⚗️ 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

Thermit welding uses the following energy source.Answer: Chemical energy. Crushing strength of a refractoryAnswer: Decreases with rise in service temperature. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon theAnswer: Both 'b' & 'c'. Ramming masses are used forAnswer: Both (a) & (b). Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler. A. Induced draft fan B. Economiser C. Air preheater D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories ?Answer: D, B, C, A Case hardening of a material isAnswer: Carried out to get extreme hardness in its core. Bottom of basic open hearth furnace are constructed ofAnswer: Dead burnt magnesite ramming mass. Bottom of basic open hearth furnace are constructed ofAnswer: Dead burnt magnesite ramming mass. The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.Answer: 0.002 Which form of silica has the highest specific gravity ?Answer: Quartz Steel balls are manufactured byAnswer: Cold heading Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made ofAnswer: Silicon carbide __________ temperature remains constant during adiabatic saturation process of unsaturated air.Answer: Wet bulb __________ is the measure of the strength of refractory under the combined effect of temperature & load.Answer: RUL The best lubricants for a machine working at high temperature & load isAnswer: Solid lubricant One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W . m-1 . k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) isAnswer: 10000 Runga-Kutta method is used to solve a/anAnswer: Simultaneous non-linear equation. Recrystallisation temperature of steel is __________ °C.Answer: 800 Pressure required to increase the density of water by about 1% is __________ atmosphere.Answer: 200 Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.Answer: Annealing The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as theAnswer: Endurance limit Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.Answer: Chrome or magnesite Addition of grog in fireclay brick during its manufacture is advantageous, because it results inAnswer: All (a), (b) and (c). Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.Answer: Bakelite impregnated or fused periclase Fireclay refractoriesAnswer: All (a), (b) and (c) The best guide to judge the general quality of water is the measurement of itsAnswer: Electrical conductivity. Wrought iron is notAnswer: Having uniform strength in all directions. Which of the following is the largest quantum of pressure?Answer: 1 atmosphere Which of the following is not a charge material for cupola ?Answer: Iron ore Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore ?Answer: High thermal conductivity.