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Heat Transfer

Q1: Pick out the wrong statement.

A Heat transfer by radiation can not occur across an absolute volume.

B In case of a shell and tube heat exchanger, the pressure drop through the shell is proportional to the number of times the fluid crosses the bundle between baffles.

C Propagation velocity for travel of heat radiation through vacuum is equal to the velocity of the light.

D The amount of heat involved in the condensation or vaporisation of 1 kg of a fluid is the same.

ANS:A - Heat transfer by radiation can not occur across an absolute volume.

The wrong statement is: "The amount of heat involved in the condensation or vaporization of 1 kg of a fluid is the same." In reality, the amount of heat involved in the condensation or vaporization of a fluid depends on the specific substance and its phase change properties. Different substances have different latent heat values, which represent the amount of heat required to change one unit of mass from one phase to another at constant temperature and pressure. Therefore, the amount of heat involved in condensation or vaporization can vary significantly depending on the substance.

 



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