What is the substance, present in a larger quantity that. Semipermeable membrane allows ____________. Explanation: The quantity of calgon to be added to prevent scale and sludge formation is 0.5-5 ppm. Under-specification of boundary conditions gives rise to _____________. (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. It is used for high and low pressure boilers. The original product consisted of powdered sodium hexametaphosphate (amorphous sodium polyphosphate), which in water would complex with ambient calcium ion and certain other cations, preventing formation of unwanted salts and interference by those cations with the actions of soap or other detergents. Your email address will not be published. Iron oxide and copper depositions can be prevented by adding ___________ to the boiler water.a) Calgonb) Carbonatec) EDTAd) EBTAnswer: cClarification: Iron oxide and copper depositions can be prevented by adding EDTA to the boiler water. It is characterized by the formation of irregular intergranular cracks on the boiler metal, particularly at places of high local stress such as bends and joints. 9. This method is used to convert scale to sludge which can be removed by blow-down operation. For CY6251 CHEM 2 Previous Year Question Papers Click here The chemicals added for this purpose are called Boiler compounds. Is calgon conditioning applicable to low or high pressure boilers or both? Treatment for water softening. Probably, its most important use as an engineering material is in the, .Water is also used a coolant in power and chemical plants. Explanation: Calgon converts the scale forming impurity like CaSO4 into soluble complex compound which are harmless to boiler. Caustic embrittlement is the phenomenon in which the material of a boiler becomes brittle due to the accumulation of caustic substances. What is used for calgon conditioning? Engineering Chemistry Questions and Answers - Calgon Conditioning. Which statement describes a managerial action that does not unethically? Anna University Regulation 2013 Information Technology (IT) CY6251 CHEM 2 Notes for all 5 units are provided below. Calgon prevents limescale build-up in washing machines all over the world to protect the heating element, pipes and drum of the machines. this soluble complex does not cause any problem in boilers. If the precipitation takes place in the form of loose and slimy precipitate, it is called sludge. The action you just performed triggered the security solution. A boiler is an enclosed vessel that provides a means for combustion heat to be transferred into water until it becomes heated water or steam. At room temperature, the impure compound in crystallisation is ____________, Calgon converts the scale forming impurity like CaSO4 into ___________, Electron cryomicroscopy is used mainly for _______________. Permanent hardness is due to presence of dissolved chlorides and sulphates of, Calcium, Magnesium and other heavy metals. What is Calgon?a) Potassium hexa meta sulphateb) Magnesium hexa meta phosphatec) Sodium hexa meta phosphated) Calcium hexa meta sulphateAnswer: cClarification: Calgon is sodium hexa meta phosphate. On the other hand, if the precipitated matter forms a hard, adhering crust/coating on the inner walls of the boiler, it is called scale. We use cookies to ensure that we give you the best experience on our website. Four different kinds of cryptocurrencies you should know. Calgon conditioning f Carbonate conditioning For a salt to get precipitated the ions constituting the salt must be present in sufficient concentration so that the product of their concentrations (i.e. Water: Introduction, Hardness: Causes, expression of hardness - units - types of hardness. Mono sodium di hydrogen phosphate NaH2PO4 (acidic) used for alkaline acidic water. to boiler water in order to prevent the scale formation. Calgon Conditioning Specification for potable water as per Bureau of Calgon is Sodium hexa meta phosphate i.e. Calgon conditioning involves the addition of Calgon or sodium hexametaphosphate to boiler water. ii) Lowering of boiler safety: To supply steady heat overheating is required, which makes the boiler material weak &soft. Hence calgon conditioning is better than phosphate conditioning. The water which does not produce lather with soap. All these Ca, salts (weather they are formed due to the reaction of Mg salts, or they are present in as. Calgon prevents limescale build-up in washing machines all over the world to protect the heating element, pipes and drum of the machines. This can be removed by boiling. The most important use of water as an engineering material is in the steam generation. The sum of temporary and permanent hardness is, The concentration of hardness as well as non-hardness constituting ions are, usually, expressed in terms. 