Related Questions

Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation
A Increases capacity
B Increases economy
C Does not affect the capacity
D Both B & C
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
A Painting the surface black
B Painting the surface white (with aluminium paint)
C Giving the surface a mirror finish
D Roughening the surface
Under the same conditions, which of the following shapes of water surface will give the highest rate of evaporation ?
A flat water surface
B convex water surface
C concave water surface
D independent of shape of water surface
A container holds 4 quarts of chemical and 4 quarts of water. How many quarts of water must be added to the container to create a mixture that is 3 parts chemical to 5 parts water by volume?
A 4/3
B 5/3
C 7/3
D 8/3
The suitable conditions in which the rate of evaporation occurs more fastly are
A Low speed of wind
B High humidity
C Low humidity and high temperature
D Excess amount of water in the soil
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
A Remain horizontal
B Slant up towards direction of pull
C Slant down towards direction of pull
D None of the above
Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is
A 0
B 1
C ∞
D None of these
Equivalent evaporation is the amount of water evaporated in a boiler from and at
A 0°C
B 100°C
C Saturation temperature at given pressure
D Room temperature
Only small amount of evaporation of water produces large cooling effects because of its
A Large latent heat
B Low viscosity
C Small latent heat
D None of these
'Utilities' in a chemical process plant includes compressed air, steam, water, electrical power, oxygen, acetylene, fuel gases etc. Utility costs for ordinary chemical process plants ranges roughly from __________ percent of the total product cost.
A 1 to 5
B 10 to 20
C 25 to 35
D 35 to 45

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