chemical engineering MCQs – Page 285

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 Review each marked answer and report any item that may be outdated or unclear.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

5681. Purity of coke means that, it is high in carbon and low in __________________?
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A. Volatiles

B. Iron

C. Ash

D. Moisture

5682. Gross & net calorific value is the same for___________________?
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A. L.D. converter gas

B. None of these

C. Coke oven gas

D. Blast furnace gas

5683. Pulverised coal used in boiler firing need not have____________________?
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A. Less moisture content

B. High fusion point of its ash

C. High bulk density

D. Lower ash content

5684. C.V. (kcal/Nm3) of gaseous fuels _____________ with increase in molecular weight?
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A. Increases

B. May increase or decrease, depends on combustibles

C. Remain constant

D. Decreases

5685. Main constituents of Benzol are ____________________?
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A. Anthracene & phenol

B. Tar & creosote

C. Ammonia & phenol

D. Benzene, toluene & xylene

5686. Stoichiometric combustion of 12 kg of carbon requires _____________ of oxygen?
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A. All A., B. and C.

B. 32 kg

C. 1kg mole

D. 22.4 Nm3

5687. If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be_____________?
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A. Low

B. None of these

C. High

D. Very high, if the fuel is of low calorific value

5688. A coal having higher volatile matter content, has lower_________________?
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A. Coke oven gas yield on carbonisation

B. Smoking tendency on burning

C. Chance of catching fire during storage in open space

D. Ignition temperature

5689. Natural draft created by the chimney depends upon _____________________?
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A. Temperature of the flue gas

B. Its height

C. Both A. & B.

D. Neither A. nor B.

5690. Which of the following has the highest flame velocity ?
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A. CH4

B. CO

C. C2H6

D. H2

5691. When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?
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A. Oxidation

B. Coalification

C. Carbonisation

D. Gasification

5692. Flue gas discharge velocity through chimney of a big thermal power plant may be around ________________ m/sec?
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A. 50

B. 500

C. 10

D. 0.5

5693. In high temperature carbonisation of coal compared to low temperature carbonisation ?
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A. Yield of ammonia is less

B. Aromatic content of tar is low

C. H2 content in the coke oven gas is more

D. Calorific value of the coke oven gas is lower

5694. Increase in ash content of blast furnace coke_________________?
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A. Reduces its consumption in the furnace

B. Increases its consumption in the furnace

C. Decreases its hardness and abrasion resistance

D. Does not affect its consumption in the furnace

5695. The calorific value of producer gas is around _____________ kcal/Nm3?
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A. 9000

B. 1300

C. 4500

D. 500

5696. Octane number of 2, 2, 4 trimethyl pentane is __________________?
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A. 100

B. In between 0 and 100

C. More than 100

D. 0

5697. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?
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A. Erosion of induced draft fan blades

B. Excessive fly-ash discharge from the stack

C. High power consumption in its transportation

D. Ash disposal problem

5698. Volatile matter content in coking coal may be about _____________ percent?
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A. 1

B. 46

C. 7

D. 22

5699. Volatile matter content of metallurgical coke may be around ______________ percent?
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A. 15-Oct

B. 30-33

C. 1-2

D. 22-26

5700. Blast furnace gas compared to coke oven gas has_________________?
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A. Lower theoretical flame temperature

B. Higher calorific value

C. Narrower limit of inflammability

D. Lower ignition temperature

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