Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Bog iron
- B. Limestone powder or alkalised alumina
- C. Silica gel
- D. Active carbon
Explanation: Alkalised alumina provides an alkaline surface that adsorbs acidic SO₂, while limestone can also capture it by reaction to form calcium…
Correct answer: Limestone powder or alkalised alumina- A. Underground burial in concrete containers
- B. Pathological incineration
- C. Pyrolysis
- D. High temperature incineration
Explanation: Radioactive solids cannot be safely destroyed by ordinary incineration or pyrolysis because their radioactivity remains.
Correct answer: Underground burial in concrete containers- A. 84
- B. 88
- C. 80
- D. 92
Explanation: Normal air contains about 21% oxygen, but when nitrogen raises the total inert-gas fraction to about 84%, oxygen falls to roughly 16%…
Correct answer: 84- A. Files
- B. Algae
- C. Micro-organisms
- D. Mosquitoes
Explanation: Manganese in water can support the growth of manganese-oxidising microorganisms, which may form deposits and slimes in water systems.
Correct answer: Micro-organisms- A. 1.8
- B. 6.2
- C. 7.3
- D. 13.4
Explanation: After biological oxidation and stabilisation, sewage is generally close to neutral, with a typical pH around 7.3.
Correct answer: 7.3- A. Tanneries
- B. Beverages
- C. Glass & ceramic
- D. Any of these
Explanation: Arsenic pollution is associated with industries such as tanning and glass or ceramic manufacture, where arsenic compounds may occur in…
Correct answer: Beverages- A. Grinding
- B. Machining
- C. Polishing
- D. Cutting
Explanation: Metal grinding, machining and cutting can fracture or remove metal and generate airborne particulate matter.
Correct answer: Polishing- A. Hydrocarbons
- B. CO2
- C. NO
- D. CO
Explanation: Incomplete combustion in spark-ignition automobile engines produces carbon monoxide, making CO the characteristic major pollutant in…
Correct answer: CO- A. Preheating of feed water
- B. Eliminating H2S in feed water
- C. Keeping the pH value of feed water just below 7
- D. Reduction in hardness, silica & alumina in feed water
Explanation: Boiler scale forms mainly from hardness salts and deposits involving silica and alumina, so these species must be reduced in the…
Correct answer: Reduction in hardness, silica & alumina in feed water- A. 120
- B. 140
- C. 170
- D. 200
Explanation: A jet engine operating with an afterburner produces an exceptionally intense sound level, commonly estimated at about 170 dB at a 100 m…
Correct answer: 170- A. Turbidity
- B. Bad odour
- C. Disease
- D. Bad taste & colour
Explanation: Disease-causing bacteria make drinking water unsafe by introducing pathogens that can cause illnesses such as cholera, typhoid and…
Correct answer: Disease- A. 0.1
- B. 25
- C. 100
- D. 1000
Explanation: The threshold limit value for both ozone and phosgene is about 0.1 ppm because both are highly toxic inhalation hazards.
Correct answer: 0.1193. Radioactive substances present in the polluted water stream can be removed by_________________?
- A. Adsorption in ion exchange materials
- B. Coagulation and filtration
- C. Biological oxygen treatment
- D. None of these
Explanation: Radioactive ions in wastewater can be captured by ion-exchange materials, which replace the dissolved radioactive ions with harmless…
Correct answer: Adsorption in ion exchange materials- A. Silica gel
- B. Bog iron
- C. Active carbon
- D. Limestone powder
Explanation: Bog iron, containing hydrated iron oxides, removes hydrogen sulfide by reacting with or fixing sulfide on the iron-bearing material.
Correct answer: Bog iron- A. 1
- B. 10
- C. 250
- D. 1000
Explanation: The traditional permissible turbidity limit stated for potable water in such process-environment texts is 10 ppm.
Correct answer: 10- A. Blood poisoning
- B. Anaemia
- C. Nervous system disorder
- D. All A., B. & C.
Explanation: Inhaled lead compounds can produce systemic blood poisoning, interfere with haemoglobin formation and cause anaemia, and damage the…
Correct answer: All A., B. & C.- A. SO2
- B. Hg
- C. NOx
- D. F
Explanation: Sulfur dioxide is commonly emitted when sulfur-containing fuels or ores are burned or roasted, making it characteristic of smelters and…
Correct answer: SO2- A. Smoke
- B. Powder
- C. Grit
- D. Aggregates
Explanation: Material of which about 80% passes a 200-mesh screen is classified as a powder, indicating a relatively fine particle size.
Correct answer: Powder- A. Suppression of noise at the source itself
- B. Path control of noise
- C. All A., B. & C.
- D. Protection of operating personnel
Explanation: Noise control follows three approaches: reduce noise at its source, interrupt or enclose its transmission path, and protect workers with…
Correct answer: All A., B. & C.- A. Arizona (U.S.A.)
- B. Moscow (U.S.S.R.)
- C. Pennsylvania (U.S.A.)
- D. Chernobyl (undivided U.S.S.R.)
Explanation: The Chernobyl reactor accident in 1986 released a vast amount of radioactive material across the former U.S.S.R.
Correct answer: Chernobyl (undivided U.S.S.R.)