⚗️ Chemical Engineering Solved MCQs with Answers

Practice 1920 approved ⚗️ Chemical Engineering questions with verified answers from the 🛠️ Engineering Essentials subject for Pakistan exams.

1920 solved MCQs

In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case willAnswer: Increase gradually. Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cₚ/Cᵥ) ρ = specific weight of the gas)Answer: 1/√p A material lacking in toughness is usually termed asAnswer: Brittle The basic constituent of vegetable oils isAnswer: Fatty acids Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.Answer: Decreases Which of the following terminology is used for the temperature at which new grains are formed in a metal ?Answer: Recrystallisation temperature. When a tuning fork vibrates, the waves produced in the fork areAnswer: Longitudinal Fatigue limit of a material should not be increased byAnswer: Surface decarburisation For a fixed cross-sectional area, the most economical channel section has maximumAnswer: Fluid discharge rate. Pellets are not as popular a burden as sinter in the iron blast furnace, because of theirAnswer: Swelling tendency. A form of stress corrosion failure termed as 'season cracking' is generally observed inAnswer: Borosilicate glasses. A material subjected __________ must have high resilience.Answer: Shockloading Triple point of water isAnswer: 0°F Solute atoms which cause yield point phenomenon in mild steel are/isAnswer: Carbon __________ pipe is the most suitable for carrying sanitary drainage.Answer: Cast iron Liquor poisoning generally occurs due to the presence of __________ in it.Answer: Methyl alcohol Pick out the wrong statement.Answer: Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation. More than 95% of __________ is present in corrundum.Answer: A1₂O₃ Blow off cock is provided in steam boiler toAnswer: Drain out water and sludge during its repair. Work hardening of a materialAnswer: Decreases its tensile strength. Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammoniumAnswer: Nitrate Thermit welding is categorised as the __________ welding.Answer: Fusion A gas having a negative Joule-Thompson co-efficient, when throttled, willAnswer: Become hotter. Annealing of metal does notAnswer: Precede its wire drawing. Which of the following is a common constituent of both paint and oil varnish ?Answer: Drying oil Lithium is a useful alloying addition to aluminium, because itAnswer: Improves the corrosion resistance of aluminium. Pick out the wrong statement about coating/electroplating of metals.Answer: Calorising is the process of coating steel with chromium. Addition of zircon to silica refractory brick improves itsAnswer: Resistance to slag attack Which is a neutral refractory ?Answer: Graphite In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).Answer: Mechanical