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 : Which of the following is the most detrimental for water used in high pressure boiler? (A) Silica (B) Turbidity (C) Phenol (D) Dissolved oxygen
Description : Tri-sodium phosphate is used in boiler water treatment to reduce (A) Turbidity (B) Caustic embrittlement (C) Suspended silica (D) Dissolved oxygen
Last Answer : (B) Caustic embrittlement
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 : 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 : 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 : 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 : 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 : 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 : The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water. (A) Dissolved oxygen content (B) Biological oxygen demand (C) Vapor pressure (D) All (A), (B) and (C)
Last Answer : (A) Dissolved oxygen content
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 : 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 : 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 : 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 : 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 : 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
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 : The temperature of boiling water in a steam engine may be high because - (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the lire is at very high temperature
Last Answer : (3) there is high pressure inside the boiler Explanation: In the boiler of a steam engine, there is a firebox where coal is shoveled into. The coal is kept burning at a very high temperature, and ... reservoir; the steam is then controlled by a slide valve to move into a cylinder to push the piston.
Description : The temperature of boiling water in a steam engine may be high because : (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the fire is at very high temperature
Last Answer : there is high pressure inside the boiler
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 : 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 : 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)
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 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 delivery pressure of boiler feed water pump compared to the boiler steam pressure is (A) Same (B) Slightly less (C) Slightly more (D) Much more
Last Answer : (C) Slightly more
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
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
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
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
Description : Boiler feed water pump is usually a __________ pump. (A) Reciprocating (B) Gear (C) Multistage centrifugal (D) Diaphragm
Last Answer : (C) Multistage centrifugal
Description : In the context of the chemical process industries, the term BOD is normally associated with the (A) Characterisation of solid wastes (B) Organic concentration in gaseous effluents (C) Characterisation of liquid effluents (D) Characterisation of boiler feed water
Last Answer : (C) Characterisation of liquid effluents
Description : Widely used method for the conditioning of boiler feed water is the (A) Cold lime process (B) Coagulation (C) Hot-lime soda process (D) Sequestration
Last Answer : (C) Hot-lime soda process
Description : The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the (A) Water alkalinity & leakage (B) Hydrazine addition during ... treatment (C) Release of non-condensable gas from water in the boiler (D) Scale formation
Last Answer : (C) Release of non-condensable gas from water in the boiler
Description : Which of the following is a boiler accessory i.e., not a boiler mounting? (A) Blow off cock (B) Feed check valve (C) Feed water pump (D) Stop valve
Last Answer : (C) Feed water pump
Description : Brackish water which contains mostly dissolved salt, can be purified by the __________ process. (A) Reverse osmosis (B) Sand filter (C) Lime soda (D) Permutit
Last Answer : (A) Reverse osmosis
Description : Clay treatment is used to remove (A) Salt from the crude oil (B) Colour & dissolved gases from cracked gasoline (C) Wax from lube oil (D) None of these
Last Answer : (C) Wax from lube oi
Description : Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an (A) Blast furnace (B) Steam boiler (C) Salt bath furnace (D) Annealing furnace
Last Answer : (C) Salt bath furnace
Description : How dissolved oxygen control is achieved in feed water system?
Last Answer : Hydrazine is added to feed water system to control dissolved oxygen.
Description : Economizer is provided to utilize the flue gas heat for ___ a) preheating the boiler feed water b) preheating the stock c) preheating the combustion air d) preheating fuel
Last Answer : preheating the boiler feed water
Description : Where is water steam separator drum located in Lamont boiler ? a. Inside of the boiler b. Right above the furnace c. Before the feed water pump d. Outside the boiler
Last Answer : d. Outside the boiler
Description : Through which does the even circulation of water is possible in Lamont boiler ? a. Nozzles b. Water trough c. Feed pump d. Hose
Last Answer : a. Nozzles
Description : Through what is feed water from hot-well is passed through, before entering steam and water drum in Lamont boiler? a. Evaporator tubes b. Economizer c. Distributor header d. Circulating pump
Last Answer : b. Economizer
Description : In Drum type Boiler Feed water flow control by Three element controller a. Drum level b. Steam Flow c. Feed water flow d. All of above
Last Answer : Ans:- d. All of above
Description : Draw the diagram for zeolite process used for the softening of boiler feed water.
Last Answer : Zeolite process:
Description : Surface preparation for Metallising the abrasives used for final cleaning is a) Chilled iron grit G.24, as defined in BS : 2451 b) Washed salt free angular silica sand of mesh size 12 to 30 with a minimum of 40% retained on a 20 mesh c) either (a) or (b) * d) d) neither (a) or (b)
Last Answer : c) either (a) or (b) *