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 165 of 350
- A. Creep
- B. Tension
- C. Compression
- D. Endurance
Explanation: Yield strength is obtained from a tensile test by identifying the stress at which permanent plastic deformation begins.
Correct answer: Tension- A. Stainless steel tubes used in furnitures
- B. Aluminium curtain rods
- C. Cast iron pipe for domestic water supply
- D. Any of these
Explanation: Cast iron has poor ductility and is difficult to force through an extrusion die, so cast iron domestic water pipes are generally made by…
Correct answer: Cast iron pipe for domestic water supply- A. Soluble in solid state
- B. Insoluble in liquid state
- C. Soluble in liquid state
- D. Insoluble in both solid & liquid state
Explanation: In a eutectic system, the components are completely soluble in the liquid phase and solidify at a specific eutectic composition and…
Correct answer: Soluble in liquid state- A. Buffer
- B. Ideal
- C. Neutral
- D. Zero pH
Explanation: A buffer contains a weak acid and its conjugate base, or a weak base and its conjugate acid, which consume added H+ or OH− and resist pH…
Correct answer: Buffer- A. 3
- B. 7
- C. 11
- D. 15
Explanation: Escape velocity is given by √(2gR), so the body's mass cancels from the equation.
Correct answer: 11- A. Carbon dioxide
- B. Oxygen
- C. Carbon monoxide
- D. Air
Explanation: Carbon monoxide is the principal reducing gas in a blast furnace and removes oxygen from iron oxides to form iron.
Correct answer: Carbon monoxide3287. There are one octahedral void and ______________ tetrahedral void in the closest packing of atoms ?
- A. One
- B. None of these
- C. Three
- D. Two
Explanation: In closest packing, each atom is associated with one octahedral void and two tetrahedral voids.
Correct answer: Two- A. Magnesium
- B. Phosphorous
- C. Manganese
- D. Chromium
Explanation: Magnesium changes the graphite from flakes into rounded nodules, producing nodular or ductile cast iron.
Correct answer: Magnesium- A. Spraying water
- B. Blanketting the area with nitrogen atmosphere
- C. Fire fighting foam
- D. None of these
Explanation: Nitrogen is inert and reduces the oxygen concentration around a fuel-gas fire, suppressing combustion without adding another combustible…
Correct answer: Blanketting the area with nitrogen atmosphere- A. Hard
- B. Elastic
- C. Ductile
- D. Brittle
Explanation: A fibrous fracture results from substantial plastic deformation before separation, which is characteristic of ductile materials.
Correct answer: Ductile- A. Ductile
- B. Tough
- C. Rigid
- D. Plastic
Explanation: Ductile materials undergo appreciable plastic deformation before fracture, whereas brittle materials fail at small strains.
Correct answer: Ductile- A. Equal
- B. More
- C. Less
- D. Double
Explanation: The elastic energy of an edge dislocation contains an additional factor of 1/(1−ν) compared with a screw dislocation.
Correct answer: More- A. Promotes graphite module formation
- B. Improves its ductility
- C. Increases the fluidity of molten metal
- D. Does not promote graphite flakes formation
Explanation: Silicon is a graphitising element in cast iron and also improves the fluidity of the molten metal.
Correct answer: Increases the fluidity of molten metal- A. Wrought iron
- B. Stainless steel
- C. Mild steel
- D. High speed steel
Explanation: High-speed steel retains hardness at the high temperatures produced during sawing, so it remains effective as a power-saw blade.
Correct answer: High speed steel- A. Load to produce unit deflection
- B. Capacity to store energy
- C. Ratio of the wire & coil diameters
- D. Ability to absorb shock
Explanation: Spring stiffness is the force required to produce unit deflection, expressed as load divided by deflection.
Correct answer: Load to produce unit deflection- A. Grey cast iron
- B. Malleable iron
- C. Chilled cast iron
- D. White cast iron
Explanation: Malleable iron is comparatively ductile and tough, allowing it to absorb shock and vibration without cracking readily.
Correct answer: Malleable iron3297. The most serious manufacturing defect from fracture toughness point of view is____________________?
- A. Surface roughness
- B. Pores
- C. Spherical inclusion
- D. Crack
Explanation: A crack is the most dangerous manufacturing defect because its sharp tip produces a strong stress concentration and can initiate rapid…
Correct answer: Crack- A. Tungsten
- B. Zirconium
- C. Molybdenum
- D. Tantalum
Explanation: Tungsten has the highest melting point among the listed metals, approximately 3422°C.
Correct answer: Tungsten- A. Glass
- B. Lead
- C. Zinc
- D. Tin
Explanation: Glass is amorphous because its atoms lack the long-range periodic arrangement found in crystalline metals such as tin, lead and zinc.
Correct answer: Glass- A. 6 : 1
- B. 12 : 1
- C. 18 : 1
- D. 24 : 1
Explanation: A spark-ignition engine develops maximum power with a fuel-rich mixture, commonly at an air-fuel ratio near 12:1.
Correct answer: 12 : 1