chemical engineering MCQs – Page 391

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 Review each marked answer and report any item that may be outdated or unclear.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
7801. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?
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A. Causes asphyxia

B. Acts as a green house gas thereby raising earths temperature

C. Enhances the green house effect

D. Causes increase in sea level

7802. A body which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the________________?
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A. Ionosphere

B. Global warming

C. Green house

D. Atmospheric effect

7803. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ______________ ppm?
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A. 10000 to 100000

B. 1000 to 2000

C. 6000 to 9000

D. 3000 to 6000

7804. Biological oxidation ponds remove organic matters present in the polluted water by _______________?
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A. Using the activities of bacteria and other micro organisms

B. Aerobic oxidation

C. Both A. & B.

D. Neither A. nor B.

7805. Photochemical smog is formed from automobile exhaust ________________?
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A. Appears only on sunny days

B. By reaction of hydrocarbon & nitric oxide in presence of sunlight

C. Is harmful for crops and trees also besides causing eye irritation & asthma

D. All A., B. & C.
7806. Exposure to SO2 containing chimney gases results in the__________________?
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A. Reduction in strength of leather & cloth

B. Acceleration of corrosion rates of metals

C. Increased drying & hardening time of paints

D. All A., B. and C.
7807. The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x1. x2, where A is a constant. The corresponding equation for ln y1, where y1 is the activity co-efficient of component 1, is__________________?
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A. Ax2

B. Ax12

C. Ax1

D. A . x22
7808. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels?
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A. 95

B. 140

C. 75

D. 120

7809. Presence of soluble organics in polluted water causes_________________?
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A. Fire hazards

B. Depletion of oxygen

C. Undesirable plants growth

D. Explosion hazards

7810. Particles having diameter greater than 75 ?m (micrometer = 10-6 mm) are called__________________?
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A. Powder

B. Smoke

C. Grit

D. Dust

7811. Pneumoconiosis is a disease caused by the inhalation of ______________ dust?
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A. Uranium ore

B. Coal

C. Lime

D. Iron ore

7812. The lowest layer of atmosphere is known as the_____________________?
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A. None of these

B. Stratosphere

C. Ionosphere

D. Troposphere
7813. Noise level inside a jet airliner in normal flight is about ______________ decibels?
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A. 100

B. 125

C. 80

D. 150

7814. Presence of bacteria in potable (drinking) water causes_________________?
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A. Bad taste & colour

B. Turbidity

C. Bad odour

D. Disease
7815. The resistance of water to the passage of light through it is a measure of the___________________?
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A. Hardness

B. Dissolved gases

C. Turbidity

D. Color

7816. The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the_________________?
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A. Statement of Vant Hoff Equation

B. Le-Chateliers principle

C. Lewis-Randall rule

D. None of these
7817. COD of raw municipal sewage may be in the range of about _____________ mg/litre?
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A. 90-120

B. 2-Jan

C. 1500-2500

D. 10-May

7818. Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundries causes___________________?
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A. Shortness of breath

B. All A., B. and C.

C. Asphyxiation (suffocation)

D. Tuberculosis

7819. Aerosols present in atmospheric air may be__________________?
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A. Combination of all A., B. & C.

B. Negatively charged

C. Positively charged

D. Neutral

7820. In the context of the chemical process industries, the term BOD is normally associated with the_____________________?
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A. Organic concentration in gaseous effluents

B. Characterisation of solid wastes

C. Characterisation of liquid effluents

D. Characterisation of boiler feed water