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. Obviate catalyst poisoning
- B. Maintain the reaction temperature
- C. Sustain the reactor pressure
- D. Hydrogenate the feed stock
Explanation: Hydrogen recycle maintains a high hydrogen partial pressure in the reformer, commonly described as sustaining reactor pressure and helping…
Correct answer: Sustain the reactor pressure- A. Oleophobic
- B. Oleophilic
- C. Both A. and B.
- D. Neither A. nor B.
Explanation: Electrical desalting removes water-soluble salts and other water-associated impurities from crude oil.
Correct answer: Oleophobic- A. Lubricating oils
- B. Kerosene
- C. Diesel
- D. LPG
Explanation: Aviation turbine fuel is essentially a kerosene-range fraction, with a boiling range between gasoline and diesel.
Correct answer: Kerosene- A. Lubricating oil
- B. Diesel
- C. Petrol
- D. Kerosene
Explanation: Aromatics are valued in petrol because their ring structures contribute strongly to octane number and anti-knock quality.
Correct answer: Petrol- A. Carnot
- B. Diesel
- C. Stirling
- D. CFR (Co-operative fuel research)
Explanation: Knocking quality is measured in a standardized Cooperative Fuel Research engine, commonly called a CFR engine.
Correct answer: CFR (Co-operative fuel research)- A. Benzol and ethylene dichloride
- B. Furfural
- C. Hexane
- D. Methyl ethyl ketone (MEK)
Explanation: The Barisol dewaxing process uses a mixed solvent of benzene, also called benzol, and ethylene dichloride to dissolve oil while…
Correct answer: Benzol and ethylene dichloride- A. Asphalt
- B. Sulphur compounds
- C. Wax
- D. Nitrogen compounds
Explanation: Sour crude contains appreciable hydrogen sulfide and other sulfur compounds, which cause corrosion and require additional treating.
Correct answer: Sulphur compounds- A. Sulphur
- B. None of these
- C. Oxygen
- D. Nitrogen
Explanation: Quinoline is a fused aromatic heterocycle containing one nitrogen atom, structurally related to naphthalene with a ring carbon replaced by…
Correct answer: Nitrogen- A. Decreases
- B. Decreases linearly
- C. Remains unchanged
- D. Increases
Explanation: Water introduces dissolved ionic salts into the crude-water mixture and creates a more conductive continuous pathway, so conductivity…
Correct answer: Increases- A. Straight run gasoline
- B. Platinum reformed gasoline
- C. Catalytical cracked gasoline
- D. Polymer gasoline
Explanation: Straight-run gasoline generally responds most strongly to tetraethyl lead because its low-octane paraffinic components gain more from lead…
Correct answer: Straight run gasoline- A. 3
- B. 300
- C. 3000
- D. 1000
Explanation: Historically, tetraethyl lead was added at roughly 1 to 4 cc per US gallon, so about 3 cc per gallon is the appropriate value.
Correct answer: 3- A. 0.1 to 0.5
- B. 7.5 to 12.5
- C. 1.5 to 4.5
- D. 15-20
Explanation: Although the bore of an oil well is only about 20 to 30 cm, its depth is commonly measured in kilometres.
Correct answer: 1.5 to 4.5- A. None of these
- B. Unsaturated cyclic compounds (hydrocarbons)
- C. Present in substantially good quantity in crude petroleum
- D. Saturated hydrocarbons
Explanation: Olefins are unsaturated hydrocarbons containing one or more carbon-carbon double bonds, and they are generally acyclic rather than cyclic.
Correct answer: None of these- A. Diesel increases its cetane number
- B. Petrol increases its octane number
- C. Kerosene increases its smoke point
- D. All A., B. and C.
Explanation: Aromatics raise the octane number of petrol because their molecular structures resist knocking.
Correct answer: Petrol increases its octane number- A. Saybolt viscometer
- B. Ramsbottom apparatus
- C. Pensky Martens apparatus
- D. Conradson apparatus
Explanation: The Pensky-Martens apparatus is used to determine the flash point of petroleum oils, commonly by a closed-cup method.
Correct answer: Pensky Martens apparatus- A. 5
- B. 15
- C. 25
- D. 35
Explanation: Crude petroleum commonly contains about 10 to 15 percent hydrogen by mass, with the remainder consisting mainly of carbon plus smaller…
Correct answer: 15- A. Heavy fuel oil
- B. Petrol
- C. Kerosene
- D. Naphtha
Explanation: Heavy fuel oil normally has a flash point above 66°C, making it safer to store than lighter fuels.
Correct answer: Heavy fuel oil- A. 1 to 5
- B. 30 to 80
- C. 250 to 350
- D. 450 to 500
Explanation: Vacuum distillation commonly operates at roughly 30 to 80 mm Hg absolute, reducing boiling temperatures and preventing excessive thermal…
Correct answer: 30 to 80- A. Is unpredictable
- B. Decreases
- C. Remain same
- D. Increases
Explanation: As the molecular size of aromatic compounds in kerosene increases, they form soot more readily during burning.
Correct answer: Increases- A. pH of the soil
- B. Bacterial action
- C. Heat
- D. Pressure
Explanation: Bacterial action, heat and pressure are commonly cited conditions controlling the transformation and maturation of organic matter into…
Correct answer: pH of the soil