chemical engineering MCQs – Page 400

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
7981. Nitrogen oxides (NOx) is not produced in the ______________ industry?
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A. Nitrogenous fertiliser

B. Detergent

C. Any of these

D. Nitric acid making

7982. Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?
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A. 4.8

B. 0.2

C. 1.2

D. 0.002

7983. Dust collection efficiency of a cyclone separator depends upon its______________?
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A. Overall height

B. Diameter

C. Inlet gas velocity

D. All A., B. & C.
7984. World environment day is observed every year on the 5th of___________________?
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A. July

B. June

C. September

D. December

7985. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?
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A. With greater number of blades

B. Of increased diameter

C. Both A. & B.

D. Neither A. nor B.

7986. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels?
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A. 140

B. 120

C. 170

D. 200

7987. Which of the following radioactive wastes emits all ?, ? & ? rays and hence is the most hazardous of all radioactive emitters ?
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A. I-131

B. Sr-90

C. Ra-226

D. Au-198

7988. Presence of _____________ hardness is responsible for the temporary hardness in water?
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A. Sulphate

B. Carbonate

C. Calcium

D. Chloride

7989. Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings?
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A. Cadmium

B. Mercury

C. Hydrogen sulphide

D. Asbestos

7990. Industrial workers working in leather tanning & manufacturing units are prone to suffer from ___________________?
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A. Silicosis

B. Skin diseases (e.g. dermatitis)

C. Blurred vision

D. Respiratory ailments (e.g. bronchitis)

7991. In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
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A. Filtration

B. Disinfection

C. Coagulation

D. Sedimentation

7992. Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?
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A. Arsenic

B. Fluoride

C. Mercury

D. Lead

7993. Aerobic biological oxidation ponds used for the purification of polluted water__________________?
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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.
7994. A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system is______________?
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A. 3

B. 4

C. 6

D. 5

7995. One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is_________________?
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A. 10373

B. 4988.4

C. 30554

D. 4364.9

7996. Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes________________?
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A. All A., B. and C.

B. Blood poisoning

C. Nervous system disorder

D. Anaemia

7997. When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?
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A. 0.01

B. 0.1

C. 1

D. 4
7998. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes____________________?
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A. Reduced crop yield

B. Respiratory disease (e.g., asthma)

C. Silicosis

D. Cancer
7999. In large thermal power stations very fine particulates present in flue gas are removed by___________________?
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A. Wet scrubber

B. Electrostatic precipitators

C. Dust catcher

D. Bag filter

8000. TLV of mercury in potable (drinking) water is about ______________ ppm?
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A. 1

B. 0.1

C. 0.001

D. 5