Chemical Engineering MCQs

Page No. 456

A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?


a6


b12


c18


d24


View Answer 12

Temperature profile in steady state heat transfer is________________?


aAsymptotic


bHyperbolic


cParabolic


dLinear


View Answer Linear

Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around _____________ metres/second?


a1


b10


c20


d30


View Answer 1

A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun ?


aYellow paint


bWhite paint


cBlack paint


dGrey paint


View Answer Black paint

Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?


a40


b95


c70


d50


View Answer 70

The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of ‘n’ is exactly 4 for__________________?


aBlack painted bodies only


bAll bodies


cPolished bodies only


dA black body


View Answer All bodies

Evaporation by thermo compression results in the _________________________?


aSaving of steam


bRealisation of multiple effect economy in a single effect


cBoth A. and B.


dNone of these


View Answer Both A. and B.

Use of transverse baffles in a shell and tube heat exchanger is done to increase the___________________?


aRate of heat transfer


bFlow velocity


cTurbulence of shell side fluid


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following situations can be approximated to a steady state heat transfer system ?


aA red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmospheric air at 35°C


b10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C


cBoiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C


dA sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C



Heat transfer by ____________ may not necessarily require the presence of a medium?


aConduction


bNatural convection


cForced convection


dRadiation


View Answer Radiation

Goto Page No.

Page 456 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