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Test: Thermal Conductivity of Materials - Mechanical Engineering MCQ


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10 Questions MCQ Test Heat Transfer - Test: Thermal Conductivity of Materials

Test: Thermal Conductivity of Materials for Mechanical Engineering 2024 is part of Heat Transfer preparation. The Test: Thermal Conductivity of Materials questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Thermal Conductivity of Materials MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Thermal Conductivity of Materials below.
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Test: Thermal Conductivity of Materials - Question 1

Thermal conductivity is defined as the heat flow per unit time

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Thermal conductivity of a material is because of migration of free electrons and lattice vibrational waves.

Test: Thermal Conductivity of Materials - Question 2

Mark the matter with least value of thermal conductivity

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For air it is .024 W/ m degree i.e. lowest.

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Test: Thermal Conductivity of Materials - Question 3

Which one of the following forms of water have the highest value of thermal conductivity?

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For ice it is 2.25 W/m degree i.e. maximum.

Test: Thermal Conductivity of Materials - Question 4

The average thermal conductivities of water and air conform to the ratio

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For water it is 0.55-0.7 W/m degree and for air it is .024 W/m degree.

Test: Thermal Conductivity of Materials - Question 5

Identify the very good insulator

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Glass wool has lowest thermal conductivity of 0.03 W/m degree amongst given option.

Test: Thermal Conductivity of Materials - Question 6

Most metals are good conductor of heat because of

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For good conductors there must be electrons that are free to move.

Test: Thermal Conductivity of Materials - Question 7

Heat conduction in gases is due to

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If there is elastic collision then after sometime molecules regain its natural position.

Test: Thermal Conductivity of Materials - Question 8

The heat energy propagation due to conduction heat transfer will be minimum for

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It is because air has lowest value of thermal conductivity amongst given options.

Test: Thermal Conductivity of Materials - Question 9

Cork is a good insulator because

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Cork has thermal conductivity in the range of 0.05-0.10 which is very low so it can be porous.

Test: Thermal Conductivity of Materials - Question 10

Choose the false statement

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Thermal conductivity increase with increase in density of substance.

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