chemical engineering MCQs – Page 296

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 Review each marked answer and report any item that may be outdated or unclear.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
5901. If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as___________________?
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A. CO

B. N2

C. O2

D. SO2
5902. Sometimes water is sprayed during coal charging in the coke oven, which helps in ________________?
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A. Controlling the dust nuisance while charging the coal

B. in the gas (due to the endothermic reaction represented by C + H2O = CO + H2)

C. All A., B. and C.

D. Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO &

E. Prevention of clinker formation in the oven

5903. Mixing of ground refractory material and water is done in a ______________ mill?
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A. Pug

B. Ball

C. Tube

D. Rod

5904. Hard coke is manufactured from___________________?
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A. Semi-anthracite

B. Anthracite

C. Lignite

D. Bituminous coal
5905. Which of the following gaseous fuels has the lowest calorific value ?
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A. Blast furnace gas

B. Converter gas

C. Refinery gas

D. Gobar gas

5906. Which of the following is not applicable to fluidised bed combustion of coal ?
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A. It achieves higher fuel combustion efficiency

B. None of these

C. It cannot burn low grade coal

D. Less heat transfer surface area is required in boilers

5907. Flue gas from the heating chamber of by product coke ovens is removed by________________?
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A. Steam ejector

B. Forced draft fan

C. Natural draft

D. Induced draft fan

5908. Ignition temperature decreases progressively from anthracite to lignite, because___________________?
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A. Volatile matter content increases

B. Ash content increases

C. Carbon content decreases

D. Moisture content increases

5909. Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?
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A. Carborundum

B. Graphite

C. Chromite

D. Fireclay

5910. Anthracite coal ____________________?
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A. Contains more volatile matter than bituminous coal

B. Is essentially a coking coal

C. Burns with short, bluish, yellow-tipped flame producing very little smoke

D. Ignites more easily than bituminous coal

5911. Graphite or carbon refractories______________________?
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A. Should be used in neutral or reducing atmosphere

B. Exhibit wetting characteristics

C. Are not resistant to corrosion by slag

D. Exhibit high shrinkage on thermal treatment

5912. The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called ?
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A. Burning temperature

B. Smoke point

C. Kindling temperature

D. Fire point

5913. Which is the stable form of silica below 870C ?
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A. Cristobalite

B. None of these

C. Tridymite

D. Quartz
5914. Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around ______________ cm/hr?
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A. 10

B. 0.5

C. 20

D. 2.5
5915. Which of the following constituents of coal is the most important in the production of coke ?
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A. Moisture

B. Ash

C. Volatiles

D. Carbon
5916. Which of the following is a rich fuel gas ?
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A. Coal gas from underground gasification of coal

B. None of these

C. Producer gas

D. Refinery gases
5917. Incomplete combustion of fuel in the furnace is judged by high _____________ of the flue gases?
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A. CO content

B. O2 content

C. CO2 content

D. Dew point

5918. (64-132) rank coal (ASTM) means a coal with 64%___________________?
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A. Fixed carbon and a heating value of 132 BTU/1b

B. None of these

C. Ash and a heating value of 13, 200 BTU/1b

D. Fixed carbon and having a heat value of 13, 200 BTU/1b
5919. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?
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A. 10

B. 15

C. 20

D. 30
5920. Basic bricks are not made of ___________________?
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A. Magnesite

B. Chromite

C. Forsterite

D. Fireclay