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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

The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?
A 10
B 200
C 1000
D 2000
Correct Answer: 200
Which of the following processes is involved in the biochemical treatment of sewage effluents ?
A Oxidation
B Reduction
C Dehydration
D Fermentation
Correct Answer: Oxidation
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?
A Biological oxygen pond
B Aerated lagoons
C Trickling filters
D Gravity separator having oil skimming devices
Correct Answer: Gravity separator having oil skimming devices
Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels?
A 85
B 105
C 125
D 145
Correct Answer: 105
Presence of ____________ in water stream are deleterious to aquatic life?
A Soluble and toxic organics
B Suspended solids
C Heavy metals and cyanides
D All A., B. & C.
Correct Answer: All A., B. & C.
Tolerable limit of nitrogen oxides in air is _____________ ppm?
A 0.1
B 1
C 5
D 25
Correct Answer: 5
BOD of raw municipal sewage may be in the range of about _____________ mg/litre?
A 1-2
B 5-10
C 150-300
D 2000-3000
Correct Answer: 150-300
Iron & manganese present in the polluted water is removed by __________________?
A Simple filtration
B Oxidation followed by settling & filtration
C Chemical coagulation
D Chlorination only
Correct Answer: Oxidation followed by settling & filtration
TLV of aldrin in public water supply system is about ____________ μg/litre?
A 0.5
B 17
C 357
D 1097
Correct Answer: 17
Aerobic biological oxidation ponds used for the purification of polluted water__________________?
A Destroys/removes pathogen from the sewage
B Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents
C Destroys/removes pathogen much more effectively if the sewage is chlorinated
D All A., B. & C.
Correct Answer: All A., B. & C.
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