⚗️ 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

Which of the following is a commonly used manometric liquid for low pressure range?Answer: Carbon tetrachloride The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.Answer: Creep Graphite or carbon refractoriesAnswer: Should be used in neutral or reducing atmosphere. Metal shots used in shot blasting are made ofAnswer: Steel At the point of boundary layer separation in fluid flow, theAnswer: Shear stress is maximum. Brinell Hardness Number (BHN) for talc is approximately in the range ofAnswer: 20-30 A spring material should have lowAnswer: None of these Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will beAnswer: 5 Which of the following is an acidic constituent of B.F. slag ?Answer: SiO₂ Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens isAnswer: 5CaO . 3 Al₂O₃ 'Spinel', a refractory mineral is chemically represented asAnswer: MgAl₂O₄ Material of construction of the electrode used in the electric resistance welding isAnswer: Copper In practice, the compression ratio of compression-ignition (CI) engine ranges fromAnswer: 15 to 25 Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2 ) is __________ °C.Answer: >2000 __________ property of steel increases by addition of large amount of silicon in it.Answer: Magnetic __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.Answer: Non-wetting characteristics __________ stress can not be sustained by a fluid in equilibrium.Answer: Shear __________ test can be termed as the semi-distructive test.Answer: Hardness Bauxite calcining rotary kilns are lined with __________ bricks.Answer: 85% alumina Uniform ramming of sand in green sand moulding process leads toAnswer: Greater dimensional stability of the casting. The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.Answer: Carbon Use of higher percentage of lime for bonding silica bricks, reduces theirAnswer: Both (a) & (b) The noble metalsAnswer: Are the lowermost in the electro-chemical series of metals. Which of the following is an example of cathodic protection of metals against corrosion ?Answer: Galvanised iron Grog addition in fireclay during brick manufacture is done toAnswer: All (a), (b) and (c). Thermal efficiency of an internal combustion engine is around __________ percent.Answer: 35 Pick out the correct combination about the role of various additives used in polymers.Answer: Fillers: Does not affect the property of polymer but increases its weight. To resist spalling tendency, a refractory should haveAnswer: All (a), (b) and (c). The lightest non-inflammable gas isAnswer: He Cold crushing strength of fireclay bricks is about __________ kgf/cm2.Answer: 200-400