Q. Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because

View solution

Q. Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow. )

View solution

Q. Temperature profile in steady state heat transfer is

View solution

Q. Which area is used in case of heat flow by conduction through a cylinder ?

View solution

Q. Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

View solution

Q. The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is

View solution

Q. Finned tube heat exchangers

View solution

Q. The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.

View solution

Q. A perfect black body is a perfect __________ of radiation.

View solution

Q. In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.

View solution

Q. An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

View solution

Q. Which of the following is directly concerned with the heat transfer ?

View solution

Q. Pick out the wrong statement:

View solution

Q. Heat transfer by __________ may not necessarily require the presence of a medium.

View solution

Q. Pick out the correct statement.

View solution

Q. In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used

View solution

Q. Stefan-Boltzman law applies to __________ body.

View solution

Q. The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

View solution

Q. Planck's distribution law is valid for __________ bodies.

View solution

Q. For hot feed, forward feeding as compared to backward feeding results in __________ economy.

View solution