Insulation & Insulating materials - MCQs with Answers
Insulation & Insulating materials - MCQs with AnswersQ1. 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 Answer
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?
ANSWER: a. Operating voltage.
a. 1 M Ω
b. 10 M Ω
c. 0.1 M Ω
d. 0.01 M ΩView 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 Answer
Q4. What is the limit of the conductor cross section when paper insulation is used?
ANSWER: a. Is hygroscopic
a. 50 mm2
b. 250 mm2
c. 600 mm2
d. 1200 mm2View 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/mmView Answer / Hide AnswerQ6. What is empire tape?
a. Impregnated paper
b. Vulcanised rubber
c. Enamel insulation
d. Varnished cambricView Answer / Hide Answer
Q7. What is the percentage of added materials like sulphur, zinc lead etc in vulcanised rubber?
ANSWER: d. Varnished cambric
a. 5 – 10 %
b. 3 – 5 %
c. 4 – 8 %
d. 10 – 12 %View Answer / Hide Answer