⚗️ 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 categorised as the plastic welding ?Answer: Forge welding In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.Answer: All modes of When water is sprayed on air, passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, then the air isAnswer: Cooled and humidified. The hardness of the lathe bed material is measured by theAnswer: shore sceleroscope. RADAR isAnswer: All (a), (b) & (c) In the floatation process, pine oil is used as theAnswer: Frother With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.Answer: Impact strength Ageing of steel refers to theAnswer: Return of sharp yield point in temper rolled low carbon sheet after a period of time. When metals are heated to high temperature, their __________ increases in general.Answer: Atomic vibration A friction lighter is normally used for lighting gas welding torch, because of the reason thatAnswer: Safety of welder is ensured. __________ is not used as a material of construction in thermocouples.Answer: Duralumin Coarse grained steels haveAnswer: No tendency to distort Steel balls are manufactured by cold heading. After cold forming, they are subjected toAnswer: stress-relieving Free oxygen is removed from boiler feed water, because itAnswer: Is corrosive. Out of the following, the materials having maximum magnetic permeability isAnswer: Silicon steel (Si = 4%) A material being tested for endurance strength is subjected to the __________ load.Answer: Completely reversed Old cycle handles are coated with nickel usingAnswer: Spray coating. CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that theAnswer: Both 'b' & 'c' Pick out the wrong conversion of absolute & kinematic viscosities.Answer: 1 stoke = 1 m²/sec. Unit molar solution of __________ is the best conductor of electricity.Answer: Sulphuric acid A coal with high __________ content will ignite most easily.Answer: Volatile matter The weight of a body at the centre of the earth isAnswer: Zero. For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.Answer: Heat rejection is lower. The single most imortant requirement for a turbine blade material isAnswer: Creep resistaned In cold working of metal as compared to its hot workingAnswer: Yield stress, hardness and fatigue strength is not at all affected. _________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.Answer: Shot peening Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.Answer: Scratch Fresh water carrying pipelines in chemical industries are coloured with __________ color.Answer: Sea green Which of the following is a weak acid ?Answer: HF Pig iron is a product ofAnswer: Blast furnace