Q. Which type of heat exchanger is preferred for heavy heat loads ?

View solution

Q. Pick out the wrong statement.

View solution

Q. While the total emissivity of a perfect black body is unity, the same for a real body is

View solution

Q. In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.

View solution

Q. For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would

View solution

Q. In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

View solution

Q. For what value of Prandtl number, the Col-burn analogy is valid ?

View solution

Q. In a forward feed multiple effect, the pressure build up will be

View solution

Q. Film boiling occurs at __________ pressure.

View solution

Q. Heat flux through several resistances in series in analogous to the current flowing through several

View solution

Q. Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

View solution

Q. Vacuum is generally maintained in the vapour space of an evaporator mainly to

View solution

Q. Double pipe heat exchangers are used

View solution

Q. Steam traps are provided in steam carrying pipelines to

View solution

Q. A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an

View solution

Q. Radiation heat transfer rates does not depend upon the

View solution

Q. Which of the following is correct ?

View solution

Q. Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

View solution

Q. As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

View solution

Q. Heat transfer rate per unit area is called

View solution