⚗️ 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

A controller action in which there is a con-tinous relation between the values of controlled variable and the rate of change of conrolled output signal is called the __________ action.Answer: Integral An ideal fluid isAnswer: Non-viscous & incompressible. The amount of combustible escaping uncon-sumed from the furnace, depends upon theAnswer: All (a), (b) and (c). When dry bulb temperature & wet bulb temperature of moist air is the same, it means that theAnswer: Air is fully saturated. __________ is an indirectly heated furnace.Answer: Muffle furnace High __________ of cast iron makes it suitable for use in machine beds.Answer: Compressive strength The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.Answer: 85 In a muffle furnace, the muffleAnswer: All (a), (b) and (c). Which is not a hearth furnace ?Answer: Cupola Which of the following alloying elements reduces the formation of iron sulphide in steel ?Answer: Nickel An example of shaft furnace is theAnswer: Blast furnace In age-hardenable alloys, maximum ductility is obtainedAnswer: After optimum ageing. Prandtl mixing length in turbulent flow signifies theAnswer: Average distance perpendicular to the mean flow covered by the mixing particles. Which is a regenerative furnace ?Answer: Both (a) and (b) Which of the following accentuates clinker-ing troubles on furnace grate burning coal?Answer: All (a), (b) and (c). Magnesium addition to cast iron increases itsAnswer: Ductility and strength in tension. The dimensions of Planck's constant is the same as that of theAnswer: None of these The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.Answer: High frequency induction 1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).Answer: 10000 Ingress of cold air in the furnaces through cracks, charging doors, openings etc.Answer: All (a), (b) and (c) The ratio of coil diameter to wire diameter of a spring is called the springAnswer: Index Use of pulverised coal in boilers providesAnswer: Better combustion The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.Answer: Dew point In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time ?Answer: Regenerator Dialysis is the process of separating substances in theAnswer: Colloidal state from those present in the true solutions. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.Answer: Arc Turndown ratio of a burner gives an idea of the __________ in the furnace.Answer: Range of fuel firing rates In low or standard frequency induction furnace, heat is produced by theAnswer: Induction and resistance. Which furnace employs natural draft ?Answer: Boiler Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in aAnswer: Carbon resistance furnace.