Description : Work index is defined as the (A) Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen (B) Energy needed to crush ... of the product passes a 200 mesh screen (D) Energy needed to crush one ton of feed to 100 microns
Last Answer : (A) Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
Description : Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns. (A) < 5 (B) 10 to 25 (C) < 74 (D) > 1000
Last Answer : (C) < 74
Description : or Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns. (A) 5 (B) 50 (C) 500 (D) 5000
Last Answer : (C) 500
Description : Pick out the wrong statement. (A) Hammer crushers operate by impact action (B) Standard screens have circular opening (C) With increase in mesh number of screens, their diameter in microns decreases (D) 200 mesh screen has 200 openings per linear cm
Last Answer : (D) 200 mesh screen has 200 openings per linear cm
Description : Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm. (A) 0.007 (B) 0.30 (C) 50 (D) 0.014
Last Answer : (B) 0.30
Description : Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid. (A) 2 to 3 (B) 0.01 to 0.10 (C) 200 to 300 (D) 100 to 1000
Last Answer : A) 2 to 3
Description : The opening of a 200 mesh screen (Taylor series) is (A) 0.0074 cm (B) 0.0074 mm (C) 0.0047 cm (D) 74 milli-micron
Last Answer : (A) 0.0074 cm
Description : For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns). (A) 1-5 (B) 10-60 (C) 200-300
Last Answer : (B) 10-60
Description : Bucket elevators are not suitable for the vertical lifting of __________ materials. (A) Fine (e.g. - 200 mesh size coal) (B) Sticky (e.g. clay paste) (C) Small lumpy (e.g. grains and sand) (D) Free flowing
Last Answer : (B) Sticky (e.g. clay paste
Description : Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C. (A) 80-120 (B) 200-300 (C) 600-800 (D) 1000-1100
Last Answer : (D) 1000-1100
Description : Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately? (A) Rittinger's law (B) Kick's law (C) Bond's law (D) None of these
Last Answer : (A) Rittinger's law
Description : Pick out the correct statement. (A) Plastic chips are called non-cohesive solids (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b ) (C) Communition is a generic term for size enlargement ... per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'
Last Answer : (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b )
Description : The most suitable equipment for the transportation of 200 mesh size particles is a (A) Bucket elevator (B) Pneumatic conveyor (C) Screw conveyor (D) Belt conveyor
Last Answer : (B) Pneumatic conveyor
Description : Coal is finally pulverised to 200 mesh size for burning in boilers by a (A) Hammer crusher (B) Ball mill (C) Roll crusher (D) Gyratory crusher
Last Answer : (B) Ball mill
Description : Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for (A) British ... (C) American standard screens (ASTM and Tyler standard screens) (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : 80% less than 200 mesh size particles are called (A) Smoke (B) Powder (C) Grit (D) Aggregates
Last Answer : (B) Powder
Description : Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation. (A) Clarification (B) Sedimentation (C) Flocculation (D) Classification
Last Answer : (D) Classification
Description : Electro-magnetic spectrum range, which is important for radiation varies from __________ microns. (A) 1 to 100 (B) 0.5 to 50 (C) 10 to 100 (D) 100 to 1000
Last Answer : (B) 0.5 to 50
Description : The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns. (A) 0.38-0.78 (B) 0.5-50 (C) 100-1000 (D) 5-50
Last Answer : (B) 0.5-50
Description : Pore size of the molecular sieve 5A is __________ mm. (A) 5 (B) 0.5 (C) 0.05 (D) 50
Last Answer : (B) 0.5
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) *
Description : Vibrating screens have capacity in the range of __________ tons/ft 2 .mm mesh size. (A) 0.2 to 0.8 (B) 5 to 25 (C) 50 to 100 (D) 100 to 250
Last Answer : (A) 0.2 to 0.8
Description : A horse is tied to a peg hammered at one of the corner of a rectangular grass field of 40 m by 24 m by a rope 14 m long. Over how much area of the field can the horse graze? (1) 154 m2 (2) 308 m2 (3) 240 m2 (4) 480 m2
Last Answer : (1) 154 m2
Description : 200 mesh screen means 200 openings per (A) cm2 (B) cm (C) inch (D) inch
Last Answer : (C) inch
Description : Very low pressure is expressed in microns (μ), which is equal to__________ mm of Hg column (absolute) at 0°C. (A) 0.0001 (B) 0.001 (C) 0.01 (D) 0.1
Last Answer : (B) 0.001
