Description : "Micum Index" of a coke is a measure of its (A) Reactivity (B) Porosity (C) Bulk density (D) Hardness & strength
Last Answer : (D) Hardness & strength
Description : Shatter index of the coke is a measure of its (A) Strength (B) Bulk density (C) Reactivity (D) None of these
Last Answer : (A) Strength
Description : Highly reactive coke have lower (A) Porosity (B) Coke reactivity index (CRI) (C) Critical air blast (CAB) value (D) Both (B) and (C)
Last Answer : (C) Critical air blast (CAB) value
Description : H2 is a better coolant than CO2 , due to it’s relatively (A) Lower density (B) Higher specific heat (C) Non-reactivity to uranium (D) Lower neutron capture cross-section
Last Answer : (B) Higher specific heat
Description : Critical Air Blast (CAB) value of coke is a direct measure of its (A) Reactivity (B) Hardness (C) Strength (D) None of these
Last Answer : (A) Reactivity
Description : Pick out the wrong statement. (A) Cokes of high reactivity are obtained from weakly coking coals (B) Cokes of high reactivity are obtained from strongly coking coals (C) Reactivity of coke is inversely proportional to its absolute density (D) Abrasion index of the coke is a measure of its hardness
Last Answer : (B) Cokes of high reactivity are obtained from strongly coking coals
Description : A good metallurgical coke should have very low (A) Sulphur & phosphorous content (B) Porosity (C) Fusion point of its ash (D) Hardness & strength
Last Answer : (A) Sulphur & phosphorous content
Description : A metallic alloy in general as compared to their pure metal components is (A) More corrosion resistant (B) Having higher melting point (C) Having lower hardness, reactivity and fusibility (D) Having lower electrical conductivity
Last Answer : (A) More corrosion resistant
Description : During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass. (A) Density (B) Porosity (C) Electrical resistivity (D) None of these
Last Answer : (A) Density
Description : Which of the following is inherent property of soil and it can not be change a. Soil structure b. Soil Texture c. Bulk density d. Porosity
Last Answer : b. Soil Texture
Description : Caking index of a coal is a measure of its (A) Abradability (B) Reactivity (C) Agglutinating (binding) properties (D) Porosity
Last Answer : (C) Agglutinating (binding) properties
Description : Unsaturated oils compared to saturated oils have (A) Lower melting point & higher reactivity to oxygen (B) Higher melting point & higher reactivity to oxygen (C) Lower melting point & lower reactivity to oxygen (D) Higher melting point & lower reactivity to oxygen
Last Answer : (A) Lower melting point & higher reactivity to oxygen
Description : Fats as compared to oils have (A) More unsaturated glycerides of fatty acids (B) Less unsaturated glycerides of fatty acids (C) Much higher reactivity to oxygen (D) Lower melting point
Last Answer : (B) Less unsaturated glycerides of fatty acids
Description : A coal having higher volatile matter content, has lower (A) Smoking tendency on burning (B) Coke oven gas yield on carbonisation (C) Chance of catching fire during storage in open space (D) Ignition temperature
Last Answer : (D) Ignition temperature
Description : Mott and Wheeler test is conducted on coke to find its (A) Reactivity with O2 (B) Abradability (C) Phosphorus content (D) Volatile matter content
Last Answer : (A) Reactivity with O2
Description : Branched chair polymers as compared to linear polymers have (A) Higher melting point (B) Higher tensile strength (C) Lower density (D) None of these
Last Answer : (C) Lower density
Description : A good metallurgical coke (A) Should have high porosity (B) Should be brittle (C) Must contain moderate quantities of ash, moisture, sulphur and volatile matters (D) Should have low fusion point of its ash
Last Answer : (A) Should have high porosity
Description : Pulverised coal used in boiler firing need not have (A) Less moisture content (B) High fusion point of its ash (C) High bulk density (D) Lower ash conten
Last Answer : (B) High fusion point of its ash
Description : Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has (A) Higher calorific value (B) Lower hydrogen content (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (D) Neither (A) nor (B)
Description : Blast furnace gas compared to coke oven gas has (A) Lower ignition temperature (B) Narrower limit of inflammability (C) Higher calorific value (D) Lower theoretical flame temperature
Last Answer : (D) Lower theoretical flame temperature
Description : Vulcanisation of rubber (A) Decreases its tensile strength (B) Increases its ozone & oxygen reactivity (C) Increases its oil & solvent resistance (D) Converts its plasticity into elasticity
Last Answer : (D) Converts its plasticity into elasticity
Description : A bed consists of particles of density 2000 kg/m3 . If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is (A) 25.61 kPa (B) 11.77 kPa (C) 14.86 kPa (D) 21.13 kPa
Last Answer : (B) 11.77 kPa
Description : A gas (density = 1.5 kg/m3 , viscosity = 2 10 -5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The ... flowing at 3 m/s will be (A) 8400 Pa/m (B) 12600 Pa/m (C) 18900 Pa/m (D) 16800 Pa/m
Last Answer : (B) 12600 Pa/m
Description : Helium-mercury method can be used to determine the __________ of the catalyst particle. (A) Pore volume (B) Solid density (C) Porosity (D) All (A), (B), & (C)
Last Answer : (D) All (A), (B), & (C)
Description : For manometer, a better liquid combination is one having (A) Higher surface tension (B) Lower surface tension (C) Surface tension is no criterion (D) High density and viscosity
Last Answer : Answer: Option A
Description : Pick out the correct statement. (A) A lower temperature favours the reaction of lower activation energy (B) The dispersion number for a reactor/vessel is uL/D (C) The rate controlling step in ... step (D) Pore volume and porosity of a catalyst is measured by BrunauerEmmett-Teller (BET) technique
Last Answer : (A) A lower temperature favours the reaction of lower activation energy
Description : Refractory metals are known for which of the following properties: w) lack of chemical reactivity x) low density y) high melting point z) high thermal conductivity
Last Answer : ANSWER: Y -- HIGH MELTING POINT
Description : Why do we find increased porosity, yellowish tinge and lack of tensile strength in old paper?
