Insulation & Insulating materials - MCQs with Answers
Insulation & Insulating materials - MCQs with Answers
Q1. The thickness of insulation provided on the conductor in the cable depends on which among the following factor?a. Operating voltage.
b. Current to be carried.
c. Power factor.
d. Both (a) and (b).
View Answer / Hide AnswerANSWER: a. Operating voltage.
Q2. The insulation resistance of a cable of length 10 km is 1M Ω . For a length of 100 km of the same cable, what will be the insulation resistance?a. 1 M Ω
b. 10 M Ω
c. 0.1 M Ω
d. 0.01 M Ω
View Answer / Hide AnswerQ3. What is the main drawback of using paper as the insulating material?a. Is hygroscopic
b. Has poor dielectric strength.
c. Has a very low insulation resistivity.
d. Has high capacitance.
View Answer / Hide AnswerANSWER: a. Is hygroscopic
Q4. What is the limit of the conductor cross section when paper insulation is used?a. 50 mm
2b. 250 mm
2c. 600 mm
2d. 1200 mm
2View Answer / Hide AnswerQ5. What is the dielectric strength of impregnated paper?a. 30 kV/mm
b. 20 kV/mm
c. 15 kV/mm
d. 5 kV/mm
View Answer / Hide AnswerQ6. What is empire tape?a. Impregnated paper
b. Vulcanised rubber
c. Enamel insulation
d. Varnished cambric
View Answer / Hide AnswerANSWER: d. Varnished cambric
Q7. What is the percentage of added materials like sulphur, zinc lead etc in vulcanised rubber?a. 5 – 10 %
b. 3 – 5 %
c. 4 – 8 %
d. 10 – 12 %
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