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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
A By chemical coagulation
B In sedimentation tanks equipped with mechanical scrapper
C In vacuum filter
D In clarifiers
Correct Answer: In sedimentation tanks equipped with mechanical scrapper
Removal of ______________ is accomplished by aeration of water?
A Dissolved gases
B Suspended solids
C Dissolved solids
D None of these
Correct Answer: Dissolved gases
Which of the following pollutants, if present in atmosphere is detectable by its odour ?
A CO
B SO2
C NO2
D CO2
Correct Answer: SO2
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) ?
A Lagooning
B Activated carbon adsorption
C Biological oxidation pond
D Chemical coagulation
Correct Answer: Activated carbon adsorption
Pick out the correct statement ?
A Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present
B COD is determined by oxidising the organic matter present in water with potassium
C COD is related to BOD of a given waste in water but the relationship varies for different
D All A., B. and C.
Correct Answer: All A., B. and C.
When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?
A 0.01
B 0.1
C 1
D 4
Correct Answer: 4
Which is the most practical and economical method for removal of suspended solid matter from polluted water ?
A Sedimentation
B Skimming off
C Chlorination
D Biological oxidation
Correct Answer: Sedimentation
Iron & manganese present as pollutant in water cannot be removed by__________________?
A Ion exchange process
B Oxidation followed by settling & filtration
C Lime soda process or manganese zeolite process
D Chlorination
Correct Answer: Chlorination
In the context of the chemical process industries, the term BOD is normally associated with the_____________________?
A Characterisation of solid wastes
B Organic concentration in gaseous effluents
C Characterisation of liquid effluents
D Characterisation of boiler feed water
Correct Answer: Characterisation of liquid effluents
Pick out the wrong statement pertaining to ‘green house’ for the plants ?
A ‘Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation
B The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed
C ‘Green house effect’ in earth’s atmosphere is due to increasing CO2 level in atmosphere, where
D ‘Green house’ is colder than the outside atmosphere
Correct Answer: ‘Green house’ is colder than the outside atmosphere
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