chemical engineering MCQs – Page 298

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 Review each marked answer and report any item that may be outdated or unclear.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
5941. Naphthalene recovered from coke oven gas is used___________________?
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A. As moisture proof coating on fibres

B. As moth balls (insecticides)

C. As a fuel in furnaces

D. For making electrodes

5942. Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction ?
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A. C + H2O ? CO + H2

B. CO + H2O ? CO2 + H2

C. C + 2H2O ? CO2 + 2H2

D. 2CO ? C + CO2
5943. RUL of refractories depends on the _____________________?
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A. Physical structure

B. Presence of impurities like iron & alkali

C. Chemical composition

D. All A., B. and C.
5944. The linear thermal expansion of _______________ bricks upto 1000 C is very low of the order of ? 0.5 percent?
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A. Silica

B. Magnesite

C. Fireclay

D. Corundum

5945. Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about ______________ C?
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A. 180

B. 30

C. 65

D. 120

5946. Insulating refractories should have_______________?
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A. High porosity

B. Low thermal conductivity

C. Both A. and B.

D. Neither A. not B.

5947. Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?
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A. Ammonium nitrate

B. Ammonium sulphate

C. Ammonium phosphate

D. None of these

5948. Calorific value of both the solid & liquid fuels can be determined by using ______________ calorimeter?
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A. Junkers

B. Boys

C. None of these

D. Bomb
5949. The most matured coal out of the following is__________________?
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A. Lignite

B. Bituminous

C. Semi-anthracite

D. Sub-bituminous

5950. Washing of coal________________?
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A. Reduces its sulphur and ash content

B. All A., B. and C.

C. Improves its coking properties

D. Controls its ash fusibility and increases its calorific value

5951. Si percentage in silica refractories used in the walls of coke oven is about______________________?
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A. 95

B. 45

C. 60

D. 80

5952. High temperature carbonisation of coal takes place at _______________ C?
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A. 1600

B. 2000

C. 600

D. 1100
5953. Machine moulding of dry mixture of refractories requires a pressure of the order of _____________ kg/cm2?
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A. 10

B. 100

C. 500

D. 1000
5954. Grindability index of a coal is 100. It implies that the ___________________?
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A. Coal cant be pulverised

B. Coal can be pulverised with great difficulty

C. Coal can be easily pulverised

D. Power consumption in grinding the coal will be very high

5955. Electrical resistor bars are made of _______________?
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A. Silicon carbide

B. Graphite

C. Zirconia

D. Alumina

5956. Combustion of pulverised coal as compared to that of lump coal ________________?
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A. Provides a lower rate of heat release

B. Develops a low temperature flame

C. Develops a non-luminous flame

D. Can be done with less excess air
5957. Low temperature carbonisation of coal produces_________________?
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A. Soft coke

B. No by-products

C. Metallurgical coke

D. Very low calorific value coke oven gas

5958. High ash coals ____________________?
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A. Require longer time of carbonisation as ash offers resistance to heat transfer

B. None of these

C. Produce larger quantity of coke oven gas

D. Are soft & friable (poor strength and size stability)

5959. Chrome magnesite brick is not used for lining the___________________?
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A. Bottom hearth of reheating furnace

B. Burning zone of limestone rotary kilns

C. Coke oven regenerator

D. Hearth of soaking pits

5960. Refractories are dried in the _______________?
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A. Tunnel kilns

B. Rotary kilns

C. Sun

D. None of these