11. The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is
12. The purpose of providing expansion bellows in the shell of tubular exchanger is to
13. Nusselt number is the ratio of the
14. Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?
15. Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for
16. In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is
17. The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is
18. The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.
19. Log mean temperature difference (LMTD) cannot be used, if
20. Multiple effect evaporation is generally recommended, when the
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