14.
d. 5 – 6.

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Q3. At what angle is the water sprayed on the insulator in 50 cycle wet test?

a. 35 °C
b. 40 °C
c. 45 °C
d. 50 °C

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Q4. What is the value of the wave front and the wave tail of the standard lightning impulse wave used in the impulse voltage withstand test?

a. 50 μ sec and 1.2 μ sec.
b. 1.2 μ sec and 50 μ sec.
c. 50 μ sec and 2.1 μ sec.
d. 2.1 μ sec and 50 μ sec.

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