chemical engineering MCQs – Page 398

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 Review each marked answer and report any item that may be outdated or unclear.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

7941. The progressive warming up of the earths surface is mainly due to the___________________?
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A. Blanketing effect of CO2 in the atmosphere

B. De-forestation

C. Automobile exhaust

D. Thickening of ozone layer

7942. Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is________________?
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A. None of these

B. 1

C. 0

D. ?

7943. Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for___________________?
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A. Conversion of NOx into N2 and NH3 in the first compartment

B. All A., B. and C.

C. Conversion of CO into CO2 in the second compartment

D. Oxidation of unburnt hydrocarbon fuel in the second compartment

7944. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________?
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A. All A., B. & C.

B. Blood poisoning

C. Nervous system disorder

D. Anaemia

7945. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?
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A. None of these

B. Ionosphere

C. Troposphere

D. Stratosphere

7946. Presence of high concentration of ozone and smog in atmospheric air causes the __________________?
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A. Embrittlement & decrease of folding resistance of paper

B. Cracking of rubber products

C. Fading of dye on textiles

D. Damage of electrical insulator on high tension power line

7947. Carbon monoxide is a pollutant, which causes_________________?
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A. Asphyxiation (suffocation) leading to death

B. Damage to building materials like marble

C. Retardation in crop growth

D. Respiratory disease (e.g. asthma)

7948. As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is _____________ ?g/m3.(?g-microgram)?
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A. 750

B. 10

C. 90

D. 800

7949. Pick out the correct statement ?
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A. COD is related to BOD of a given waste in water but the relationship varies for different

B. hromate in cone, sulphuric acid solution at boiling temperature for specified time

C. tes. Typically COD of potable water may be 1-2 mg/litre

D. Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present

E. water

F. COD is determined by oxidising the organic matter present in water with potassium

7950. In troposphere (the weather domain), the temperature t at height h above the spa level in metres is given by (where, temperature at sea level is 15C and t is in C ?
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A. t = 15 + 0.0065h

B. t = 0.0035h -15

C. t = 15 0.0065h

D. t = 15 0.0035h

7951. Ionisation potential employed in the industrial electrostatic precipitator is of the order of_______________?
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A. 230 V DC

B. 230 V AC

C. 30 to 70 kV AC

D. 30 to 70 kV DC

7952. For an isothermal process, the internal energy of a gas____________________?
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A. Increases

B. Data insufficient, cant be predicted

C. Decreases

D. Remains unchanged

7953. Which of the following processes is involved in the biochemical treatment of sewage effluents ?
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A. Reduction

B. Fermentation

C. Dehydration

D. Oxidation

7954. Particulates (< 1?m size) remaining suspended in air indefinitely and transported by wind currents are called_________________?
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A. Fumes

B. Smoke

C. Aerosols

D. Mists

7955. TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?
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A. 100

B. 2000

C. 1000

D. 5

7956. 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) ?
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A. Biological oxidation pond

B. Chemical coagulation

C. Lagooning

D. Activated carbon adsorption

7957. Growth of ______________ is promoted by the presence of manganese in water?
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A. Files

B. Micro-organisms

C. Algae

D. Mosquitoes

7958. Green house effect is accentuated by________________?
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A. Deforestation

B. Increased transportation activity

C. Rapid industrialisation

D. All A., B. and C.

7959. Hydrogen ion concentration in distilled water is___________________?
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A. 10-7

B. 7 10-7

C. 7 107

D. 107

7960. Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the_______________?
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A. Vegetation

B. Green house effect

C. Forestation

D. Rain

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