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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1521. Concentration of a solution expressed in terms of _______________ is independent of temperature?
- A. Molarity
- B. Normality
- C. Molality
- D. None of these
Explanation: Molality is based on moles of solute per unit mass of solvent, and mass does not change with temperature.
Correct answer: Molality- A. 0.4
- B. 0.5
- C. 0.6
- D. 0.7
Explanation: The 1 kg feed contains 0.12 kg solids, which remain in the product. At 40% solids, the final product mass is 0.12/0.40 = 0.30 kg, so water…
Correct answer: 0.7- A. Bulk modulus
- B. Poisson's ratio
- C. Modulus of elasticity
- D. Shear modulus
Explanation: Poisson’s ratio is defined as the ratio of lateral strain to longitudinal or linear strain, usually taken with a sign convention that…
Correct answer: Poisson's ratio- A. Precipitate wax
- B. Dissolve wax
- C. Depress its pour point
- D. Remove wax
Explanation: Chemical additives act as pour-point depressants by hindering the growth and network formation of wax crystals, so the crude remains…
Correct answer: Depress its pour point- A. Adsorption refining operation
- B. Fuel gas manufacture
- C. Iron ore reduction
- D. Carbon electrode manufacture
Explanation: Petroleum coke is a high-carbon material commonly used to manufacture carbon and graphite electrodes, especially for electric-arc…
Correct answer: Carbon electrode manufacture- A. Paraffins
- B. Naphthenes
- C. Aromatics
- D. Iso-paraffins
Explanation: Paraffins generally have the lowest smoking tendency among the listed hydrocarbon families, while aromatic rings strongly promote soot…
Correct answer: Paraffins- A. Gum & sulphur content
- B. Viscosity
- C. Octane number
- D. Reid vapor pressure
Explanation: Gasoline viscosity is relatively unimportant because it is already a low-viscosity fuel and is not normally used as its principal quality…
Correct answer: Viscosity- A. From oil wells
- B. In oil refineries
- C. None of these
- D. By natural gas stripping
Explanation: Natural gasoline is the liquid hydrocarbon fraction recovered from natural gas, commonly by absorption or refrigeration and stripping…
Correct answer: By natural gas stripping- A. 2
- B. -40
- C. 30
- D. 55
Explanation: The standard volatility specification for LPG places the 95% evaporated temperature near 2°C at atmospheric pressure.
Correct answer: 2- A. i-paraffins
- B. Aromatics
- C. n-paraffins
- D. Naphthenes
Explanation: Aromatics are undesirable in kerosene because they give a low smoke point and produce smoky flames, although they can improve some solvent…
Correct answer: Aromatics- A. Paraffins
- B. Aromatics
- C. Diolefins
- D. Naphthenes
Explanation: Diolefins contain two double bonds, making them highly reactive toward oxidation and polymerisation, so they form gum readily in gasoline.
Correct answer: Diolefins- A. 50 atm. and 150°C
- B. 1 atm. & 110 °C
- C. 20 kgf/cm2 & 110°C
- D. 6.5 kgf/Cm2 & 95°C
Explanation: Electrical dehydrators commonly operate at elevated pressure and around 95°C to keep crude oil sufficiently fluid while an electric field…
Correct answer: 6.5 kgf/Cm2 & 95°C- A. Diesel
- B. Kerosene
- C. Furnace oil
- D. Petrol
Explanation: Petrol is the lightest of the listed petroleum products and therefore has the lowest specific gravity and highest °API gravity.
Correct answer: Petrol1534. Deoiling is the process of removal of oil from wax. It is done by the _______________ process?
- A. Solvent extraction
- B. All A., B. & C.
- C. Resettling
- D. Sweating
Explanation: Wax can be deoiled by solvent extraction, sweating, or resettling, depending on the refinery process and wax quality.
Correct answer: All A., B. & C.- A. Nitrogen decreases
- B. Sulphur decreases
- C. Sulphur increases
- D. None of these
Explanation: Sulphur-containing compounds are concentrated progressively in the less volatile, heavier fractions during atmospheric distillation.
Correct answer: Sulphur increases- A. Primary
- B. Fossil
- C. Secondary
- D. Both A. & B.
Explanation: Crude petroleum is a primary fuel because it occurs naturally and is extracted directly, and it is also a fossil fuel because it formed…
Correct answer: Both A. & B.- A. Hydrocarbon content type (aromatic or paraffinic)
- B. Degree of refinement
- C. Ease of atomisation
- D. Sulphur content
Explanation: Specific gravity helps indicate the hydrocarbon character of a petroleum product, since paraffinic, naphthenic and aromatic hydrocarbons…
Correct answer: Hydrocarbon content type (aromatic or paraffinic)- A. Methyl ethyl ketone & glycol
- B. Propane & phenol-cresol mixture
- C. Phenol & furfural
- D. Propane & liquid sulphur dioxide
Explanation: Duo-sol extraction uses a two-solvent system consisting of liquid propane and a phenol-cresol solvent mixture.
Correct answer: Propane & phenol-cresol mixture- A. Catalytic cracking
- B. Hydrocracking
- C. Dehydrogeneration of Naphthene to produce aromatic
- D. Catalytic polymerisation
Explanation: Dehydrogenation of naphthenes to aromatics is endothermic because hydrogen is removed and energy is required to form the aromatic…
Correct answer: Dehydrogeneration of Naphthene to produce aromatic- A. 1-5 Kgf/cm2 & 200°C
- B. 5-10 kgf/cm2 & 150 - 250°C
- C. 50 - 75 kgf/cm2 & 600 - 800°C
- D. 15-45 Kgf/cm2 & 450-550°C
Explanation: Catalytic reforming uses high temperatures, commonly about 450 to 550°C, and moderate-to-high pressures in the range of roughly 15 to 45…
Correct answer: 15-45 Kgf/cm2 & 450-550°C