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. V/A
- B. V/A2
- C. V2/A
- D. V2/A2
Explanation: Chvorinov's rule gives solidification time as t = C(V/A)^n, with n commonly taken as 2.
Correct answer: V2/A2- A. Both B. & C.
- B. A1 is highly acidic
- C. A2 is very slightly acidic
- D. A1 is more alkaline than solution A2
Explanation: A pH of 2 indicates a strongly acidic solution, while pH 6 is slightly acidic because it is just below neutral pH 7.
Correct answer: Both B. & C.- A. Decreasing the surface area of the electrodes
- B. Increasing the concentration of copper sulphate solution
- C. Increasing the surface area of the electrodes
- D. Increasing the concentration of zinc sulphate solution
Explanation: The cell potential increases when the Cu²⁺ concentration increases, as given by the Nernst equation, while increasing Zn²⁺ concentration…
Correct answer: Increasing the concentration of copper sulphate solution2444. An abrupt and sudden fall in the reading of barometer is an indication of the____________________?
- A. Clear weather
- B. Rain
- C. Storm
- D. Cold wave
Explanation: A rapid fall in barometric pressure means air pressure is dropping as a low-pressure system approaches.
Correct answer: Storm- A. Hexagonal close, packed (hcp)
- B. Face centred cubic (fcc)
- C. Body centred cubic (bcc)
- D. Simple cubic
Explanation: Simple cubic has atoms only at the eight corners, giving a packing efficiency of about 52%, lower than bcc, fcc, and hcp.
Correct answer: Simple cubic- A. Number
- B. Weight
- C. Radius
- D. None of these
Explanation: Atomic number equals the number of protons in an atom's nucleus, so it is always a whole number.
Correct answer: Number- A. Electrolytic reduction
- B. Magnesium reduction
- C. Calcium reduction
- D. Thermal dissociation
Explanation: Titanium is commercially produced by the Kroll process, in which TiCl4 is reduced with molten magnesium to form titanium sponge.
Correct answer: Magnesium reduction- A. Duralumin
- B. Hastelloy
- C. Invar
- D. Monel metal
Explanation: Invar is a nickel-iron alloy with an exceptionally low coefficient of thermal expansion and adequate strength, so it retains dimensional…
Correct answer: Invar- A. All A, B & C
- B. Brinell hardness
- C. Tensile strength
- D. Percentage elongation
Explanation: Reducing zinc and increasing copper changes brass toward a more ductile, copper-rich composition, so percentage elongation increases.
Correct answer: Percentage elongation- A. SiO2
- B. Al2O3
- C. MnO2
- D. P
Explanation: Limestone decomposes to CaO in the blast furnace, and the basic CaO combines with acidic silica to form a fusible slag.
Correct answer: SiO2- A. Induce stresses in it
- B. Refine its grain structure
- C. Reduce segregation
- D. Improve its mechanical properties
Explanation: Normalising heats steel above its critical range and air-cools it, refining grains, reducing segregation, and improving mechanical…
Correct answer: Induce stresses in it- A. Veneering
- B. Galvanising
- C. Calorising
- D. Electroplating
Explanation: Calorising is a thermochemical treatment in which aluminium diffuses into the steel surface and forms a protective alumina film during…
Correct answer: Calorising- A. 0.09
- B. 0.3
- C. 0.57
- D. 0.94
Explanation: Dry air contains approximately 78% nitrogen, 21% oxygen, and 0.94% argon by volume. Therefore, the closest listed value is 0.94%.
Correct answer: 0.94- A. All (A), B. & C.
- B. Liquefied & stored under cryogenic conditions
- C. Produced by electrolysis of water
- D. Used in I.C. engines as fuel
Explanation: Hydrogen can serve as fuel in internal-combustion engines, be liquefied and stored at cryogenic temperature, and be produced by…
Correct answer: All (A), B. & C.- A. Whose oxide/ore is not reduced by carbon
- B. All A, B. & C.
- C. Which stands higher in the electrochemical series of the metal
- D. Which fall in the category of alkali & alkaline earth metals
Explanation: Electrometallurgy is preferred for highly reactive metals whose compounds are difficult to reduce chemically, especially metals above…
Correct answer: All A, B. & C.- A. Sorbite
- B. Martensite
- C. Bainite
- D. Troostite
Explanation: Austempering cools austenite rapidly to the bainite transformation range and holds it there until transformation occurs.
Correct answer: Bainite- A. All A , B. & C.
- B. Oxidation number
- C. Number of ions
- D. Number of electrons
Explanation: Oxidation is defined by loss of electrons, while reduction is gain of electrons.
Correct answer: Number of electrons- A. Arc
- B. Gas
- C. Thermit
- D. Resistance
Explanation: Arc welding commonly uses a consumable electrode that melts and supplies filler metal to the joint.
Correct answer: Arc- A. Sulphur
- B. Lead
- C. Silicon
- D. Phosphorous
Explanation: Sulphur, lead and phosphorus are commonly added to steel to improve machinability by promoting easier chip breaking or reducing tool…
Correct answer: Silicon2460. In electrical resistance welding, distortion results from the use of improper________________?
- A. Filler material
- B. Electrodes
- C. Current
- D. Clamping methods
Explanation: In resistance welding, incorrect clamping can restrain or unevenly distribute thermal contraction, producing residual stresses and…
Correct answer: Clamping methods