Chemical Engineering MCQs

Page No. 576

For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is ___________________?


a1

✖


b> 1

✖


c∞

✓


d≥ 1

✖


View Answer ∞

The energy of activation of a chemical reaction ?


aIs same as heat of reaction at constant pressure

✖


bIs the minimum energy which the molecules must have before the reaction can take place

✓


cVaries as fifth power of the temperature

✖


dBoth B. and C.

✖



If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst___________________?


aPorosity is very important

✖


bPorosity is of less importance

✓


cInternal surface area is utilised efficiently

✖


dNone of these

✖



With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be__________________?


aHigher in P.F. reactor

✓


bHigher in CSTR

✖


cSame in both the reactors

✖


dData insufficient; can’t be predicted

✖



Space time in flow reactor is____________________?


aUsually equal to the residence time

✖


bThe reciprocal of the space velocity

✖


cA measure of its capacity

✖


dBoth A. and B.

✓


View Answer Both A. and B.

The rate of reaction does not decrease appreciably as the reaction proceeds in case of ______________ reactions?


aAutocatalytic

✓


bAutocatalytic

✖


cEndothermic

✖


dAutothermal

✖


View Answer Autocatalytic

The order of a chemical reaction is__________________?


aAn experimentally determined quantity

✓


bAlways equal to the total stoichiometric number of reactants

✖


cNever fractional

✖


dNone of these

✖



The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the_________________?


aIncreased temperature reduces the activation energy

✖


bFraction of molecules having threshold energy increases

✓


cCollision frequency increases

✖


dValue of threshold energy decreases

✖



In an ideal P.F.R. at steady state conditions ___________________?


aThe composition of reactants remains constant along a flow path

✖


bThe conversion of the reactant varies from point to point along a flow path

✓


cThere is no lateral mixing of fluid

✖


dThere may be diffusion along the flow path

✖



Promoter_____________________?


aInitiates a chemical reaction and is a catalyst by itself

✖


bAlters the position of equilibrium in a reversible reaction

✖


cIncreases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals

✓


dAll A., B. and C.

✖



Goto Page No.

Page 576 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