chemical engineering MCQs – Page 394

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 Review each marked answer and report any item that may be outdated or unclear.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
7861. Main pollutants released from petroleum refineries is__________________?
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A. CO2, H2S & NO2

B. SO3, NO2 & CO2

C. CO2, NO & SO3

D. CO, SO2 & H2S
7862. The pH value of oxidised sewage is about_____________________?
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A. 13.4

B. 1.8

C. 7.3

D. 6.2

7863. Iron & manganese present in the polluted water is removed by __________________?
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A. Chlorination only

B. Chemical coagulation

C. Oxidation followed by settling & filtration

D. Simple filtration

7864. A solid is transformed into vapour without going to the liquid phase at_________________?
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A. Triple point

B. Below triple point

C. Boiling point

D. Always

7865. Pick out the one which is not a chemical coagulant ?
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A. Hydrated lime

B. Ferrous sulphate

C. Chloramine

D. Aluminium sulphate

7866. The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?
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A. May increase or decrease; depends on the chemical characteristics of polluted water

B. Increases

C. Decreases

D. Remain constant

7867. The earths atmosphere is an envelope of gases present upto a height of about ______________ kms?
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A. 2000

B. 200

C. 1000

D. 10

7868. Insufficient washing of sand grains in a rapid sand filter causes__________________?
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A. Shrinkage of filtering media

B. Expansion of filtering media

C. Mud balls

D. Air binding

7869. The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?
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A. CO2

B. CH4

C. CO

D. H2

7870. Siderosis is a disease caused by the inhalation of ______________ dust?
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A. Iron

B. None of these

C. Silica

D. Coal

7871. . Operating principle of cyclone separator is based on the action of _______________ dust particles?
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A. Gravitational force on

B. Diffusion of

C. Centrifugal force on

D. Electrostatic force on

7872. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?
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A. Gravity separator having oil skimming devices

B. Trickling filters

C. Aerated lagoons

D. Biological oxygen pond

7873. Which of the following is a secondary air pollutant ?
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A. Nitrogen dioxide

B. Photochemical smog

C. Dust particles

D. Sulphur dioxide

7874. Radioactive substances present in the polluted water stream can be removed by_________________?
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A. Biological oxygen treatment

B. Coagulation and filtration

C. Adsorption in ion exchange materials

D. None of these

7875. Ideal gas law is applicable at____________________?
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A. Low T, low P

B. Low T, high P

C. High T, low P

D. High T, high P

7876. Carbonaceous particles having size less than 1 ?m are called___________________?
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A. s

B. Smoke

C. Grit

D. Aggregates

7877. Polyvinyl chloride containers are not suitable for storing_________________?
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A. Metallic powder

B. Woolen clothes

C. None of these

D. Foodstuffs
7878. The shape of T-S diagram for Carnot Cycle is a__________________?
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A. Rhombus

B. Trapezoid

C. Circle

D. Rectangle
7879. Water filtration rate in a rapid sand filter ranges from ______________ kilolitres/m2/hr?
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A. 10 to 15

B. 15 to 20

C. 0.1 to 1

D. 3 to 6
7880. Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases?
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A. Reduce SO2 content in

B. None of these

C. Catalytically convert SO2 to SO3 in

D. Increase the dew point of