Free Plant Design and Economics MCQs with Answers
803 Plant Design and Economics 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. 0.15
- B. 1.5
- C. 4.5
- D. 6.5
Explanation: A typical domestic refrigerator has a small refrigeration capacity, commonly around 0.1 to 0.25 ton of refrigeration.
Correct answer: 0.15- A. Biological oxygen pond
- B. Aerated lagoons
- C. Gravity separator having oil skimming devices
- D. Trickling filters
Explanation: Free oil floats because its density is lower than water, so it can be separated by gravity in an oil-water separator fitted with skimming…
Correct answer: Gravity separator having oil skimming devices3. Shouting by a man at his full voice corresponds to a voice level of about _____________ decibels?
- A. 25
- B. 50
- C. 80
- D. 120
Explanation: A person shouting at full voice produces approximately 80 dB of sound, far above ordinary conversation at about 60 dB.
Correct answer: 80- A. 1
- B. 3
- C. 7
- D. 20
Explanation: Carbon dioxide becomes acutely life-threatening at concentrations above roughly 20% by volume, causing severe oxygen displacement and…
Correct answer: 20- A. Methane
- B. All A., B. and C.
- C. Chlorofluoro carbons (CFC)
- D. Nitrous oxide
Explanation: Methane, nitrous oxide, and CFCs all absorb outgoing infrared radiation and therefore act as greenhouse gases.
Correct answer: All A., B. and C.- A. Remain constant
- B. Increases
- C. Decreases
- D. May increase or decrease; depends on the chemical characteristics of polluted water
Explanation: As water temperature rises, viscosity falls and particle collisions and floc formation generally improve, so less coagulant is usually…
Correct answer: Decreases- A. Global warming
- B. Ionosphere
- C. Atmospheric effect
- D. Green house
Explanation: A greenhouse allows incoming short-wave solar radiation to pass while restricting the escape of long-wave infrared radiation, causing heat…
Correct answer: Green house- A. Cancer
- B. Silicosis
- C. Respiratory disease (e.g., asthma)
- D. Reduced crop yield
Explanation: Carcinogenic hydrocarbons can damage cellular DNA and initiate uncontrolled cell growth, leading to cancer.
Correct answer: Cancer- A. Smog & ozone
- B. Hydrogen fluoride & nitrogen oxides
- C. Carbon monoxide
- D. Sulphur dioxide & spray of weed killers
Explanation: Carbon monoxide is highly toxic to humans because it binds haemoglobin, but it is generally not considered a major direct cause of…
Correct answer: Carbon monoxide- A. 100
- B. 1000
- C. 400
- D. 4000
Explanation: A 1,000-metre exclusion radius is the commonly cited planning buffer for hazardous or highly polluting chemical industries, with a green…
Correct answer: 1000- A. 20
- B. 60
- C. 90
- D. 120
Explanation: The commonly used maximum exposure limit for continuous occupational noise over an 8-hour shift is about 90 dBA.
Correct answer: 90- A. Coagulation
- B. Disinfection
- C. Sterilisation
- D. Sedimentation
Explanation: Disinfection destroys or inactivates disease-causing microorganisms in water, commonly using chlorine, ozone, or ultraviolet light.
Correct answer: Disinfection- A. Acidic
- B. Alkaline
- C. Neutral
- D. Highly acidic
Explanation: Fresh domestic sewage is commonly slightly alkaline, typically having a pH near 7 to 8.
Correct answer: Alkaline- A. 5
- B. 50
- C. 500
- D. 5000
Explanation: A commonly cited permissible or threshold concentration for sulphur dioxide in air is about 5 ppm, although modern ambient-air standards…
Correct answer: 5- A. 22
- B. 42
- C. 332
- D. 1050
Explanation: The historical water-supply limit listed for DDT in many chemical-engineering environmental tables is about 42 micrograms per litre.
Correct answer: 42- A. Electrostatic precipitator
- B. Scrubber
- C. Bag filter
- D. Cyclone separator
Explanation: Electrostatic precipitators are highly effective for collecting fine particulate matter because electrically charged particles migrate to…
Correct answer: Electrostatic precipitator- A. 25
- B. 50
- C. 70
- D. 85
Explanation: A quiet private office is typically around 50 decibels, whereas 70 dB is noticeably noisy and 85 dB approaches a level requiring…
Correct answer: 50- A. Radioactive rays
- B. Thermal pollution
- C. SPM
- D. Noise pollution
Explanation: Suspended particulate matter consists of physical particles and therefore has mass or weight.
Correct answer: SPM- A. Roentgen
- B. None of these
- C. Hertz
- D. Decibel
Explanation: Sound intensity or noise level is measured on the decibel (dB) scale. Hertz measures frequency, while roentgen measures ionising radiation…
Correct answer: Decibel- A. A combination of smoke and fog
- B. Nothing but black smoke
- C. A liquid particle resulting from vapor condensation
- D. A solid particle e.g. fly-ash
Explanation: The word smog combines smoke and fog, describing polluted air containing fine particles and droplets.
Correct answer: A combination of smoke and fogPlant Design and Economics MCQs: common questions
Are these Plant Design and Economics MCQs free?
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How many Plant Design and Economics MCQs are on this page?
There are 803 Plant Design and Economics MCQs in the Chemical Engineering bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Plant Design and Economics MCQ have an explanation?
Yes. Each Plant Design and Economics question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
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