chemical engineering MCQs – Page 280

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 Review each marked answer and report any item that may be outdated or unclear.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
5581. Calorific value of furnace oil is about _______________ Kcal/kg?
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A. 20,000

B. 5,000

C. 10,000

D. 15,000

5582. Initial pressure of oxygen introduced into the bomb of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around _____________ atm?
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A. 60-65

B. 25-30

C. 95-100

D. 5-Mar

5583. Use of preheated air for combustion of fuel in the furnace, increases the___________________?
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A. Scale losses of the furnace stock

B. Flame temperature

C. Calorific value of the fuel

D. None of these

5584. Fixed carbon in coal is defined as______________________?
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A. Hundred minus the percentage of volatile matter, ash and moisture

B. The one which is present in the residue after combustion

C. That present in volatile matters

D. The total quantity of carbon present in the coal

5585. Softening temperature of coal ash is a measure of the _____________ of coal?
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A. Clinkering tendency

B. Size stability

C. Caking tendency

D. Coking tendency

5586. Narrow coke ovens as compared to wider coke ovens_________________?
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A. Require less time of carbonisation

B. All A., B. and C.

C. Produce stronger coke

D. Produce smaller coke

5587. The calorific value of L.D. converter gas is about ____________ Kcal/Nm3?
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A. 800

B. 1800

C. 4500

D. 10000

5588. During combustion of coal on grate, clinker formation is increased by the___________________?
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A. All A., B. & C.

B. Low fusion point of ash (< 1100 C)

C. Use of thick fire bed

D. Use of preheated primary air

5589. Calorific value of wood gas is about ______________ kcal/Nm3?
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A. 3300

B. 1500

C. 8500

D. 5400

5590. Hardgrove Grindability index of four coal samples are given below. Which of them is the easiest to grind ?
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A. 70

B. 50

C. 100

D. 85

5591. Yield of pitch from distillation of high temperature tar is around _____________ percent?
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A. 65

B. 25

C. 10

D. 90

5592. The internal energy of the combustion products is ____________________ compared to that of reactants?
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A. More or less; (depends on the state of fuel.)

B. More

C. Less

D. Equal

5593. Blast furnace gas is a very poisonous gas because of its predominantly high _______________ content?
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A. H2O

B. CH4

C. CO2

D. CO
5594. Light oil whose major component is Benzol, is obtained by the distillation of crude tar in the temperature range of _____________ C?
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A. 80-170

B. 280-300

C. 200-300

D. 250-270

5595. Blast furnace gas constitutes mainly of_________________?
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A. N2 & CH4

B. N2 & CO

C. CH4 & CO2

D. N2 & H2

5596. Coke having higher porosity has ___________________?
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A. All A., B. and C.

B. Higher reactivity

C. Lower strength

D. Lower bulk density

5597. Coking time in beehive coke oven is about ___________________?
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A. One week

B. 12 hours

C. Two weeks

D. 2-3 days
5598. The difference between total carbon and fixed carbon of coal will be minimum in case of___________________?
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A. Bituminous coal

B. Lignite

C. High temperature coke (V.M < 0.5%)

D. Anthracite

5599. Which of the following has the highest heat of combustion ?
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A. CO

B. C2H6

C. CH4

D. H2

5600. Volumetric ratio of N2 to O2 in dry atmospheric air is ______________?
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A. 0.21

B. 0.79

C. 4.76

D. 3.76