Last Answer : Paper contains significant amount of lignin. Exposure of lignin to air and sunlight causes old paper to turn yellowish.
Description : The higher reactivity of an alkene or alkyne, as compared to an alkane, is due to (a) sigma bonds (b) pi bonds (c) hydrogen bonds (d) None of these
Last Answer : pi bonds
Description : Which of the following statements correctly describes the general reactivity of alkynes? (a) An alkyne is an electron-rich molecule and therefore reacts as a nucleophile. (b) The σ bonds ... fail to undergo electrophilic addition reactions. (d) Alkynes are generally more reactive than alkenes.
Last Answer : Alkynes are generally more reactive than alkenes.
Description : Branched chain polymers compared to linear polymers have higher (A) Density (B) Tensile strength (C) Melting point (D) Degree of irregularity in atomic packing
Last Answer : (D) Degree of irregularity in atomic packing
Description : In arc welding, Argon is used because of its - (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value
Last Answer : (1) Low reactivity with metal Explanation: In arc welding, Argon is used as a shielding gas because it is chemically inert and forms no compounds. At the high temperatures that welding requires, the ... to brittle welds and instability in the welding arc. So,argon and other inert gases are sprayed.
Description : In arc welding, Argon is used because of its (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value
Last Answer : Low reactivity with metal
Description : If dry density, water density and specific gravity of solids of a given soil sample are 1.6 g/cc, 1.84 g/cc and 2.56 respectively, the porosity of the soil sample, is (A) 0.375 (B) 0.370 (C) 0.380 (D) 0.390
Last Answer : (A) 0.375
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 : The capacity of a pneumatic conveying system depends upon the (A) Bulk density of materials (B) Pressure of the conveying air (C) Diameter of the conveying line (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3 ) (A) 3.6 W.D.V.ρ (B) 3.6 W.D.V (C) 3.6 W.V.ρ (D) 3.6 D.V.ρ
Last Answer : (A) 3.6 W.D.V.ρ
Description : Width and speed of a conveyor belt depends upon the __________ of the material. (A) Lump size (B) Bulk density (C) Both (A) & (B) (D) Neither (A) nor (B
Last Answer : (C) Both (A) & (B)
Description : As the equilibrium moisture content of the coal increases, its (A) Calorific value increases (B) Swelling number decreases (C) Swelling number increases (D) Bulk density decreases
Last Answer : (B) Swelling number decreases
Description : With increase in moisture content of coal, its (A) Calorific value increases sometimes (B) Bulk density always decreases (C) Clinkering tendency during combustion increases (D) None of these
Last Answer : (D) None of these
Description : Bulk density of pulverised coal may be about __________ kg/m3 . (A) 100 (B) 500 (C) 1000 (D) 1500
Last Answer : (B) 500
Description : Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in (A) Low bulk density product (B) Biuret formation (C) Non-spherical prills (D) Substantially wet non-flowing and sticky product
Last Answer : (B) Biuret formation
Description : The dimensional formula of bulk modulus of elasticity is same as that of the (A) Pressure (B) Density (C) Force (D) None of these
Last Answer : Option A
Description : Beehive coke oven (A) Facilitates by-products recovery (B) Takes 2-3 days for coking of coal but requires no external fuel for heating (C) Gives larger yield of coke (around 85%) as compared to by-product ovens (D) Produces coke with very poor strength
Last Answer : (B) Takes 2-3 days for coking of coal but requires no external fuel for heating
Description : Fussain (A) Is friable, charcoal like substance (B) Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal (C) Is non-coking, but when blended with highly coking ... its swelling and produces high strength coke on carbonisation (D) All (A), (B) and (C)
Description : High amount of sulphur and phosphorous in coke causes (A) Decrease in its calorific value (B) Increase in its strength (C) Brittleness of steel made by using it (D) None of these
Last Answer : (C) Brittleness of steel made by using it
Description : High ash coals (A) Are soft & friable (poor strength and size stability) (B) Require longer time of carbonisation as ash offers resistance to heat transfer (C) Produce larger quantity of coke oven gas (D) None of these
Last Answer : (A) Are soft & friable (poor strength and size stability)
Description : Anthracite can be used for (A) Recarbonising steel (B) Making carbon electrodes (C) Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke (D) All (A), (B) and (C)
Description : High ash containing coke (A) Produces more slag when used in the blast furnace (B) Has poor strength and abrasion resistance (C) Is desirable in producer gas manufacture (D) None of these
Last Answer : (A) Produces more slag when used in the blast furnace