All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 152 of 350
- A. Compressive
- B. Tensile
- C. Toughness
- D. Hardness
Explanation: The Herbert pendulum determines hardness by observing the damping or loss of swing caused by contact with the material surface.
Correct answer: Hardness- A. 0.015
- B. 0.71
- C. 1.2
- D. 3.5
Explanation: Natural water contains about 0.015% deuterium oxide, or heavy water, mainly because a small fraction of hydrogen is naturally present as…
Correct answer: 0.015- A. High ambient temperature
- B. High atmospheric temperature
- C. Ultraviolet radiation
- D. Damp atmosphere
Explanation: Ultraviolet radiation supplies enough energy to break polymer bonds and initiate photo-oxidation, causing plastics to become brittle and…
Correct answer: Ultraviolet radiation3024. For grinding of softer materials, the grinding wheel should have _________________ grain size ?
- A. Finer
- B. Any type of
- C. Medium
- D. Coarser
Explanation: Soft materials tend to clog or load a grinding wheel, so larger, coarser grains provide more open space for chip removal and reduce…
Correct answer: Coarser- A. nλ = 2d Sin θ
- B. λ = d Sin 2θ
- C. λ = 2d Sin 2θ
- D. nλ = d Sin θ
Explanation: Diffraction from successive crystal planes follows Bragg's law, nλ = 2d sin θ, where d is the interplanar spacing and θ is the glancing…
Correct answer: nλ = 2d Sin θ- A. Cylinder
- B. Runner
- C. Mold
- D. None of these
Explanation: In injection moulding, the sprue is the main passage carrying molten material from the nozzle to the runner system.
Correct answer: Runner- A. d1/2
- B. d-1/2
- C. d
- D. d-1
Explanation: The Hall-Petch relation states that yield strength increases as grain size decreases: σy = σ0 + k d^-1/2.
Correct answer: d-1/2- A. Work hardening
- B. Creeping effect
- C. Bauschinger effect
- D. Stress recovery effect
Explanation: The Bauschinger effect occurs when prior plastic deformation in one direction lowers the yield stress during reverse loading.
Correct answer: Bauschinger effect- A. Ductility
- B. Semi-conductivity
- C. Yield stress
- D. Melting point
Explanation: Melting point is primarily determined by the crystal structure and bonding of a material, rather than by ordinary crystal imperfections.
Correct answer: Melting point- A. 0.25
- B. 0.45
- C. 0.70
- D. 0.95
Explanation: Alloys generally recrystallise at a higher fraction of their melting temperature than pure metals because solute atoms and other phases…
Correct answer: 0.70- A. Densities
- B. Magnetic permeabilities
- C. Electrical conductivities
- D. Hardness
Explanation: Electrostatic separators charge mineral particles and separate them according to how readily they conduct or retain electrical charge.
Correct answer: Electrical conductivities- A. Babbitt metal
- B. Gun metal
- C. Stainless steel
- D. Duralumin
Explanation: Duralumin is an aluminium-copper alloy whose strength is increased by solution treatment, quenching and ageing, making it a classic…
Correct answer: Duralumin- A. Orange yellow in alkaline medium
- B. Orange yellow in acidic medium
- C. Colourless in acidic medium
- D. Colourless in basic medium
Explanation: Methyl orange is red in acidic solution and changes through orange to yellow as the solution becomes alkaline.
Correct answer: Orange yellow in alkaline medium3034. Sand used to stop the green sand from sticking to the pattern is termed as the ______________ sand?
- A. Synthetic
- B. Parting
- C. Loam
- D. Dry
Explanation: Parting sand is dusted over the pattern to prevent the moist green sand from adhering to it during moulding.
Correct answer: Parting- A. 100% indirect reduction
- B. 100% direct reduction
- C. 50-60% indirect reduction
- D. 30-40% indirect reduction
Explanation: About 50 to 60% of wustite reduction should occur indirectly by CO, because indirect reduction saves coke and improves blast-furnace…
Correct answer: 50-60% indirect reduction- A. 4.4
- B. 5.6
- C. 8.4
- D. 2.4
Explanation: Using pH = -log[H+], pH = -log(4 × 10^-5) = 5 - log 4 = 5 - 0.6 = 4.4. The exponent gives the 5, while log 4 supplies the 0.6 correction.
Correct answer: 4.4- A. Stretchability
- B. Drawability
- C. Bendability
- D. None of these
Explanation: The Swift cup test measures drawability by determining how far a sheet can be drawn into a cup before cracking.
Correct answer: Drawability- A. High speed steel
- B. Forged steel
- C. High carbon steel
- D. Mild steel
Explanation: Cold chisels require a hard, wear-resistant cutting edge, which is obtained from high-carbon steel after suitable heat treatment.
Correct answer: High carbon steel- 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.