Tri-sodium phosphate is used in boiler water treatment to reduce
(A) Turbidity
(B) Caustic embrittlement
(C) Suspended silica
(D) Dissolved oxygen

1 Answer

Answer :

(B) Caustic embrittlement

Related questions

Description : Deaeration of high pressure boiler feed water is done to reduce (A) Foaming from boilers (B) Its dissolved oxygen content (C) Its silica content (D) Caustic embrittlement

Last Answer : (B) Its dissolved oxygen content

Description : Pick out the wrong statement. (A) Caustic embrittlement of boiler's metallic parts is caused by highconcentration of caustic soda in boiler feed water (B) Cooling and freezing of water kills the ... goes on decreasing (D) Dissolved oxygen content in high pressure boiler feed water should be nil

Last Answer : (B) Cooling and freezing of water kills the bacteria present in it

Description : The most detrimental impurity in high pressure boiler feed water is (A) Suspended salt (B) Dissolved salt (C) Silica (D) Turbidity

Last Answer : Option C

Description : Which of the following is the most detrimental for water used in high pressure boiler? (A) Silica (B) Turbidity (C) Phenol (D) Dissolved oxygen

Last Answer : (A) Silica

Description : Which of the following impurities in feed water for high pressure boiler is the most detrimental? (A) Silica (B) Dissolved oxygen (C) Suspended salt (D) Dissolved salt

Last Answer : (A) Silica

Description : The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________ a) Foaming b) Priming c) Corrosion d) Caustic embrittlement

Last Answer : d) Caustic embrittlement

Description : Which of the following is not a result of the excess of impurity in boiler-feed. a) Scale and sludge formation b) Decomposition c) Corrosion, priming and foaming d) Caustic embrittlement

Last Answer : b) Decomposition

Description : Turbidity of water is an indication of the presence of (A) Suspended inorganic matter (B) Dissolved solids (C) Floating solids (D) Dissolved gases

Last Answer : (A) Suspended inorganic matter

Description : Hydrazine is used in water treatment for the removal of (A) Colloidal impurities (B) Dissolved oxygen (C) Turbidity (D) Chlorinous taste

Last Answer : (B) Dissolved oxygen

Description : Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low (A) Hardness (B) Dissolved solids content (C) Suspended solids content (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Which of the following is an example of stress corrosion? (A) Season cracking of brass (B) Caustic embrittlement of steel (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : Option C

Description : The best guide to judge the general quality of water is the measurement of its (A) pH value (B) Electrical conductivity (C) Turbidity (D) Dissolved oxygen content

Last Answer : (B) Electrical conductivity

Description : The domestic sewage in large cities (a) has a high BOD as it contains both aerobic and anaerobic bacteria (b) is processed by aerobic and then anaerobic bacteria in the secondary treatment in ... sewage contains adequate oxygen (d) has very high amount of suspended solids and dissolved salts.

Last Answer : (b) is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)

Description : The propulsion of water into steam drum by extremely rapid, almost explosive boiling of water at the heating surface is called ___________ a) Foaming b) Priming c) Corrosion d) Caustic embrittlement

Last Answer : b) Priming

Description : What is caustic embrittlement ?

Last Answer : It is the actual physical change in metal that makes it extremely brittle and filled with minute cracks. It occurs particularly in the seams of rivetted joints and around the rivet holes.

Description : Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium (A) Carbonate (B) Phosphate (C) Bicarbonate (D) Silicate

Last Answer : (A) Carbonat

Description : Sodium tri poly phosphate (STPP) is chemically represented as (A) Na5P3O10 (B) Na4P3O8 (C) Na3P4O6 (D) Na2PO4

Last Answer : (A) Na5P3O10

Description : Can you use tri sodium phosphate to clean medium gloss painted walls?

Last Answer : um just buy paint thinner

Description : Lagoons used for purification of polluted water (A) Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds (B) Use micro-organisms/bacteria in presence of dissolved oxygen (C) Gives an ... 1 mg/litre and BOD = 3.8 mg/litre (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Description : The function of skimming tank in sewage treatment is to remove __________ substances. (A) Dissolved solid (B) Suspended solid (C) Oil & fatty (D) Gritty & inorganic

Last Answer : (C) Oil & fatty

Description : The resistance of water to the passage of light through it is a measure of the (A) Turbidity (B) Color (C) Hardness (D) Dissolved gases

Last Answer : (A) Turbidity

Description : The effluent of a septic tank is A. Fit for discharge into any open drain B. Foul and contains dissolved and suspended solids C. As good as that from a complete treatment D. None of these

Last Answer : ANS: A

Description : Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water. (A) Turbidity (B) Color (Hazen) (C) Total solids (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Description : Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided  (A) Silica  (B) Mud  (C) Clay  (D) Organic matter 

Last Answer : (A) Silica 

Description : Consider the following statements. The following factors relate to the process of coagulation : 1. Percentage removal is higher when turbidity is more 2. Additional of activated silica aids in the process of coagulation 3. pH of water ... 1, 2 and 3 b) 1 and 2 only c) 2 and 3 only d) 1 and 3 only

Last Answer : a) 1, 2 and 3

Description : Turbidity of water may be caused due to  (A) Suspended clay  (B) Suspended silt  (C) Finely divided organic material  (D) All the above 

Last Answer : (D) All the above 

Description : Turbidity of raw water is a measure of  (A) Suspended solids  (B) Acidity of water  (C) B.O.D.  (D) None of these 

Last Answer : (A) Suspended solids

Description : On nephelometry turbidity unit (NTU) is equal to the turbidity produced by (a) 1 mg SiO2 dissolved in 1 l of distilled water with the test being run according to absorption principle (b) 1 ... Formazin dissolved in 1 l o f distilled water with the test being run according to scattering principle.

