A. Dense structure
B. High proportion of air space
C. High specific heat
D. None of these
Low thermal conductivity of heat insulating materials is due to its_______________? Read More »
Chemical Heat Transfer A. Capacity of the evaporator is decreased
B. Capacity of the evaporator is increased
C. True temperature drop increases
D. Both B. and C.
A. Heating volume
B. Heat transfer area
C. Nusselt number
D. None of these
A. k/ρCp
B. ρCp/k
C. μCp/a
D. μ/hCp
Thermal diffusivity is given by__________________? Read More »
Chemical Heat Transfer A. Least at the inlet of the first effect
B. Least at the outlet of the last effect
C. Highest at the inlet of the last effect
D. Highest at the outlet of the last effect
In a forward feed multiple effect, the pressure build up will be____________________? Read More »
Chemical Heat Transfer A. Aluminium foil
B. Coal dust
C. Refractory bricks
D. Iron plates
Which of the following has the minimum absorptivity ? Read More »
Chemical Heat Transfer A. Fourier’s law
B. Newton’s law of cooling
C. Fick’s law
D. None of these
A. Always less than h1
B. Always between h1 and h2
C. Always higher than h2
D. Dependent on metal resistance
A. Flows through the tube
B. Flows outside the tubes
C. Can flow either inside or outside the tubes
D. Should not be used as it gives very high pressure drop
In an extended surface heat exchanger, fluid having lower co-efficient________________? Read More »
Chemical Heat Transfer A. r = 2k/h
B. r = k/h
C. r = k/2h
D. r = h/k
The critical radius ‘r’ of insulation on a pipe is given by____________________? Read More »
Chemical Heat Transfer