4754Chemical EngineeringMedium
Which of the following is a secondary air pollutant?
ANitrogen dioxide
BPhotochemical smog
CSulphur dioxide
DDust particles
Correct answer
B. Photochemical smog
Explanation
The correct answer is Photochemical smog.
Correct answer
B. Photochemical smog
Explanation
The correct answer is Photochemical smog.
It is not preferable to use superheated steam in evaporators, because of its very________?
The second order system with the transfer function 4/(s2 + 2s + 4) has a damping ratio of ________?
In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer coefficient (hi) vanishes after a Reynold number of________?
Grashoff number, which is defined as g. β (Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to ________ force?
For the production of very high vacuum, a ________ pump is normally used?
Spalling resistance of a refractory cannot be increased by ________?