chemical engineering MCQs – Page 293

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 Review each marked answer and report any item that may be outdated or unclear.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
5841. Firing temperature of magnesite bricks is about _____________ C?
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A. 800-1000

B. 2400-2600

C. 1600-1800

D. 1000-1200

5842. Coking time in narrow by-product coke ovens is around ______________ hours?
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A. 80

B. 8

C. 48

D. 18
5843. Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?
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A. 500

B. 750

C. 160

D. 60

5844. Calorific value as determined by bomb calorimeter is the__________________?
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A. Lower calorific value at constant pressure

B. Net calorific value at constant volume

C. Higher calorific value at constant volume

D. Gross calorific value at constant pressure

5845. Ash content in the coke produced from a coking coal having 20% ash may be around _____________ percent?
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A. 18

B. 6

C. 24

D. 12

5846. A particular coal is said to be free burning when it __________________?
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A. Shows little or no fusing action

B. Gives smokeless burning

C. None of these

D. Burns completely

5847. Calorific value of dry wood may be around ______________ Kcal/kg?
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A. 50

B. 5

C. 500

D. 5000

5848. Spinel, a refractory mineral is chemically represented as____________________?
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A. MgAl2O3.2H2O

B. MgAl2O4

C. MgAl2O3

D. MgSO4

5849. With increase in the density of silica refractories, its_______________?
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A. Resistance to slag attack increases

B. Spalling resistance reduces

C. Both A. and B.

D. Neither A. nor B.

5850. With increase in the porosity, thermal spalling resistance of fireclay brick___________________?
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A. May increase or decrease

B. Decreases

C. Increases

D. Remain same

5851. Roof of a basic open hearth furnace is lined with ______________ bricks?
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A. Magnesite

B. Fireclay

C. Dolomite

D. Silica
5852. Refractoriness of a typical silica brick corresponds to Segar cone number, 32, which is equivalent to a temperature of _____________ C?
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A. 1520

B. 1380

C. 1710

D. 1915

5853. Which of the following is a measure of the agglutinating (i.e., binding) property of coal ?
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A. Thickness of plastic layer

B. Caking index

C. Swelling index

D. Gray-king index

5854. In flue gas analysis by Orsats apparatus, oxygen is absorbed by____________________?
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A. Cuprous chloride

B. None of these

C. Alkaline pyrogallol solution

D. Potassium hydroxide

5855. Maximum alumina content in high alumina refractory can be as high as _____________ percent?
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A. 70

B. 50

C. 30

D. 90
5856. Ultimate analysis of coal determines its _______________ content?
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A. Carbon, volatile matter, ash & moisture

B. Carbon, sulphur, volatile matter & ash

C. Carbon, hydrogen, nitrogen & sulphur

D. Carbon, ash, sulphur & nitrogen

5857. A coal containing very high percentage of durain is called ______________ coal?
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A. Boghead

B. Non-banded

C. Bright

D. Splint
5858. Higher percentage of ash in coal meant for the production of metallurgical grade coke ___________________?
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A. None of these

B. Decreases the abrasion resistance of coke

C. Causes brittleness in steel

D. Decreases the hardness of coke

5859. Silicon carbide refractories have very low ___________________?
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A. Thermal conductivity

B. Refractoriness (< 1700C)

C. Resistance to thermal shock

D. None of these
5860. High alumina refractories are used in the ___________________?
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A. Electric arc furnace roof

B. Dome of blast furnace stoves

C. Glass melting furnaces

D. All A., B. and C.