Description : A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20microns settling in the same oil will have a settling velocity (A) ... ) One fourth as that of A (C) Twice as that of A (D) Four times as that of A
Last Answer : (B) One fourth as that of A
Description : After the final grinding, the cement is sieved through IS sieve number (a) 9 (b) 12 (c) 24 (d) 48
Last Answer : (a) 9
Description : The equation, Nst = (f/2)/[1 + 5 (Npr - 1) √(f/2)], corresponds to __________ analogy. (A) Von-Karman (B) Reynolds (C) Colburn (D) Prandtl
Last Answer : (D) Prandtl
Description : Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels. (A) 75 (B) 95 (C) 120 (D) 140
Last Answer : (B) 95
Description : Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels. (A) 90 (B) 120 (C) 150 (D) 180
Last Answer : (B) 120
Description : Shouting by a man at his full voice corresponds to a voice level of about __________ decibels. (A) 25 (B) 50 (C) 80 (D) 120
Last Answer : (C) 80
Description : Ringelmann chart No. 2 corresponds to __________ percent black smoke. (A) 10 (B) 20 (C) 40 (D) 80
Last Answer : (C) 40
Description : Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels. (A) 105 (B) 135 (C) 160 (D) 185
Last Answer : (B) 135
Description : The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction. (A) Elementary (B) Non-elementary (C) Parallel (D) Autokinetic
Last Answer : (A) Elementary
Description : The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm. (A) 0.001 (B) 0.01 (C) 0.002 (D) 0.02
Last Answer : Option C
Description : Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m2 of steel strip. (A) 5-10 (B) 1000-1500 (C) 120-500 (D) 1500-3000
Description : Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant. (A) Agitated vessel (B) Sieve tray column (C) Bubble cap column (D) Packed tower
Last Answer : (A) Agitated vessel
Description : __________ columns are used for liquid dispersion in a continuous gas phase. (A) Packed (B) Pulse (C) Bubble cap (D) Sieve plate
Last Answer : (A) Packed
Description : __________ column is used in gas absorption process. (A) Wetted wall (B) Sieve/perforated tray (C) Bubble cap (D) Packed
Last Answer : (D) Packed
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 : If a perimeter is 74 yards and lts lenght 24 feet. what is the width?
Last Answer : What is the answer ?
Description : What is the shear stress acting on the outer surface of a hollow shaft subjected to a torque of 100 Nm?(The inner and outer diameter of the shaft is 15 mm and 30 mm respectively.) a. 50.26 N/mm2 b. 40.24 N/mm2 c. 20.120 N/mm2 d. 8.74 N/mm2
Last Answer : c. 20.120 N/mm2
Description : Harish buys petrol at rs 21, Rs.24 and Rs.27 per litre for 3 successive years. What approximately is the average cost per litre of petrol if he spends Rs.12000 each year? A) 23.74 B) 54.76 C) 24.66 D) 28.99
Last Answer : A) Total quantity of petrol consumed in 3 yr = (12000/21 +12000/24+12000/27) =12000(1/2 + 1/24 + 1/27) =12000(72+63+56/1512) =12000(191/1512) =(2292000/1512)litres Total amount spent = rs(3 *12000) = Rs.36000 Average cost = Rs(36000*1512/2292000) =Rs.23.74
Description : How many microns in 70 GSM?
Last Answer : Need answer
Description : What is the name of the electromagnetic radiation in the range of 0.4 to 0.7 microns?
Last Answer : ANSWER: VISIBLE LIGHT
Description : Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the ... Dry chemicals (C) Heavy tonnages of rocks or gravel (D) Powdered food & granular materials
Last Answer : (C) Heavy tonnages of rocks or gravel
Description : Pick out the wrong statement. (A) Nitrogen is normally supplied in fertiliser either in Ammoniacal or the nitrate form, from which the soil takes it up in the form of ammonium ions ornitrate ... nitrate fertiliser is obtained as a by-product in an integrated steel plant having by-product coke ovens
Last Answer : (D) Ammonium nitrate fertiliser is obtained as a by-product in an integrated steel plant having by-product coke ovens
Description : If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than (A) 20.5 mm (B) 30.5 mm (C) 40.5 mm (D) 50.5 mm
Last Answer : Answer: Option C
Description : Draw particle size distribution curve. Explain mechanical sieve analysis for grading of soil with a sketch.
Last Answer : Mechanical sieve analysis -The process of analyzing the particle size present in soil by using mechanical means, is known as mechanical sieve Analysis. By performing mechanical sieve analysis, a particle size ... c) Fine grained soil d) Coarse grained soil e) Uniformly graded soil
Description : The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr. (A) 100 (B) 200 (C) 1000 (D) 2000
Last Answer : (B) 200