Determination of phosphorous content of iron & steel is done by bringing phosphorous into solution and then finding it by the . . . . . . . . method.
A. combustion
B. gravimetric
C. volumetric
D. both B and C
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Temperature used in the determination of volatile matter of coal is . . . . . . . . °C.
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During volatile matter content determination, air dried coal sample is heated for 7 minutes at a constant temperature of . . . . . . . . °C.
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For hydrogen analysis in blast furnace, gas by Orsat apparatus, it is completely oxidised in contact with CuO to H2 O at a-temperature of about . . . . . . . . °C.
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Cuprous chloride solution is used in orsat apparatus for selectively absorbing carbon monoxide. However, it is capable of absorbing . . . . . . . . also.
A. O2
B. CO2
C. C2 H4
D. all A, B and C
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Ammonia present in coke oven gas is determined by passing its measured volume through the standard solution of
A. sulphuric acid and then titrating it with alkali
B. hydrochloric add and then weighing the precipitate
C. nitric acid and then weighing the precipitate
D. none of these
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During dissolution of iron from iron ore in acid solution, the rate of dissolution is accelerated by the addition of little amount of . . . . . . . . which reduces ferric iron to ferrous state.
A. BaCl2
B. CaCl2
C. SnCl2
D. NaCl
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For moisture determination during proximate analysis of coal, -72 mesh coal (2 - 10 gms) is heated between 105 to 110°C
A. for 30 minutes
B. for one hour
C. till constant weight is achieved
D. either B or C
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Determination of volatile matter in coal, during its proxiinate analysis requires heating of coal sample.
A. weighing 25 gins (as received basis) in a muffle furnace
B. in a platinum crucible
C. weighing 1 gms (air dried)
D. in a fuel oil fired furnace
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Calorific value of fuel gases is not determined by the . . . . . . . . calorimeter,
A. bomb
B. Boy's
C. Junker's
D. none of these
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Calorific value of liquid fuels can be determined by calorimeter.
A. Boy's
B. Junker's
C. bomb
D. none of these
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Fixed carbon of coal during its proximate analysis is determined by
A. Eschka process
B. Kjeldahl process
C. complete combustion of coal in oxygen
D. substracting the sum of percentages of volatile matter and ash of dry coal from 100
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For determination of ash in coke
A. few drops of benzene is added to avoid the oxidation of coal
B. temperature maintained is same as that for coal i.e. 775 ± 25°C
C. muffle furnace is not used
D. temperature maintained is 1050°C
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Samples for the analysis of solid metallic scrap & alloys are normally taken by
A. grinding
B. drilling
C. cutting
D. coning and quartering
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For complete analysis of iron ore, the size of the dried sample should be
A. (about 100 microns)
B. 200 mesh (about 74 microns)
C. 3 mm
D. -10 mm
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Conradson method arid Ramsbottom method is used for the determination of . . . . . . . . of the fuel oil.
A. sediment content
B. carbon residue
C. ash content
D. flash point
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Strohlein apparatus is used for the deter mination of the . . . . . . . . in ferrous materials e.g., iron or steel.
A. graphitic carbon
B. total carbon
C. sulphur
D. both B and C
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Carrier agent used in gas analysis by chromatagraph for carrying of gas sample in adsorption coloumn is generally
A. acetylene
B. helium
C. nitrogen
D. either B or C
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Fuel gas and flue gas samples are most conveniently collected in a
A. test tube
B. football bladder
C. glass tube
D. plastic bottle
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Qualitative determination of H2 S in gases is done by wetting a filter paper with . . . . . . . . and keeping it in the gas stream. The extent of brown or black colouration of the filter paper givesa rough estimate of H2 S present in the gas.
A. lead acetate
B. methyl orange
C. phenolphthalein
D. ammonium hydroxide
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