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 : 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 : During sewage treatment, effluent from which one of the following treatment units has minimum wt/vol amount of suspended solids? (a) Detritus channel (b) Primary sedimentation tank (c) Secondary sedimentation tank (d) Activated sludge process aeration tank
Last Answer : (d) Activated sludge process aeration tank
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 : Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal (A) By chemical coagulation (B) In sedimentation tanks equipped with mechanical scrapper (C) In vacuum filter (D) In clarifiers
Last Answer : (B) In sedimentation tanks equipped with mechanical scrapper
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 : 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 : Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted waterstream? (A) Sedimentation tank (B) Circular clarifier (C) Mechanical flocculation (D) Chemical coagulation
Last Answer : (D) Chemical coagulation
Description : Chlorination of water is done for the removal of A. Bacterias B. Suspended solids C. Sediments D. Hardness
Description : Primary treatment of sewage consists of removal of A. Large suspended organic solids B. Oil and grease C. Sand and girt D. Floating materials
Description : What is a solution A. a solid dissolved in a gas B. a solute and a solvent C. a liquid dissolved in a gas D. an amalgam of solids, liquids, and gases?
Last Answer : B. A solute and a solvent
Description : Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by (A) Natural aeration of water stream (B) Photosynthetic action of algae (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Stabilisation of gasoline (petrol) means (A) Removal of dissolved gases from it (B) Increasing its oxidation stability (C) Improving its lead susceptibility (D) Increasing its vapour pressure
Last Answer : (A) Removal of dissolved gases from it
Description : Presence of __________ in water stream are deleterious to aquatic life. (A) Soluble and toxic organics (B) Suspended solids (C) Heavy metals and cyanides (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 : Dissolved carbon dioxide, can be removed from the supply main by (A) Sedimentation (B) Aeration (C) Chlorination (D) Coagulation
Last Answer : (B) Aeration
Description : Which of the following is the most lethal water pollutant? (A) Phenol and cyanide (B) Chlorine (C) Alkalis (D) Suspended solids
Last Answer : (A) Phenol and cyanide
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 : 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 : 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 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 : Tabular bowl centrifuges as compared to disk bowl centrifuges (A) Operate at higher speed (B) Employ bowl of larger diameter (C) Can’t be operated under pressure/vacuum (D) Can’t be used for separation of fine suspended solids from a liquid
Last Answer : (A) Operate at higher speed
Description : Which of the following is the most suitable filter for separation ofabrasive solids suspended in a corrosive liquid? (A) Sand bed filter (B) Plate and frame filter press (C) Vacuum filter (D) Batch basket centrifuge
Last Answer : (C) Vacuum filter
Description : A packed tower compared to a plate tower for a particular mass transfer operation (A) Incurs smaller pressure drop (B) Allows installation of cooling coils (C) Is less costly when built in large sizes/diameters (D) Is more suitable, if suspended solids are present in fluid stream
Last Answer : (A) Incurs smaller pressure drop
Description : When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used. (A) Mixture of two gases (B) Pure gas (C) Ideal gas (D) Sparingly soluble gas
Last Answer : (B) Pure gas
Description : The function of sedimentation tank in sewage treatment is to: (1) Disinfect the sewage (2) Remove water content (3) Aerate the sewage (4) Remove suspended solids
Last Answer : (4) Remove suspended solids Explanation: The function of sedimentation tank in the sewage treatment is to remove suspended solids.
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
Last Answer : Remove suspended solids
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
Description : The function of skimming tank in sewage treatment is to remove – (1) oil and fatty substances (2) suspended solids (3) gritty substances (4) inorganic substances
Last Answer : (1) oil and fatty substances Explanation: Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, ... content of wastewater rise to the surface of wastewater and remains on top of liquid until removed.
Description : Which of the following in sewage treatment removes suspended solids? (a) Secondary treatment (b) Primary treatment (c) Sludge treatment (d) Tertiary treatment
Last Answer : (b) Primary treatment
Description : Which of the following in sewage treatment removes suspended solids ? (1) Secondary treatment (2) Primary treatment (3) Sludge treatment (4) Tertiary treatment
Last Answer : (2) Primary treatment
Description : The function of skimming tank in sewage treatment is to remove (1) oil and fatty substances (2) suspended solids (3) gritty substances (4) inorganic substances
Last Answer : oil and fatty substances
Description : The ratio of dissolved solids in circulating water to the dissolved solids in makeup water is called a) Liquid gas ratio b) Cycle of concentration c) Cooling tower effectiveness d) None of the above
Last Answer : Cycle of concentration
Description : The ratio of dissolved solids in circulating water to dissolved solids in makeup water is called. • Liquid gas ratio • Cycle of concentration • Cooling tower effectiveness • None of the above
Description : An approximate estimation of total dissolved solids of a given water sample is often made by measuring (a) Electrical conductivity of the water sample (b) Electro-magnetic conductivity of the water sample (c) Sound conductivity of the water sample (d) Thermal conductivity of the water sample
Last Answer : (a) Electrical conductivity of the water sample
Description : With regard to standard of quality of drinking water as laid down by Indian Railway , the requirement (desirable) limit of total dissolved solids should not be more than---------- mg/l a)200 b) 300 c) 400
Last Answer : d) 500*
Description : Which of the following parameters is not used as a pollution indicator in water? (A) Total dissolved solids (B) Coliform count (C) Dissolved oxygen (D) Density
Last Answer : Answer: D
Description : The concentration of Total Dissolved Solids (TDS) in drinking water should not exceed (A) 500 mg/L (B) 400 mg/L (C) 300 mg/L (D) 200 mg/L
Last Answer : (A) 500 mg/L
Description : Which is the most practical and economical method for removal of suspended solid matter from polluted water? (A) Sedimentation (B) Skimming off (C) Chlorination (D) Biological oxidation
Last Answer : (A) Sedimentation
Description : Most widely and commonly used coagulant for the removal of suspended impurities in water is (A) Bleaching powder (B) Slaked lime (C) Alum (D) Copper sulphate
Last Answer : (C) Alum
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 : Which is not accomplished in an underfired furnace? (A) Increase in heating capacity/m2 of floor space (B) Elimination of cold spot at the bottom of the charge (C) Reduction in the temperature of furnace gases (D) Protection of the periphery of the charge from excessive radiation
Last Answer : (A) Increase in heating capacity/m2 of floor space
Description : Infective bacteria in water is killed by the __________ process. (A) Sterilisation (B) Aeration (C) Disinfection (D) None of these
Last Answer : (A) Sterilisation
Description : Pick out the wrong statement. (A) Different solids have different equilibrium moisture curves (B) Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of ... (D) Even a forced draft cooling tower cannot cool water below the wet bulb temperature
Last Answer : (C) Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column
Description : is the measure of whether a plant is now using more or less energy to manufacture its product than it did in the past. a) Total Dissolved Solids (TDS). c) Plant Energy Performance (PEP) b) Revolutions Per Minute (RPM) d) Option (a) and (b)
Last Answer : Plant Energy Performance (PEP)
Description : is the measure of whether a plant is now using more or less energy to manufacture its product than it did in the past. a) Total Dissolved Solids (TDS) b) Plant Energy Performance (PEP) c) Revolutions Per Minute (RPM) d) Option (a) and (b)