Q. Consider the following statements:

The Fourier heat conduction equation

Q = -k A d t /d x

Presumes

i) Steady state conditions

ii) Constant value of thermal conductivity

iii) Uniform temperature at the wall surface

iv) One dimensional heat flow

Which of these statements are correct?

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Q. Negative sign in Fourier heat conduction equation indicates

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Q. Transmission of heat i.e. molecular is smallest in case of

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Q. Which one is not the unit of thermal conductivity?

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Q. “Thermal conductivity represents the amount of heat conducted across unit area when a temperature difference of one kelvin”. True or false

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Q. Which of the following is the unit of thermal resistance?

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Q. Thermal conductivity is defined as the heat flow per unit time

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Q. Mark the matter with least value of thermal conductivity

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

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

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Q. Identify the very good insulator

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Q. Most metals are good conductor of heat because of

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Q. Heat conduction in gases is due to

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

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Q. Cork is a good insulator because

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Q. Choose the false statement

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Q. What is the thermal conductivity of asphalt in W/m K?

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Q. Which one is having highest thermal conductivity?

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Q. What is the thermal conductivity of magnetite in W/m K?

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Q. Which one is having lowest thermal conductivity?

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