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. 4
- B. 6
- C. 8
- D. 12
Explanation: In a simple cubic lattice, each atom touches four neighbors in its own plane, plus one directly above and one below.
Correct answer: 6- A. 9.5 : 1
- B. 12.5 : 1
- C. 15.5 : 1
- D. 18.5 : 1
Explanation: Methane requires 2 mol of oxygen per mole: CH₄ + 2O₂ → CO₂ + 2H₂O. Since air contains about 4.76 mol of air per mole of oxygen, the…
Correct answer: 9.5 : 1- A. Cresylic acid
- B. Xanthaies
- C. Pine oil
- D. All A, B. & C.
Explanation: Pine oil and cresylic acid are common frothers that stabilise the froth.
Correct answer: Xanthaies- A. Better finish and surface appearance
- B. High flexibility
- C. Low impact strength
- D. High plastic deformation
Explanation: Crystalline polymers generally have greater stiffness and strength but lower flexibility and impact resistance than amorphous polymers.
Correct answer: Low impact strength- A. High % of CO in
- B. High temperature of
- C. Low temperature of
- D. High % of CO2 in
Explanation: Incomplete combustion does not oxidise all carbon to carbon dioxide, so the exhaust contains an elevated concentration of carbon monoxide.
Correct answer: High % of CO in- A. Eutectic temperature
- B. Recrystallisation temperature
- C. Lower critical temperature
- D. Upper critical temperature
Explanation: The recrystallisation temperature is the temperature at which new, strain-free grains nucleate and grow in a cold-worked metal.
Correct answer: Recrystallisation temperature- A. 25 : 1
- B. 22 : 1
- C. 14 : 1
- D. 4 : 1
Explanation: Petrol engines operate near the stoichiometric air-fuel ratio of about 14.7:1 by mass, commonly rounded to 14:1.
Correct answer: 14 : 1- A. Drain out water and sludge from the boiler during repair
- B. All A, B. & C
- C. Guard the boiler in case of abnormal rise in steam pressure
- D. Put off fire in the furnace when water level in the boiler falls to unsafe limit
Explanation: A fusible plug melts when the water level falls enough to expose it to excessive furnace heat, releasing water or steam and extinguishing…
Correct answer: Put off fire in the furnace when water level in the boiler falls to unsafe limit- A. Introduces a compressive layer on the surface
- B. Enhances the yield point of the material
- C. Suppresses any stress concentration produced in the parts
- D. Produces a better surface finish
Explanation: Carburisation hardens the surface and creates a compressive residual-stress layer, which improves fatigue resistance and raises the…
Correct answer: Introduces a compressive layer on the surface- A. Authored by Kirk Othmer
- B. Edited by Kirk Othmer
- C. Edited by Perry and Chilton
- D. Authored by Perry and Chilton
Explanation: The Encyclopaedia of Chemical Technology is associated with Kirk and Othmer as editors, not as sole authors.
Correct answer: Edited by Kirk Othmer- A. -0.8
- B. 0.8
- C. +0.08
- D. -0.24
Explanation: For uniaxial elastic loading, lateral strain equals minus Poisson's ratio times longitudinal strain: εt = −0.3(0.8) = −0.24.
Correct answer: -0.24- A. Resilience
- B. Toughness
- C. Ductility
- D. Impact strength
Explanation: Resilience is the energy a material can absorb elastically and release without permanent deformation.
Correct answer: Resilience- A. Al2O3
- B. SiO2
- C. CaSiO2
- D. MgO
Explanation: Corundum is primarily crystalline aluminium oxide, Al2O3, commonly containing more than 95% of this compound.
Correct answer: Al2O3- A. Copper
- B. Steel
- C. Zinc
- D. Aluminium
Explanation: The Linz-Donawitz converter is a basic oxygen furnace in which oxygen is blown through molten pig iron to reduce carbon and other…
Correct answer: Steel2415. Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
- A. Sinter
- B. Iron ore
- C. Coke
- D. Limestone
Explanation: Coke is generally the principal sulphur-bearing material in a blast-furnace charge because it contains sulphur from the coal used in its…
Correct answer: Coke- A. Zinc, copper & nickel
- B. Nickel, cobalt & vanadium
- C. Zinc, aluminium & nickel
- D. Cobalt, chromium & tungsten
Explanation: Stellite is a cobalt-base alloy whose characteristic alloying additions include chromium and tungsten, giving it high hardness, wear…
Correct answer: Cobalt, chromium & tungsten- A. Uranium - 233 : Fertile material
- B. Binding energy : Mass defect
- C. Scattering: Absorption cross-section
- D. Number of nucleons : Mass number
Explanation: Uranium-233 is a fissile material, not a fertile material; thorium-232 is the familiar fertile material that breeds uranium-233.
Correct answer: Uranium - 233 : Fertile material2418. Specific gravity of hot metal (pig iron) is ______________ times that of the blast furnace slag ?
- A. 2
- B. 3
- C. 0.8
- D. 6
Explanation: Pig iron has a specific gravity of roughly 7, whereas blast-furnace slag is about 2.3 to 2.5.
Correct answer: 3- A. None of these
- B. H2SO3 is formed
- C. Oleum is formed
- D. Precipitation of sulphur takes place
Explanation: Sulphur dioxide and hydrogen sulphide undergo a redox reaction: 2H2S + SO2 → 3S + 2H2O.
Correct answer: Precipitation of sulphur takes place- A. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
- B. Pitting corrosion is usually very localised
- C. Hydrogen embrittlement is facilitated by tensile stress
- D. Stress corrosion cracking is facilitated by tensile stress
Explanation: Martensitic stainless steels generally have lower corrosion resistance and are more prone to pitting than austenitic stainless steels, so…
Correct answer: Martensitic steels are less susceptible to pitting corrosion than austenitic steels