Description : Which of the following dust collection equipments is the least efficient (for sub-micronic particles)? (A) Dust catcher (gravity type) (B) Cyclone separator (C) Bag filter (D) Hollow wet scrubber
Last Answer : (A) Dust catcher (gravity type)
Description : Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the (A) Gravity settling chamber (B) Cyclone separator (C) Electrostatic precipitator (D) Bag filter
Last Answer : (C) Electrostatic precipitator
Description : . The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an (A) Bag filter (B) Electrostatic precipitator (C) Cyclone separator (D) Wet scrubber
Last Answer : (B) Electrostatic precipitator
Description : Which of the following fine dust removal equipments is the most efficient? (A) Bag filter (B) Scrubber (C) Electrostatic precipitator (D) Cyclone separator
Description : In the cyclone separator used for separation of dust from dust laden gas, the gas (A) Enters the cyclone from the top (B) Is admitted tangentially at high velocity (C) Develops a helical motion inside the chamber (D) Both (B) and (C
Last Answer : (D) Both (B) and (C
Description : Which of the following is a batch sedimentation equipment? (A) Dust catcher (B) Filter thickener (C) Dry cyclone separator (D) Rotary sprayer scrubber
Last Answer : (B) Filter thickener
Description : The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the (A) Venturi atomiser (B) Gravity settling chamber (C) Electro-static precipitator (D) Cyclone separator
Last Answer : (C) Electro-static precipitator
Description : Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an (A) Air filter (B) Bag filter (C) Venturi scrubber (D) Hydrocyclones
Last Answer : (A) Air filter
Description : Moisture can be removed from lubricating oil using (A) Tubular centrifuge (B) Clarifier (C) Sparkler filter (D) Vacuum leaf filter
Last Answer : (A) Tubular centrifuge
Description : Operating principle of cyclone separator is based on the action of __________ dust particles. (A) Diffusion of (B) Centrifugal force on (C) Gravitational force on (D) Electrostatic force on
Last Answer : (B) Centrifugal force on
Description : Dust collection efficiency of a cyclone separator depends upon its (A) Diameter (B) Inlet gas velocity (C) Overall height (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Which of the following does not discharge the dust collected as a dry solid? (A) Electrostatic precipitator (B) Wet scrubber (C) Bag filter (D) Gravity settling chamber
Last Answer : (B) Wet scrubber
Description : Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a (A) Disc bowl centrifuge (B) Sharpies super-centrifuge (C) Batch basket centrifuge
Last Answer : (A) Disc bowl centrifuge
Description : Close circuit grinding by a ball mill with air sweeping employs a (A) Classifier (B) Cyclone separator between mill & classifier (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Traces of liquid tar fog present in coke oven gas is separated using (A) Electrostatic precipitator (B) Cyclone separator (C) Strainer (D) None of these
Last Answer : (A) Electrostatic precipitato
Description : __________ Centrifuge is normally used in sugar mills. (A) Tubular bowl (B) Disc-bowl (C) Suspended batch basket (D) Perforated horizontal basket continuous
Last Answer : (C) Suspended batch basket
Description : __________ centrifuge is the most suitable for separation of non-friable crystals. (A) Tubular bowl (B) Disc-bowl (C) Perforated horizontal basket continuous (D) Suspended batch baske
Last Answer : (C) Perforated horizontal basket continuous
Description : Traces of tar fog present in the coke oven gas is removed by (A) Cyclone separator (B) Wet packed scrubber (C) Electrostatic precipitator (D) Washing with monoethanolamine
Description : Hydro-cyclone is a (A) Crusher (B) wet classifier (C) Dry classifier (D) Magnetic separator
Last Answer : (B) wet classifier
Description : The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size). (A) c/s (B) s/c (C) s . c (D) 1/s . c
Last Answer : (A) c/s
Description : Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler? (A) Multicyclones (B) Bag filter (C) Wet scrubber (D) Hydrocyclones
Last Answer : (B) Bag filter
Description : In large thermal power stations very fine particulates present in flue gas are removed by (A) Wet scrubber (B) Bag filter (C) Electrostatic precipitators (D) Dust catcher
Last Answer : (C) Electrostatic precipitators
Description : Pick out the wrong statement. (A) A slight haze at the top of chimney indicates good combustion in the furnace (B) A bag filter incurs very small pressure drop and is very efficient for ... dust collection equipment for removal of submicronic dust particles present in flue gas (D) None of these
Last Answer : (B) A bag filter incurs very small pressure drop and is very efficient for removal of submicronic dust particles from flue gases at very high temperature
Description : Write short note on i. Cyclone separator. ii. Fluidized bed dryer.
Last Answer : Cyclone Separator Principle: Centrifugal force Construction1) Cyclone separator is size separation device 2) It consists of a cylindrical vessel with a conical base. 3) The upper part of ... are produced 3) High friction between practices generate electrostatic charges. Diagram:
Description : Describe the principle, construction, working and uses of cyclone separator.
