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Gearup-JE'19: Heat Transfer Quiz-1

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Question 1

Inspite of large heat transfer coefficients in boiling liquids, fins are used advantageously when the entire surface is exposed to _______.

Question 2

Minimum thermal diffusivity is of ___________.

Question 3

When the temperature of a solid surface changes from 127 °C to 927 °C, the ratio of emissive power final to initial will be

Question 4

Heat is transferred from an insulated pipe to the surrounding still air by ______.

Question 5

Which among the following heat transfer method refers to transferring of heat which occurs among surface and moving fluid when they are at different temperatures?

Question 6

Determine the mass flow rate of the water entering the radiator of an automobile at 370K and leaves at 300K. The air in cross flow enters at 0.62 kg/s, cools the water and leaves at 270 K. If heat transfer rate is 14.732 kW, and take specific heat = 4209 J/kgK.

Question 7

For air near atmospheric condition, the ratio of thermal boundary layer to hydrodynamic boundary layer is ____________.

Question 8

Which of the following option is correct?
where, HBL & TBL stands for Hydrodynamic & Thermal Boundary Layer respectively
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