chemical engineering MCQs – Page 282

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 Review each marked answer and report any item that may be outdated or unclear.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
5621. With increase in moisture content of coal, its_____________________?
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A. Clinkering tendency during combustion increases

B. Calorific value increases sometimes

C. Bulk density always decreases

D. None of these
5622. Pick out the wrong statement ?
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A. ing pulverised fuel

B. None of these

C. h pulverised fuel firing

D. Low grade coal can be used, but generally high volatile matter coals are more suitable for

E. Pulverised fuel can be completely burnt with less percentage of excess air compared to lump

F. Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible

5623. Natural draught produced by a chimney depends upon the _____________________?
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A. Density of the chimney gases

B. Height of the chimney

C. Both A. and B.

D. Neither A. nor B.

5624. Calorific value of tar is about _____________ Kcal/kg?
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A. 8800

B. 12000

C. 16000

D. 14000

5625. Power alcohol as compared to straight run gasoline has lower ________________?
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A. Calorific value

B. Viscosity

C. Specific gravity

D. Octane number

5626. KOH solution used in Orsat apparatus absorbs____________________?
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A. CO2

B. SO2

C. Both A. & B.

D. Neither A. nor B.

5627. In Orsats apparatus, ammoniacal cuprous chloride is used for selectivity absorbing________________?
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A. O2

B. CO2

C. CO

D. H2O

5628. Pensky-Marten apparatus is used for those oils, whose flash points are _____________ F?
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A. 90-110

B. > 120

C. < 90

D. < 120

5629. Pick out the wrong statement ?
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A. Adiabatic flame temperatures of actual combustions are always less than the maximum values

B. Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat

C. Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature

D. Burning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature

5630. Which of the following can be made into briquettes without the use of a binder ?
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A. Bituminous coal

B. None of these

C. Lignite

D. Anthracite coal

5631. Lignite is ___________________?
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A. A high rank coal

B. A coking coal

C. A black banded coal which burns with a non-smoky yellowish flame

D. Can be used for gasification and steam generation
5632. Which of the following is a single stage, fixed bed high pressure coal gasification process ?
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A. Kopper-Totzek process

B. Winkler process

C. None of these

D. Lurgi Process
5633. Removal of hydrogen from coke oven gas ___________________?
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A. Decreases its calorific value

B. Is not possible on commercial scale

C. Does not alter its calorific value

D. Increases its calorific value
5634. Which of the following fuel gases has the highest calorific value ?
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A. Coal bed methane (CBM)

B. Natural gas

C. Sewage gas

D. Liquefied petroleum gas (LPG)
5635. Producer gas comprises mainly of _______________________?
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A. CO2 & N2

B. CO & H2

C. CO & N2

D. CO2 & H2

5636. Gray King Assay and Swelling Index of a coal is a measure of its ____________________?
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A. Agglutinating properties

B. Abradability

C. Resistance to impact breakage

D. Swelling characteristics
5637. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around ______________ Nm3?
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A. 3,000

B. 30

C. 30,000

D. 300
5638. Coke oven gas constitutes mainly of ____________________?
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A. H2 & CO2

B. H2 & CH4

C. CH4 & CO

D. H2 & CO

5639. For maximum discharge through a chimney, its height should be___________________?
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A. More than 105.7 metres

B. Infinitely long

C. 200 meters

D. Equal to the height of the hot gas column producing draught
5640. In flue gas analysis by Orsats apparatus, carbon dioxide is absorbed by______________________?
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A. Alkaline pyrogallol solution

B. Cuprous chloride

C. Dilute potassium carbonate

D. Potassium hydroxide