Last Answer : Principle: Centrifugal force Construction- 1) Cyclone separator is size separation device 2) It consists of a cylindrical vessel with a conical base. 3) The upper part of the vessel is fitted ... the suspension of a solid in gas 2. It can be used with liquid suspension of solid
Description : Explain the construction and working of cyclone separator.
Last Answer : Construction: It consists of cylindrical vessel with a conical base. In upper part of vessel is fitted with a tangential inlet and fluid outlet. At the base it is fitted with solid outlet. ... solids are thrown out to the wall and fall to the conical base for discharge. Diagram
Description : Explain construction and working of cyclone separator with a well labelled diagram.
Description : Explain the working of cyclone separator with labelled diagram.
Last Answer : Cyclone separator: Working: Cyclone separators work much like a centrifuge, but with a continuous feed of dirty air. In a cyclone separator, dirty flue gas is fed into a chamber. The inside ... at the bottom of the container. The cleaned flue gas escapes out the top of the chamber.
Description : To remove dirt from the flowing fluid, we use a (A) Coagulant (B) Gravity settler (C) Strains (D) Clarifier
Last Answer : (C) Strains
Description : Which of the following is the most suitable for cleaning of fine coal dust (
Last Answer : (D) Froth floatation
Description : Pick out the wrong statement. (A) Recycled coarse material to the grinder by a classifier is termed as circulating load (B) Wear and tear in wet crushing is more than that in dry crushing of ... a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas
Last Answer : (C) Size enlargement (opposite of size reduction) is not a mechanical operation
Description : Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively. (A) 200°C and 5 atm (B) 1000°C and 10 atm (C) 500°C and 50 atm (D) 1000°C and 500 atm
Last Answer : (B) 1000°C and 10 atm
Description : Which of the following can be most effectively used for clarification of lube oil and printing ink? (A) Sparkler filter (B) Pre-coat filter (C) Disc-bowl centrifuge (D) Sharpies super-centrifuge
Last Answer : (D) Sharpies super-centrifuge
Description : Removal of activated carbon from glycerine is done by (A) Plate and frame filter (B) Rotary vacuum filter (C) Batch basket centrifuge (D) None of these
Last Answer : (A) Plate and frame filter
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 : Which of the following is a vacuum filter? (A) Filter press (B) Rotary disc filter (C) Batch basket centrifuge (D) Tank filter (Nutsche filter)
Last Answer : (B) Rotary disc filter
Description : Which hot dust-laden wind is blowing from Sahara desert to Mediterranean region? -Do You Know?
Last Answer : answer:
Description : Which hot dust-laden wind is blowing from Sahara desert to Mediterranean region?
Last Answer : Sirocco
Description : The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by (A) Biological oxygen pond (B) Aerated lagoons (C) Trickling filters (D) Gravity separator having oil skimming devices
Last Answer : (D) Gravity separator having oil skimming devices
Description : Which of the following is not used as filter aid? (A) Asbestos (B) Diatomaceous earth (C) Purified wood cellulose (D) Rice husk
Last Answer : (D) Rice husk
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 : The haemodialyzer has semi-permeable lining of tubes which help to: (a) To maintain osmotic pressure of blood. (b) To filter nitrogenous wastes from the dialyzing solution. (c) In passing the waste product, in the dialyzing solution. (d) To pump purified blood back into the body of the patient.
Last Answer : (c) In passing the waste product, in the dialyzing solution.
Description : Separation of isotopes is generally done using a/an __________ centrifuge. (A) Ultra (B) Disk-bowl (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (A) Ultra
Description : Which of the following is the most suitable for extraction in a system having very low density difference? (A) Mixer-settler extractor (B) Centrifugal extractor (C) Pulsed extractor (D) Packed extraction tower
Last Answer : (B) Centrifugal extractor
Description : Radioactive nuclear waste is treated in (A) Mixer-settler extractor (B) Rotating-disc contactor (C) Pulsed column extractor (D) Bollman extractor
Last Answer : (C) Pulsed column extractor
Description : The equipment used in the extraction of highly corrosive radioactive liquids is (A) Pulse column (B) Spray column (C) Mixer settler (D) Baffle tower
Last Answer : (A) Pulse column
Description : A coalescer in a mixer-settler liquid-liquid extraction column (A) Comprises of thin bed of substances of extended surface having high porosity (B) Helps in increasing the bubble size entering the settler ... increasing the settling rate of the bubbles (D) All 'a', 'b', & 'c'
Last Answer : (D) All 'a', 'b', & 'c'
Description : __________ extractor is used for the concentration of radioactive nuclear waste. (A) Pulsed column (B) Sieve plate (C) Mixer-settler (D) Bollman
Last Answer : (A) Pulsed column
Description : A simple way to assess tubular function is to withhold food and water for 12 hours and, then, measure (A) Serum urea (B) Serum creatinine (C) Urine output in one hour (D) Specific gravity of urine
Last Answer : Answer : D
Description : Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent? (A) Cooling and dehumidification ... (C) Dehumidification with dry bulb temperature remaining constant (D) None of these
Last Answer : (B) Heating and dehumidification at almost constant wet bulb temperature