⚗️ 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

Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubesisabout__________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate.Answer: 8 Which one is neutral in character ?Answer: N₂O Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid ?Answer: 2 p While the bin cards are used in the effective stores management, the queing theory is associated with the __________ time.Answer: Waiting Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.Answer: 40 Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.Answer: Atoms The product of a commercial direct reduction process isAnswer: Sponge iron In the diving apparatus, helium is used along with oxygen, because it isAnswer: Not soluble in blood at high pressure. Materials having resistivity ranging from 1 to 100 ohm. cm is termed asAnswer: Semi-conductor During sensible cooling of air, its wet bulb temperatureAnswer: Increases but dew point remains constant. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?Answer: Both 'a' & 'b'. If Reynolds number is greater than 1, then theAnswer: Inertia force is larger than the viscous force. The type of pump used for lifting large quantity of sewage is a __________ pump.Answer: Centrifugal To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions(constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor ofAnswer: (1.2)5/3 Which of the following metals is not subjected to electrolytic refinning/purification?Answer: Tin The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut isAnswer: More In a heat exchanger, shell side fluid velocity can be changed by changing the tubeAnswer: Both (a) & (b) The underground well of a biogas plant is called theAnswer: Digestor Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure ?Answer: At the inner surface. Use of water as a manometric liquid suffers from the disadvantage of itsAnswer: High vapour pressure. The following thermocouple may be used for measuring temperature upto 1873°K.Answer: Platinum-platinum rhodium It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less thanAnswer: 0.80 Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.Answer: Rankine A rivetted joint does not fail by __________ of rivets.Answer: None of these Closeness of packing is maximum in case of __________ crystal lattice.Answer: Face centred Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchangerAnswer: Permits the use of more tubes in a given shell diameter. A material is capable of resisting softening at high temperature, because of its property termed asAnswer: Hot hardness Cascade control isAnswer: All 'a', 'b' & 'c'. Bracket supports are the most suitable for supporting __________ vessels.Answer: Thick walled vertical Softening of hardned steel is done by itsAnswer: Normalising