Last Answer : (d) 1 mg Formazin dissolved in 1 l o f distilled water with the test being run according to scattering principle.

Description : H2S is scrubbed from refinery gases by absorption using (A) Dilute H2SO4 (B) Ethanol amine (C) Chilled water (D) Tri-butyl phosphate

Last Answer : (B) Ethanol amine

Description : 20 gram of caustic soda are dissolved in water to prepare 500 ml of solution. Find the normality and molarity of solution.

Last Answer : Basis: 500 ml solution. Weight of solute = 20 gm Molecular weight of NaOH = 40 Gram moles of solute = 20/40 = 0.5 Molarity = Gram moles/ Volume of solution in lit  0.5/0.5 = 1 M Normality = gram equivalent of solute/ volume of solution in lit  = 0.5/0.5 = 1N 

Description : Scale formation in boiler is controlled by (A) Preheating of feed water (B) Reduction in hardness, silica & alumina in feed water (C) Keeping the pH value of feed water just below 7 (D) Eliminating H2S in feed water

Last Answer : (B) Reduction in hardness, silica & alumina in feed water

Description : Soluble silica present in boiler feed water can be removed by (A) Coagulation (B) Filtration (C) Anion exchanger (D) Preheating it

Last Answer : (C) Anion exchanger

Description : Removal of __________ is accomplished by aeration of water. (A) Dissolved gases (B) Suspended solids (C) Dissolved solids (D) None of these

Last Answer : (A) Dissolved gases

Description : Write a note on ATP (Adenosine Tri-Phosphate). -Biology

Last Answer : answer:

Description : . Dechlorination of treated water is necessary to (A) Remove residual turbidity (B) Reduce the bacterial load on filter (C) Control taste and odour (D) Remove chlorinous taste

Last Answer : (D) Remove chlorinous taste

Description : Calgon used in water treatment is chemically (A) Sodium phosphate (B) Sodium hexametaphosphate (C) Calcium phosphate (D) Tricresyl phosphate

Last Answer : (B) Sodium hexametaphosphate

Description : Corrosion in boilers can be prevented by (A) Deaeration of feed water (B) Enhancing pH of feed water by adding alkali (C) Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Which of the following is not a feature of potable water? a) It must be clean, colourless and odourless. b) It must be free from bacteria c) It must have excessive sodium ,calcium and magnesium d) It must contain dissolved oxygen and carbon dioxide

Last Answer : c) It must have excessive sodium ,calcium and magnesium

Description : Ground water from artesian wells (A) Contains no suspended materials (B) Contains dissolved salts (C) May be saltish and hard (D) All the above

Last Answer : (D) All the above

Description : The optical property of a water body depends on: (A) Absorption by the dissolved material (B) Absorption by the suspended particulate matter (C) Scattering by the suspended particulate matter (D) All of these

Last Answer : Answer: Option D

Description : Specific weight of sea water is more that of pure water because it contains (A) Dissolved air (B) Dissolved salt (C) Suspended matter (D) All of the above

Last Answer : Answer: Option D

Description : Deaeration of water in its treatment is necessary, as it (A) Minimises its turbidity (B) Helps in controlling its taste and odour (C) Minimises its corrosiveness (D) None of these

Last Answer : (C) Minimises its corrosiveness

Description : Alum [Al2 (SO4 )3 ] is used as a coagulant in water treatment to remove (A) Colour (B) Turbidity (C) Bacteria (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Pick out the true statement pertaining to water treatment. (A) Slow sand filters can remove colour completely (B) Activated carbon can be used for taste & odour control without subsequent filtration ... of water (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation

Last Answer : (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation

Description : The main use of activated carbon in water treatment is to control (A) Bacterial growth (B) Taste and odour (C) Turbidity (D) None of these

Last Answer : (B) Taste and odour

Description : Chloramines are used in water treatment for (A) Disinfection and control of taste & odour (B) Corrosion control (C) Removing turbidity (D) Control of bacteria

Last Answer : (A) Disinfection and control of taste & odour

Description : Electric furnace method for production of phosphorous uses phosphate rock and __________ (A) Phosphoric acid (B) Coke (C) Sulphuric acid (D) Silica and coke

Last Answer : (D) Silica and coke

Description : In domestic sewage, suspended solids, colloidal and dissolved materials constitute

Last Answer : In domestic sewage, suspended solids, colloidal and dissolved materials constitute A. 0.1 B. 0.056 C. 0.027 D. 0.001

Description : If the President of India exercises his power as provided under Article 356 of the Constitution in respect of a particular State, then - (1) the Assembly of the State is automatically dissolved. (2) ... Article 19 is suspended in that State. (4) the President can make laws relating to that State.

Last Answer : (2) the powers of the Legislature of that State shall be exercisable by or under the authority of the Parliament. Explanation: The President's Rule can be proclaimed under Article 356... He can declare ... of the state legislature are to be exercised by the Parliament. So "B" is the right answer.

Description : Imhoff cone is used to determine A. Settleable solids B. Suspended solids C. Dissolved solids D. None of these

Last Answer : ANS: A