Chemical Engineering MCQs

Page No. 53

Pick out the wrong statement. A. Caustic embrittlement of boiler’s metallic parts is caused by high concentration of caustic soda in boiler feed water___________________?


aCooling and freezing of water kills the bacteria present in it


bWith increasing boiler operating pressure of steam, the maximum allowable concentration of


csilica in feed water goes on decreasing


dDissolved oxygen content in high pressure boiler feed water should be nil



Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent___________________?


aDental cavities


bScale formation


cWater-borne disease


dCorrosion


View Answer Dental cavities

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?


a Coagulation and flocculation of colloids


bOxidation of carbonaceous matter to CO2


cNitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter


dAll A., B. and C.


View Answer All A., B. and C.

TLV of mercury in potable (drinking) water is about ______________ ppm?


a 0.001


b0.1


c1


d5


View Answer 0.001

Presence of iron and manganese in water causes___________________?


aReduction in its dissolved oxygen content


bDiscoloration of bathroom fixtures


cTemporary hardness


dNone of these



Presence of soluble organics in polluted water causes_________________?


aUndesirable plants growth


bDepletion of oxygen


cFire hazards


dExplosion hazards



Persons working in cement plants and limestone quarries are more prone to disease like__________________?


aCancer


bAsthma


cSilicosis


d Fluorosis (bone disease)


View Answer Silicosis

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?


aBacterial stability factor


bRelative stability


cBiological oxygen demand (BOD)


dOxygen ion concentration


View Answer Relative stability

Siderosis is a disease caused by the inhalation of ______________ dust?


aCoal


bSilica


cIron


dNone of these


View Answer Iron

Lagooning process is mainly a means of the__________________?


aSludge disposal


bReduction of excessive flow in sewers


cBiological treatment of wastes


dNone of these


View Answer Sludge disposal

Goto Page No.

Page 53 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