Chemical Engineering MCQs

Page No. 638

If moisture content of solid on dry basis is X, then the same on wet basis is____________________?


aX/(X + 1)

✓


bX/(1 – X)

✖


c(1 + X)/X

✖


d(1 – X)/X

✖


View Answer X/(X + 1)

For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because__________________?


aWater has a high latent heat of evaporation

✓


bLewis number is close to unity

✖


cThey are always equal under all circumstances

✖


dSolubility of the components of air in water is very small

✖



In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as_____________________?


aRi = Re/(1 – Re)

✖


bRi = (1 – Re)/Re

✖


cRi = Re

✖


dRi = Re/(1 + Re)

✓


View Answer Ri = Re/(1 + Re)

Separation of two or more components of a liquid solution cannot be achieved by___________________?


aFractional crystallisation

✖


bLiquid extraction

✖


cAbsorption

✓


dEvaporation

✖


View Answer Absorption

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when____________________?


aExtracting solvent is cheaply & abundantly available

✖


bOne of the liquid components is heat sensitive

✖


cViscosity of liquid components is very high

✖


dOne of the liquid components has very high affinity towards the solvent

✓



If the amount of the steam used in steam distillation is increased, the temperature of distillation__________________?


aIncreases

✖


bDecreases

✓


cRemains unchanged

✖


dDepends on relative volatility

✖


View Answer Decreases

An example of elution is______________________?


aSeparation of uranium oxide from its ore by H2SO4 in a Pachuca tank

✓


bSeparation of sugar from sugar beet by hot water

✖


cDissolution of tannin out of tree barks by water

✖


dRecovery of vegetable oils from seeds

✖



Pick out the wrong statement?


aThe binary diffusivity in liquids is of the order of 10-5 cm2/sec

✖


bMolecular diffusion in solid is much faster than that in liquids

✓


cParticles movement from higher concentration to lower concentration takes place in diffusion process

✖


dAccording to Poiseuille’s law, the permeability decreases with increase in temperature for flow of a gas through a given capillary

✖



Pick out the wrong statement pertaining to the cooling towers ?


aIn case of induced draft cooling tower, the fan is placed at the top of the tower

✖


bEffectiveness of forced draft cooling tower is reduced by the recirculation of the humid and hot discharged air

✖


cA natural draft cooling tower is recommended to be used, when the air humidity is low and air temperature is also low

✖


dEffectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

✓



Pick out the wrong statement?


aChange in barometric pressure does not affect the relative humidity

✖


bIn case of a packed tower, the operating velocity is about half of the flooding velocity, generally

✖


c‘Elution’ means the desorption of the adsorbed solute by a solvent

✖


dThe equilibrium moisture content of the solid can be reduced by increasing the absolute humidity

✓



Goto Page No.

Page 638 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!"


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.

Copyright © 2024, Designed & Developed by BolPakistan