Insulators - MCQs with answers

Insulators - MCQs with answers

Q1. Which type of insulator is used on 132 kV transmission lines?

a. Pin type.
b. Disc type.
c. Shackle type.
d. Pin and shackle type.

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Q2. Where is the strain type insulators used?

a. At dead ends.
b. At any intermediate anchor tower.
c. On straight runs.
d. Either (a) or (b).

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Q3. Porcelain is produced by firing at high temperature of which all mixtures?

a. Kaolin
b. Feldspar
c. Quartz
d. All of these.

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Q4. What is the dielectric strength of porcelain?

a. 55 kV/cm.
b. 60 kV/cm.
c. 75 kV/cm.
d. 80 kV/cm.

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Q5. Why is the wavy structure of pin insulators used?

a. Increases mechanical strength.
b. Increases puncture strength.
c. Increases flash over voltage.
d. Increases thermal strength.

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Q6. The number of discs in a string of insulators for 400 kV ac over head transmission line lies in the range of

a. 32 – 33
b. 22 – 23
c. 15 – 16
d. 9 – 10

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