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

Q. Log mean temperature difference (LMTD) cannot be used, if

View solution

Q. The critical radius 'r' of insulation on a pipe is given by

View solution

Q. As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the

View solution

Q. If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

View solution

Q. The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by

View solution

Q. __________ paint has the maximum absorption coefficient.

View solution

Q. Which of the following is unimportant in forced convection ?

View solution

Q. Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is

View solution

Q. In a multiple effect evaporator, the effect of boiling point elevation is to

View solution

Q. Dropwise condensation occurs on __________ surfaces.

View solution

Q. Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

View solution

Q. Trap is used to remove __________ from steam pipe lines.

View solution