03Environmental Engineering Quiz | MCQ | Practice Test #mcq

03 Environmental Engineering Quiz | MCQ | Practice Test

1 >>Which of the following is the most detrimental for water used in high pressure boiler ? ?

• (A) Silica
• (B) Turbidity
• (C) Phenol
• (D) Dissolved oxygen

Solution Silica

2 >>Presence of excess flourine in water causes ?

• (A) dental cavity
• (B) tooth decay
• (C) fluorosis
• (D) respiratory disease

Solution fluorosis

3 >>Turbidity of water is an indication of the presence of ?

• (A) suspended inorganic matter
• (B) dissolved solids
• (C) floating solids
• (D) dissolved gases

Solution suspended inorganic matter

4 >>Siderosis is a disease caused by the inhalation of __________ dust. ?

• (A) coal
• (B) silica
• (C) iron
• (D) none of these

Solution iron

5 >>Which of the following pollutants is not emitted during volcanic eruptions ? ?

• (A) SO2
• (B) H2S
• (C) CO
• (D) hydrocarbons

Solution hydrocarbons

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6 >>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.

Solution gravity separator having oil skimming devices.

7 >>Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by ?

• (A) chlorination
• (B) treating in biological oxygen pond
• (C) none of these
• (D) chemical coagulation

Solution treating in biological oxygen pond

8 >>Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ? ?

• (A) Dust catcher (gravity type)
• (B) Cyclone separator
• (C) Bag filter
• (D) Hollow wet scrubber

Solution Dust catcher (gravity type)

9 >>Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is ?

• (A) inversely proportional to viscosity of gas.
• (B) proportional to the viscosity & density of the gas.
• (C) proportional to the pressure of the gas.
• (D) both (b) and (c).

Solution both (b) and (c).

10 >>Dust collection efficiency of a cyclone separator depends upon its ?

• (A) diameter.
• (B) inlet gas velocity.
• (C) overall height.
• (D) all (a), (b) & (c).

Solution all (a), (b) & (c).

Environmental Engineering Quiz | Environmental Engineering MCQ

11 >>Ionisation potential employed in the industrial electrostatic precipitator is of the order of ?

• (A) 30 to 70 kV DC
• (B) 30 to 70 kV AC
• (C) 230 V AC
• (D) 230 V DC

Solution 30 to 70 kV DC

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12 >>The widest explosive limit is of __________ , thereby making it the most explosive gas. ?

• (A) acetylene
• (B) petrol vapor
• (C) hydrogen
• (D) carbon monoxide

Solution acetylene

13 >>Aerobic biological oxidation ponds used for the purification of polluted water ?

• (A) destroys/removes pathogen from the sewage.
• (B) is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents.
• (C) destroys/removes pathogen much more effectively if the sewage is chlorinated.
• (D) all (a), (b) & (c).

Solution all (a), (b) & (c).

14 >>Polluted water having low BOD are most economically treated in ?

• (A) sedimentation tanks
• (B) oxidation ponds
• (C) sludge digester
• (D) clarifier

Solution oxidation ponds

15 >>Tri-sodium phosphate is used in boiler water treatment to reduce ?

• (A) turbidity
• (B) caustic embrittlement
• (C) suspended silica
• (D) dissolved oxygen

Solution caustic embrittlement

16 >>The commonest form of iron & manganese found in ground water as pollutant is in the form of their ?

• (A) carbonates
• (B) bi-carbonates
• (C) chlorides
• (D) sulphides

Solution bi-carbonates

17 >>80% less than 200 mesh size particles are called ?

• (A) smoke
• (B) powder
• (C) grit
• (D) aggregates

Solution powder

18 >>Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?

• (A) by chemical coagulation.
• (B) in sedimentation tanks equipped with mechanical scrapper.
• (C) in vacuum filter.
• (D) in clarifiers.

Solution in sedimentation tanks equipped with mechanical scrapper.

19 >>Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes ?

• (A) blood poisoning.
• (B) anaemia.
• (C) nervous system disorder.
• (D) all (a), (b) and (c).

Solution all (a), (b) and (c).

20 >>TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm. ?

• (A) 0.1
• (B) 25
• (C) 100
• (D) 500

Solution 0.1