Q. An oil cooler in a high performance engine has an outside surface area 0.12 m² and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m² K. Find out the heat transfer rate?

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Q. Unit of rate of heat transfer is

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Q. Convective heat transfer coefficient doesn’t depend on

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Q. The rate equation used to describe the mechanism of convection is called Newton’s law of cooling. So rate of heat flow by convection doesn’t depend on

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Q. How many types of convection process are there?

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Q. Thermal conductivity is maximum for which substance

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Q. A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body

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Q. Which of the following is an example of forced convection?

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Q. Regarding one dimensional heat transfer, choose the correct statement

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Q. Which statement is true regarding steady state condition?

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Q. Which of the following is an example of steady state heat transfer?

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Q. Heat transfer in a long, hollow cylinder which is maintained at uniform but different temperatures on its inner and outer surfaces may be assumed to be taking place in which direction?

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Q. Heat transfer takes place according to which law?

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Q. Heat transfer takes place in liquids and gases is essentially due to

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Q. The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by

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Q. Identify the wrong statement.

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Q. During a cold winter season, a person prefers to sit near a fire. Which of the following modes of heat transfer provides him the maximum heat?

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Q. Most unsteady heat flow occurs

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Q. During the unfolding reaction of a helix, breakage of each hydrogen bond requires about 2kJ/mol. This implies hydrogen bonds are

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Q. If the enthalpy change for a reaction is zero, ΔG° is equal to

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