chemical engineering MCQs – Page 278

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 Review each marked answer and report any item that may be outdated or unclear.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

5541. High pressure coal gasification is employed in ________________ process?
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A. Lurgi

B. None of these

C. Winkler

D. Kopper-Totzek

5542. In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________?
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A. All A., B. and C.

B. Free carbon in tar is more

C. Ammonia yield is more

D. Aliphatic tar is produced

5543. Compound coke ovens are those which can be heated by __________________?
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A. Both steam and electrical power

B. Lean gas (e.g., B.F. gas)

C. Rich gas (e.g., coke oven gas)

D. Both B. and C.

5544. The catalyst used in shift converter is _____________________?
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A. Vanadium

B. Silica gel

C. Alumina

D. Nickel

5545. Junkers calorimeter is used to determine the calorific value of______________________?
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A. Gaseous fuels

B. Fuel oil

C. None of these

D. Pulverised coal

5546. Gobar gas constitutes mainly of___________________?
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A. CH4 & N2

B. CO & CO2

C. CO & N2

D. CH4 & CO2

5547. The main advantage of forced draft over natural draft is that____________________?
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A. All A., B. & C.

B. Smaller height chimney can be used

C. Combustion of fuel is complete

D. Furnace control is easier

5548. In low temperature carbonisation of coal, the________________?
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A. Temperature maintained is 700C

B. Volatile matter in coke is zero

C. Yield of coke oven gas is 290 Nm3 /ton dry coal

D. Yield of tar is about 3% of dry coal

5549. Gobar gas is produced by the ______________ of cow dung?
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A. Oxidation

B. Hydrogenation

C. None of these

D. Fermentation

5550. About _____________ Nm3 of air will be required for the complete combustion of 2Nm3 of CO?
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A. 3

B. 5

C. 2

D. 4

5551. Short/intense flame is produced during combustion of gaseous fuel by using________________?
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A. Preheated secondary air

B. Very little excess air

C. High amount/current of combustion air

D. Low amount/current of combustion air

5552. Which of the following is not a manufactured fuel ?
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A. Colloidal fuels

B. Coal briquettes

C. Tar

D. LPG

5553. Ammonia content in raw coke oven gas is about _____________ gm/Nm3?
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A. 5

B. 1

C. 100

D. 50

5554. Deficiency of combustion air during combustion of a gaseous fuel_____________________?
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A. Lengthens the flame

B. Causes heat loss of fuel by its partial combustion

C. Both A. & B.

D. Shortens the flame

5555. Which of the following is not used as a binder in coal briquetting ?
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A. Pitch

B. Tar

C. Molasses

D. Line

5556. Pick out the wrong statement ?
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A. Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H

B. Angle of repose of coal increases with its increasing size

C. Specific gravity of coal increases with its increasing maturity

D. Refractive index and reflectance of coal increases with the increasing rank of coal

E. io of coal</strong>

5557. Use of pulverised coal in boiler furnace provides___________________?
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A. Smokeless burning

B. High calorific value

C. Better combustion

D. Less erosion on furnace walls

5558. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about _____________ C?
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A. 1400-1500

B. 900-1000

C. 400-500

D. 1700-1800

5559. Coking coals are invariably____________________?
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A. Lignites

B. Semi-anthracites

C. Bituminous coals

D. Anthracites

5560. Actual flame temperature is always lower than the adiabatic flame temperature, because there is________________?
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A. No possibility of obtaining complete combustion at high temperature

B. Always loss of heat from the flame

C. Both A. and B.

D. Neither A. nor B.

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