chemical engineering MCQs – Page 297

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
5921. Low temperature oxidation of coal resulting from bad storage conditions does not decrease its______________________?
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A. Oxygen content

B. Hydrogen content

C. Caking power

D. Calorific value

5922. Coal is heated in presence of air to a temperature of about _______________ C, while determining its ash content for proximate analysis?
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A. 1100

B. 750

C. 500

D. 950

5923. Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900C ) use, except ?
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A. Thermal conductivity

B. Cost

C. Electrical conductivity

D. Fusion point

5924. With increase in calorific value of fuels, their adiabatic flame temperatures__________________?
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A. May increase or decrease; depends on the quantity of products of combustion

B. Remain unchanged

C. Increase

D. Decrease

5925. Rotary kilns meant for calcination of limestone are lined with chrome magnesite in ______________ zone?
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A. All the above

B. Cooling

C. Burning

D. Preheating

5926. Which of the following bricks has the most close values of RUL and PCE ?
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A. Silica bricks

B. Tar dolomite bricks

C. High alumina bricks

D. Fireclay bricks

5927. Washing of coal is done to reduce the_________________?
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A. Inherent impurities

B. Adhering impurities

C. Mineral matter

D. Both B. and C.
5928. Which adsorbent is used for removing sulphur compounds (S Q, H2S, RSH etc.) removal from coke oven gas in by-products recovery plant ?
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A. Bog iron (i.e., moist ferric hydroxide)

B. Diatomaceous earth

C. Basalt

D. Silica gel

5929. Which of the following is used for making the explosive TNT? ?
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A. Benzol

B. Cerosote

C. Pyridine

D. Toluene
5930. Main constituent of natural gas is ________________?
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A. C2H6

B. C3H8

C. H2

D. CH4 (upto 90%)
5931. Which of the following has the least calorific value (kcal/Nm3) ?
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A. Natural gas

B. Coke oven gas

C. Blast furnace gas

D. Sewage gas

5932. High amount of sulphur and phosphorous in coke causes ____________________ ?
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A. Brittleness of steel made by using it

B. Decrease in its calorific value

C. None of these

D. Increase in its strength

5933. Fusion point of an acidic refractory material is________________?
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A. Always more than 2500C

B. Increased by the addition of basic oxides

C. Reduced by the addition of basic oxides

D. Not affected by the addition of basic oxides

5934. Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called_________________?
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A. None of these

B. Banking

C. Back draughting

D. Under pressurising

5935. Silica refractories__________________?
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A. All A., B. and C.

B. crack when subjected to sudden change of temperature

C. Have lower thermal conductivity than fireclay bricks

D. Cannot be used in the dome of hot blast stoves

5936. A coal containing high amount of volatile matter will have__________________?
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A. Very little ash content

B. Low ignition temperature

C. Low adiabatic flame temperature

D. High fusion point of its ash

5937. Chrome magnesite bricks are used in the_________________?
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A. All A., B. and C.

B. Copper melting furnaces & converters

C. Side walls of soaking pits and arc furnaces

D. Burner block of glass tanks

5938. Mineral matter content (M) and ash content A. in coal are approximately related as _______________?
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A. M = 1.1A

B. M = A

C. M = 1.5A

D. M = 2A

5939. Carbon bricks are not used in the lining of the_________________?
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A. Combustion chamber of blast furnace stoves

B. Electric furnaces

C. Blast furnace hearth

D. Highly chemical resistant equipments

5940. Safe condition for storage of high V.M. bituminous coal is that ___________________?
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A. Height of the coal heap should be < 3 metres

B. Maximum 200 tons should be stored in a heap

C. Both A. and B.

D. Neither A. nor B.