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. E = 2G (1 + 2v)
- B. E = G (1 + v)
- C. E = G (1 + v)/2
- D. E = 2G (1 + v)
Explanation: For an isotropic elastic material, Young’s modulus, shear modulus and Poisson’s ratio satisfy E = 2G(1 + ν).
Correct answer: E = 2G (1 + v)- A. High carbon steel
- B. High speed steel
- C. Forged steel
- D. Mild steel
Explanation: Cold chisels and hammer heads require high hardness and resistance to impact wear, properties obtained from high-carbon tool steel after…
Correct answer: High carbon steel- A. Large number of slip systems
- B. Low stacking fault energy
- C. Coarse grain size
- D. High work hardening rate
Explanation: Cross-slip requires a dislocation to move from one slip plane to another, which is hindered when the stacking-fault energy is low.
Correct answer: Low stacking fault energy- A. Compression ignition engine
- B. Diesel engine
- C. Engine having carburettor
- D. Both B. & C.
Explanation: A spark plug ignites the air-fuel mixture in a spark-ignition engine, which commonly has a carburettor.
Correct answer: Engine having carburettor- A. Neither A nor B
- B. Manganese
- C. Both A nor B
- D. Carbon
Explanation: Carbon raises the ductile-to-brittle transition temperature of steel by promoting harder, more brittle microstructures.
Correct answer: Carbon- A. Copper
- B. Lead
- C. Wrought iron
- D. Aluminium
Explanation: Malleability is the ability to undergo plastic deformation under compression, and lead is exceptionally malleable among these choices.
Correct answer: Lead- A. Tensile strength
- B. Compressive strength
- C. Thermal co-efficient of expansion
- D. Young's modulus
Explanation: Steel and concrete have nearly equal coefficients of thermal expansion, so temperature changes produce similar dimensional changes in…
Correct answer: Thermal co-efficient of expansion- A. Haemoglobin
- B. None of these
- C. Hypo solution
- D. Chlorophyll
Explanation: Magnesium is the central metal ion in the chlorophyll molecule, where it plays a key role in absorbing light for photosynthesis.
Correct answer: Chlorophyll- A. Hydrogen
- B. Deuterium
- C. Neon
- D. Helium
Explanation: Ordinary hydrogen-1, called protium, has one proton and no neutron; deuterium has one neutron and helium and neon contain neutrons in…
Correct answer: Hydrogen- A. High speed steel
- B. Carbide
- C. Cast alloy
- D. Plain carbon steel
Explanation: Carbide tools retain hardness at much higher temperatures than high-speed steel, allowing greater cutting speeds.
Correct answer: Carbide- A. Silver
- B. Aluminium
- C. Carbon
- D. Stainless steel
Explanation: Carbon has much lower electrical conductivity than metals such as silver and aluminium; stainless steel is also relatively resistive but…
Correct answer: Carbon- A. All amorphous
- B. Ceramic
- C. All crystalline
- D. Non-crystalline organic polymeric
Explanation: Viscoelasticity is especially characteristic of non-crystalline organic polymers, which show both elastic recovery and time-dependent…
Correct answer: Non-crystalline organic polymeric- A. Lime & Magnesia
- B. Alkali oxide
- C. Alumina
- D. None of these
Explanation: Lime and magnesia are useful basic fluxing constituents in iron ore and can improve its metallurgical value.
Correct answer: Lime & Magnesia- A. Glass
- B. Diamond
- C. Brine
- D. Kerosene
Explanation: Diamond has a refractive index of about 2.42, higher than ordinary glass, brine, and kerosene.
Correct answer: Diamond- A. Both silicon & carbon should be high
- B. Silicon should be low but carbon should be high
- C. Carbon and silicon should be low
- D. Silicon should be high but carbon should be low
Explanation: Rimming steel requires low carbon and silicon so that carbon monoxide evolution produces the characteristic rim during solidification.
Correct answer: Carbon and silicon should be low- A. Pure oxygen has been used for combustion
- B. Nitrogen percentage in the fuel is very high
- C. Hydrogen is not present in the fuel
- D. Excess air has been used for combustion
Explanation: The oxygen remaining after combustion, together with nitrogen from air, indicates that more air than the theoretical requirement was…
Correct answer: Excess air has been used for combustion- A. (Molecular weight)2
- B. (Equivalent weight)2
- C. Molecular weight
- D. Equivalent weight
Explanation: Faraday's law states that the mass deposited or liberated by a fixed quantity of electricity is proportional to the substance's equivalent…
Correct answer: Equivalent weight- A. Hot metal
- B. Flue gases
- C. Slag
- D. Refractory lining
Explanation: Phosphorus is readily reduced and dissolves in the molten iron, so most of it reports to the hot metal in the blast furnace.
Correct answer: Hot metal- A. 8.82
- B. 9.81
- C. 10.88
- D. 0.95
Explanation: The balance reading gives weight in kilogram-force: 1.8 kgf = 2g/9.81 kgf. Hence g = 1.8(9.81)/2 = 8.83 m/s², approximately 8.82 m/s².
Correct answer: 8.82- A. Refine coarse grain structure obtained during hot working
- B. Improve mechanical properties
- C. Improve yield strength
- D. Improve ductility
Explanation: Normalising refines the grain structure and generally raises strength, including yield strength, while improving overall mechanical…
Correct answer: Improve ductility