Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________________?
Correct answer: A. Grit
- A. Grit
- B. Dust
- C. Powder
- D. Smoke
Explanation
In the usual industrial air-pollution classification, particles larger than about 75 micrometres are termed grit, while finer particles are commonly classified as dust or fume. The parenthetical conversion is misstated, since 1 micrometre equals 10^-3 mm, not 10^-6 mm.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Chemical Process Principles
2,710 free Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Chemical Process Principles questions
Inhalation of silica dust causes a disease called__________________?
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
Main pollutants released from iron & steel industry is__________________?
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
Removal of ______________ is accomplished by aeration of water?
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?