Chemical Environmental Engineering

Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?

Byadmin March 11, 2019August 29, 2021

Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?

A. Highly
B. Moderately
C. Extremely
D. Very extremely

Chemical Environmental Engineering

Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?

Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?

A. Thermal power plant
B. Petroleum refinery
C. Nitric acid plant
D. Sulphuric acid plant

Read More Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
Chemical Environmental Engineering

80% less than 200 mesh size particles are called____________________?

80% less than 200 mesh size particles are called____________________?

A. Smoke
B. Powder
C. Grit
D. Aggregates

Read More 80% less than 200 mesh size particles are called____________________?
Chemical Environmental Engineering

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

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

A. Filtration
B. Coagulation
C. Sedimentation
D. Disinfection

Read More In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
Chemical Environmental Engineering

The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?

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

Read More The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?
Chemical Environmental Engineering

In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?

In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?

A. 1 to 2
B. 4 to 5
C. 9 to 10
D. 15 to 20

Read More In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?
Chemical Environmental Engineering

Septic tanks are used for the ______________ of the deposited solids?

Septic tanks are used for the ______________ of the deposited solids?

A. Separation
B. Anaerobic decomposition
C. Aerobic decomposition
D. None of these

Read More Septic tanks are used for the ______________ of the deposited solids?

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