Chemical Engineering MCQs

Page No. 440

Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the _____________ zone?


aLaminar

✖


bTransition

✖


cBoth A & B

✖


dHighly turbulent

✓


View Answer Highly turbulent

Which of the following is unimportant in forced convection ?


aReynolds number

✖


bPrandtl number

✖


cGrashoff number

✓


dNone of these

✖


View Answer Grashoff number

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?


aC/E

✓


bE/C

✖


cCE

✖


d1/CE

✖


View Answer C/E

Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?


aPrandtl number

✓


bGrashoff number

✖


cThermal conductivity

✖


dViscosity

✖


View Answer Prandtl number

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is – 5°C. The outside wall temperature is___________________?


a25°C

✖


b30°C

✖


c35°C

✓


d40°C

✖


View Answer 35°C

In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to _____________ the velocity head?


aTwice

✖


bFour times

✓


cSquare root of

✖


dSquare of

✖


View Answer Four times

Heat produced when a steady state current, I passes through an electrical conductor having resistance, ‘R’ is___________________?


aIR

✖


bI2R

✓


cIR2

✖


dI2R2

✖


View Answer I2R

The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by__________________?


aPainting the surface black

✖


bPainting the surface white (with aluminium paint)

✓


cGiving the surface a mirror finish

✖


dRoughening the surface

✖



Fourier’s law applies to the heat transfer by__________________?


aConvection

✖


bRadiation

✖


cConduction

✓


dAll A., B. & C.

✖


View Answer Conduction

As per Kirchoff‟s law, the ratio of the total radiating power to the absorptivity of a body depends on the_______________?


aTemperature of the body only

✓


bWavelength of monochromatic radiation

✖


cBoth A. and B.

✖


dNature of material of body

✖



Goto Page No.

Page 440 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