Chemical Engineering MCQs

Page No. 639

Pick out the wrong statement ?


a A horizontal line on the humidity chart indicates the temperature changes at constant molal humidity

✖


bWhen water is cooled from 80 to 70°C by exposure to the air with a wet bulb temperature of 60°C, then both the approach & the range would be 10°C

✖


cFor unsaturated air-water vapor mixture at atmospheric conditions, the wet bulb temperature & adiabatic cooling lines are the same

✖


dRelative saturation of unsaturated mixture of water vapor & air cannot be increased by either reducing the mixture temperature or by increasing the total pressure

✓


View Answer Relative saturation of unsaturated mixture of water vapor & air cannot be increased by either reducing the mixture temperature or by increasing the total pressure

Pick out the wrong statement?


aThe mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are the same for NSc = NPr= 1

✖


b1 Nm3 of dry air is lighter than 1Nm3 of humid air

✓


cThe Lewis number of a mixture is unity, when the thermal diffusivity is equal to the mass diffusivity

✖


dAn Azeotropic mixture of two liquids has boiling point higher than either of them, when it shows negative deviation from Raoult’s Law

✖


View Answer 1 Nm3 of dry air is lighter than 1Nm3 of humid air

Pick out the correct statement ?


aHigher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas

✖


bThe ‘Hatta number’ is important in problems involving gas absorption without chemical reaction

✖


cFor a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion

✓


dTotal reflux in case of distillation operation requires infinite number of plates for a binary system separation

✖


View Answer For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion

Pick out the wrong statement ?


aConstant pressure distillation cannot separate an Azeotropic mixture

✖


bRelative volatility of a binary mixture changes appreciably with the minor change in temperature

✓


cThe relative volatility of a binary mixture at Azeotropic composition is unity

✖


dFlash distillation is practised on wide spread scale in petroleum refinery

✖


View Answer Relative volatility of a binary mixture changes appreciably with the minor change in temperature

Pick out the correct statement ?


aPonchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non-ideal binary system by distillation

✓


bA sharp decrease in pressure drop is an indication of flooding in a distillation coloumn

✖


cSolvent used in extractive distillation should be of high volatility

✖


dFlash distillation is suitable for separating components which have very close boiling temperature

✖


View Answer Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non-ideal binary system by distillation

Pick out the wrong statement pertaining to the rotary dryer ?


aFlights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12% of the inside diameter of shell

✖


bHold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.05 to 0.15

✖


cRotary dryer is suitable for drying sticky material

✓


dRecommended peripheral speed of a rotary drier is in the range of 10 to 30 metres/minute

✖


View Answer Rotary dryer is suitable for drying sticky material

Pick out the wrong statement ?


aWith decrease in feed temperature, the number of plates required for binary distillation decreases for a given ‘L/V’ ratio

✖


bThe extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction

✖


cNatural draft cooling towers are made of ferroconcrete and its cross-section is wider at the bottom

✖


dVander wall adsorption is also called chemisorption

✓


View Answer Vander wall adsorption is also called chemisorption

Pick out the wrong statement pertaining to leaching ?


aFine solids cannot be leached in a Pachuca tank

✓


bDoor classifier can be used for leaching of coarse solids

✖


cVegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor

✖


dVery high temperature is not needed for the leaching of sugar beet

✖


View Answer Fine solids cannot be leached in a Pachuca tank

Pick out the wrong statement?


aPacked towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the possibility of tower wall collapse

✖


bPacked towers are preferred over plate towers for handling corrosive and foamy liquids

✖


cDiameter of randomly packed tower is normally more than 1.2 metres

✓


dDue to uneven supply and improper distribution of liquid, problem of channelling, loading & flooding is generally encountered in packed towers

✖


View Answer Diameter of randomly packed tower is normally more than 1.2 metres

Pick out the wrong statement ?


aDifferent solids have different equilibrium moisture curves

✖


bTotal condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of theoretical plate calculation for distillation column

✖


cHeat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column

✓


dEven a forced draft cooling tower cannot cool water below the wet bulb temperature

✖


View Answer Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column

Goto Page No.

Page 639 of 843

Alphabetical MCQs Categories
—

Here below You find all kind of categories of MCQs in alphabetical order.


"Comprehensive Collection of MCQs: Alphabetically Organized by Subject"
—

"Discover an extensive collection of multiple-choice questions (MCQs) neatly categorized by subject from A to Z. This resource is designed for anyone eager to explore various topics in a straightforward and organized manner. Whether you're a student preparing for exams, an educator seeking supplementary materials, or simply curious about different subjects, this compilation offers a convenient way to learn and assess your knowledge. With questions arranged alphabetically, navigation is effortless, allowing you to delve into subjects of interest at your own pace. Engage, learn, and expand your understanding with this accessible and comprehensive repository of MCQs!"

⚛ Agriculture MCQs
⚛ Artificial Intelligence MCQs
⚛ Accounting MCQs
⚛ Auditing MCQs
⚛ Biology MCQs
⚛ Biochemistry MCQs
⚛ Bioinformatics MCQs
⚛ Chemistry MCQs
⚛ Chemical Engineering MCQs
⚛ Civil Engineering MCQs
⚛ Computer MCQs
⚛ Computer Fundamentals MCQs
⚛ Computer Networks MCQs
⚛ Computer Organization and Architecture MCQs
⚛ Current Affairs (Pakistan)
⚛ Current Affairs (World)
⚛ Dental Materials MCQs
⚛ Database Management Systems MCQs
⚛ Data Structures and Algorithms-I MCQs
⚛ Data Structures and Algorithms-II MCQs
⚛ English MCQs
⚛ English Literature MCQs
⚛ Economics MCQs
⚛ Everyday Science MCQs
⚛ Electrical Engineering MCQs
⚛ Finance MCQs
⚛ General Knowledge MCQs
⚛ General Anatomy MCQs
⚛ Human Resource Managemeent(HRM) MCQs
⚛ Islamic Study MCQs
⚛ Judiciary And Law MCQs
⚛ Mathematics MCQs
⚛ Medical MCQs
⚛ Microbiology MCQs
⚛ Oral Anatomy MCQs
⚛ Oral Histology MCQs
⚛ Oral Pathology and Medicine MCQs
⚛ Object Oriented Programming MCQs
⚛ Operating System MCQs
⚛ Pakistan Study MCQs
⚛ Pedagogy MCQs
⚛ Physics MCQs
⚛ Pathology MCQs
⚛ Pharmacology MCQs
⚛ Physiology MCQs
⚛ Relational Database Management System MCQs
⚛ Software Engineering MCQs
⚛ Sociology MCQs
⚛ Statistics MCQs
⚛ Software Architecture & Design MCQs
⚛ Urdu MCQs


BolPakistan

bolpakistan.com.pk includes Job Mcqs and Pak Mcqs is the Top Largest Mcqs Forum in World, in which you can read Mcqs of All Subjects, PPSC test preparation, FPSC, NTS and PPSC PAST PAPERS, PPSC PAST MCQS. A Collection of Repeated MCQs for JOBs seekers.

Popular Posts

Software Engineering MCQs
Computer Networks MCQs
Computer MCQs
English Literature MCQs

Support

Terms & Conditions
Privacy Policy
Contact Us
About

Copyright © 2024, Designed & Developed by BolPakistan