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 310 of 350
- A. Steel
- B. Cast iron
- C. Ferroalloy
- D. None of these
Explanation: Cast iron commonly contains excess carbon in the form of graphite flakes or nodules, whereas in steel most carbon remains chemically…
Correct answer: Cast iron- A. Inconel
- B. German silver
- C. Hastelloy
- D. Solder
Explanation: Hastelloy is a nickel-based corrosion-resistant alloy family whose important alloying additions commonly include molybdenum, with some…
Correct answer: Hastelloy- A. None of these
- B. Copper & aluminium
- C. Lead & tin
- D. Iron & copper
Explanation: Constantan is a copper-nickel alloy, typically containing about 55% copper and 45% nickel, and is used with copper in thermocouples.
Correct answer: None of these- A. Cast iron
- B. Karbate
- C. Mild steel
- D. Stainless steel
Explanation: Karbate is an impervious graphite material with excellent resistance to hydrochloric acid, making it suitable for HCl absorbers.
Correct answer: Karbate- A. Mild steel
- B. 18/8 stainless steel
- C. Molybdenum stainless steel
- D. High silicon iron (14% Si)
Explanation: Molybdenum stainless steel retains high strength and creep resistance at about 500°C while also resisting corrosion under severe pressure.
Correct answer: Molybdenum stainless steel- A. Brittleness
- B. Toughness
- C. Resilience
- D. Hardness
Explanation: Hardness is the ability of a material to resist scratching, abrasion, or indentation.
Correct answer: Hardness- A. Steel
- B. Wood
- C. Concrete
- D. Porcelain
Explanation: Steel tanks are commonly used for Kraft-process black and white liquors because they provide the required mechanical strength and can be…
Correct answer: Steel- A. Ferromagnetic
- B. Paramagnetic
- C. Diamagnetic
- D. None of these
Explanation: Above the Curie temperature, thermal agitation destroys the long-range alignment responsible for ferromagnetism.
Correct answer: Paramagnetic- A. Stainless steel
- B. Aluminium
- C. Cast iron
- D. Nickel
Explanation: Cast iron is widely used for concentrated sulphuric acid because the acid promotes a protective surface film under these conditions.
Correct answer: Cast iron- A. Silica
- B. Tar-dolomite
- C. Low thermal conductivity
- D. Fire clay
Explanation: Silica bricks line coke ovens because they withstand the high operating temperature and have good refractoriness with low chemical…
Correct answer: Silica- A. Normalising
- B. Tempering
- C. Annealing
- D. Carburising
Explanation: Tempering reheats hardened steel below its critical temperature, reducing brittleness and hardness while retaining useful strength.
Correct answer: Tempering- A. High silicon iron (14% Si)
- B. Mild steel
- C. Molybdenum stainless steel
- D. Copper
Explanation: The calorimeter bomb must withstand high oxygen pressure and resist attack by hot combustion products, so it is made from…
Correct answer: Molybdenum stainless steel- A. Normalising
- B. Carburising
- C. Annealing
- D. Tempering
Explanation: Tempering softens hardened steel by controlled reheating, relieving internal stresses and reducing brittleness.
Correct answer: Tempering- A. Universal testing machine
- B. Hydraulic press
- C. Mechanical press
- D. None of these
Explanation: A universal testing machine applies controlled tensile loading and records the load-extension behavior, allowing tensile strength to be…
Correct answer: Universal testing machine- A. Steel
- B. Karbate
- C. Stainless steel
- D. None of these
Explanation: Water and acid-free benzol can be stored in ordinary steel because the absence of acid greatly reduces corrosion risk.
Correct answer: Steel- A. Molybdenum stainless steel
- B. Mild steel
- C. Tin
- D. Aluminium
Explanation: The gas holder of a gobar-gas plant is commonly fabricated from mild steel because it is economical, weldable, and sufficiently strong for…
Correct answer: Mild steel- A. Wood
- B. Stainless steel
- C. High silicon iron (14% Si)
- D. Reinforced concrete lined with lead
Explanation: Sulfuric-acid leaching requires protection against acid attack, so the reinforced-concrete tank is lined with lead.
Correct answer: Reinforced concrete lined with lead- A. Chromium
- B. Sulphur
- C. Vanadium
- D. Tungsten
Explanation: Chromium increases hardenability, allowing hardness to penetrate farther from the quenched surface into the steel.
Correct answer: Chromium- A. Machinability
- B. Hardness
- C. Strength
- D. Ductility
Explanation: Nickel strengthens the copper lattice and increases resistance to deformation, so copper-nickel alloys are harder than pure copper.
Correct answer: Hardness- A. High speed
- B. Stainless
- C. None of these
- D. Heat resisting
Explanation: Clock pendulums are normally made from Invar, a nickel-iron alloy with an exceptionally small coefficient of thermal expansion.
Correct answer: None of these