250+ TOP MCQs on Lime Soda Process and Answers, 250+ TOP MCQs on Organic Chemistry Quantitative Analysis and Answers, 300+ TOP Pharmaceutical Inorganic Chemistry MCQs and Answers, 250+ TOP MCQs on Pipette Method and Answers, 250+ TOP MCQs on Electroplating Baths 2 and Answers, 250+ TOP MCQs on Qualitative Analysis of Organic Compounds and Answers, 250+ TOP MCQs on Ion Exchange Process and Answers, 250+ TOP MCQs on Analog Signal Conditioning Bridge Circuits 1 and Answers, 250+ TOP MCQs on Solar Refrigeration and Air-Conditioning Systems 2 and Answers, 250+ TOP MCQs on Soil-Cement Stabilization and Answers, 250+ TOP MCQs on s-Block Elements Important Compounds of Calcium and Answers, 250+ TOP MCQs on Ingredients of Cement and Answers, 250+ TOP MCQs on Problems, Units and Formulae and Answers. This is, also known as non-carbonate or non alkaline hardness. and form insoluble precipitates of Ca or Mg salts of fatty acids. At room temperature, the impure compound in crystallisation is ____________, Electron cryomicroscopy is used mainly for _______________. Calgon conditioning: Calgon = sodium hexa meta phosphate The process involves the addition of calgon to boiler water. It is also known as non carbonate or non alkaline hardness. The hardness of, water is due to presence of calcium and magnesium salts. It is also known as carbonate, This type of hardness cannot be removed by simple. How does Calgon conditioning work in boiler water? Required fields are marked *. It is formed by the reaction of sodium ortho-phosphate with calcium salts. What is the difference between air conditioning and refrigeration? Due to lack of chain entanglement, dendrimers usually have low. What is defined as the concentration of dissolved solute in. On which of the following factors diffusion does not depend? The hot water or steam under pressure is then usable for transferring the heat to a process. Home Engineering Chemistry Objective Questions 250+ TOP MCQs on Calgon Conditioning and Answers. The time for answering the question is over. To browse Academia.edu and the wider internet faster and more securely, please take a few seconds toupgrade your browser. Calgon converts the scale forming impurity like CaSO 4 into ___________ a) Soluble complex compound b) Insoluble complex compound c) Soluble acids d) Insoluble acids View Answer 4 - Question The quantity of calgon to be added to prevent scale and sludge formation is ___________ a) 10-20 ppm b) 30-50 ppm c) 0.005-0.1 ppm d) 0.5-5 ppm View Answer estimation of temporary & permanent hardness of water. The reactions involved in this process are as follows: It is evident from the above equations that when permanent hardness producing, magnesium salts reacted with lime, produces Mg(OH), as a by product(refer eq. This substance reacts with calcium ions and forms highly soluble complex and thus prevents the precipitation of scale forming salt. This can remove hardness only up to 15 ppm, which is not good for boilers. When some chemical is mixed with water, _________ is formed. Engineering 2023 , FAQs Interview Questions. Calgon converts the scale forming impurity like CaSO4 into ___________ Electron cryomicroscopy is used mainly for _______________ Dilution means an increase in the amount of ____________ Absorbers have a lean end of Semipermeable membrane allows ____________ When some chemical is mixed with water, _________ is formed. The significant role played by bitcoin for businesses! Tech I semester ENGINEERING CHEMISTRY (Common for all Branches, Pakistan Steel Boiler operation & Water treatment.pdf, Engineering Chemistry Notes For vtu students (Common to all Branches) (Effective from the academic year 2010-11) Subject Code: (10CHE12/22, ENGINEERING CHEMISTRY FIRST SEMESTER UNIT I Molecular Mass, Equivalent Mass, Acids and Bases and Chemical Bonding UNIT-II SOLUTION, TECHNOLOGY OF WATER AND SOLID STATE 1.1 MOLECULAR MASS 4 Hrs 2.1 SOLUTION 4 Hrs 2.2 TECHNOLOGY OF WATER 7 Hrs, [usebooks.blogspot.com] chemistry by jain and jain, ENGINEERING CHEMISTRY UNIT -I WATER AND ITS TREATMENT PART A 1. This problem can be solved by adding coagulants like, to the water. Advertisement Brainly User Answer: Calgon converts the scale forming impurity like CaSO4 into 1 Colour, Odour, Taste Colourless, Odourless and Tasteless soluble . . Explanation: The quantity ofcalgon tobe addedtopreventscaleand sludgeformationis 0.5-5 ppm. Calgon conditioning: It is the process of addition of calgon or sodium hexametaphosphate to boiler feed water. It is also used as a coolant in power and chemical plants. Calgon prevents limescale build-up in washing machines all over the world to protect the heating element, pipes and drum of the machines. Colloidal conditioning The colloidal conditioning agents are kerosene, agar-agar, gelatin, glue, etc. Na 2[Na 4(PO 3) 6] + 2CaSO 4 Na 2[Ca 2(PO 3) 6 . 4. The colloidal substances convert scale forming substance like CaCO3, CaSO4 into a Non-adherent, loose precipitate called sludge, which can be removed by blow-down Operation. Producing quality steam on demand depends on properly managed water treatment to control steam purity, deposits and corrosion. Only about, 0.3% of the worlds water resources can be trapped by man for domestic, agricultural. 1. View Answer Calgon is added to boiler water to prevent ___________ Options A : Foaming B : Sludge and scale formation C : Priming D : Corrosion View Answer Calgon conditioning is not applicable for the prevention of ___________ Options A : Iron oxide only B : Copper depositions only C : Sulphurdioxide only D : Iron oxide and copper depositions Calgon conditioning is not applicable for the prevention of ___________a) Iron oxide onlyb) Copper depositions onlyc) Sulphurdioxide onlyd) Iron oxide and copper depositionsAnswer: dClarification: Calgon conditioning is not applicable to the prevention of iron oxide and copper depositions. Find molar masses and chemical equivalents of hardness producing substance. 4. These salts react with soap. Sorry, preview is currently unavailable. Calgon converts the scale forming impurity likeCaSO4intosoluble complex compound which are harmlesstoboiler. Water is a useful and cheap medium for transferring heat to a process. Hence calgon conditioning is better than phosphate conditioning.
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