⚗️ 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

Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be aboutAnswer: 17 : 1 In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend uponAnswer: None of these Which of the following alloying elements is present in maximum percentage in high speed steel.Answer: Molybdenum __________ is a non volatile film forming constituent of a paint.Answer: Drying oil Two iron pipes of the same nominal diameter but different schedule numbers will have the sameAnswer: Inside diameter According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.Answer: 0.5 Transformer cores are normally made fromAnswer: Grain oriented Fe-Si alloy __________ test is the appropriate test to determine whether a material is ductile or brittle.Answer: Impact Main constituent of bone ash isAnswer: Calcium phosphate. Tempering of a material does not improve itsAnswer: Machinability Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m2.°C.Answer: 7500 High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.Answer: 45 to 50 Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used ?Answer: Spark plug fouling. __________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.Answer: Supermax Heat release during phase change is observed in case of a/anAnswer: Condenser Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.Answer: 20 In chemical process equipments, the conical bottom heads used, usually has an apex angle ofAnswer: 60° Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than __________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop.Answer: 75 Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size isAnswer: Less Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of theAnswer: Ultimate stress to working stress. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.Answer: 20-40 __________ tray arrangement is recommended for distillation column having diameter upto 4 ft.Answer: Cross flow What is the value of 'q' for saturated liquid feed to a distillation column ?Answer: 1 In perforated plate towers, theAnswer: All (a), (b) and (c). The main purpose of providing stepping on the trays is toAnswer: Facilitate handling of large flow rate of liquid. The operating pressure drop range in a bag filter is about __________ mm water gauge.Answer: 50-150 The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.Answer: Ellipsoidal The hardenability of steel decreases withAnswer: Decrease in grain size. Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe isAnswer: Less Pick out the wrong statement pertaining to the design of a basket type evaporator.Answer: It is used for high viscosity liquor having large rate of scaling.