chemical engineering MCQs – Page 277

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 Review each marked answer and report any item that may be outdated or unclear.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
5521. Tolerable concentration of toxic carbon monoxide in atmospheric air is about ______________ ppm?
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A. 1000

B. 5000

C. 10000

D. 50
5522. Out of the following fuels, the difference between the net and gross calorific value is maximum in case of_________________?
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A. Blast furnace gas

B. Fuel oil

C. Bituminous coal

D. Pitch

5523. Adiabatic flame temperature of a fuel is dependent on the initial temperature of___________________?
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A. Fuel

B. Air

C. Both A. & B.

D. Neither A. nor B.

5524. Proximate analysis of coal determines its ______________ content?
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A. Moisture, ash, sulphur & volatile matter

B. Moisture, volatile matter, ash & fixed carbon

C. None of these

D. Moisture, sulphur, nitrogen & fixed carbon

5525. The reaction, C + CO2 ? 2CO, taking place during coal gasification is called the ______________ reaction?
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A. Boudouard

B. Shift conversion

C. Reduction

D. Neumann reversal

5526. Abrasion index of blast furnace coke should be around _____________ percent?
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A. 80

B. 55

C. 20

D. 35

5527. A coal with high ash content___________________?
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A. Is not subjected to washing

B. Has low quantity of mineral matter

C. Is harder and stronger

D. Has higher calorific value

5528. Which of the following coke has the least percentage of ash ?
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A. Beehive coke

B. Foundry coke

C. Metallurgical coke

D. Petroleum coke
5529. Use of excess of combustion air in the combustion of fuels results in__________________?
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A. None of these

B. Long flame

C. Condensation of water vapour from the fuel gas

D. Heat losses
5530. Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?
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A. 6000

B. 4000

C. 1000

D. 8000

5531. Height of coke oven is limited (say maximum upto 7 metres) mainly by the_____________________?
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A. Buckling of ram of pusher car at the time of coke pushing

B. Problem of uniform heating along its height

C. Problem in door cleaning

D. Structural strength of silica bricks

5532. Which of the following fuel gases is heavier than air ?
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A. Blast furnace gas

B. Natural gas

C. Coke oven gas

D. Water gas

5533. Cannel coal__________________?
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A. Is non-coking

B. named

C. Has a high volatile matter content and burns with a luminous smoky flame

D. All A., B. and C.

E. Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is

5534. Ratio of primary air to secondary air increases with increase in the rank of coal, because the__________________?
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A. High rank coals have higher amount of volatile matter

B. Ratio of fixed carbon to volatile matter increases

C. Oxygen content progressively decreases

D. Calorific value of the coal increases

5535. During its calorific value determination by bomb calorimeter, coal is combusted by _________________?
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A. Oxygen enriched air

B. Air

C. None of these

D. Oxygen
5536. Coke oven gas is stripped of its H2S and mercaptans content by_________________?
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A. Adsorption on bog iron bed

B. Bubbling it through dilute sulphuric acid

C. Adsorption on silica gel

D. Absorption in wash oil

5537. The gasification reaction represented by, C + H2O = CO + H2, is__________________?
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A. Endothermic

B. Catalytic

C. Exothermic

D. Autocatalytic

5538. High sulphur content in a fuel ______________ of the flue gases?
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A. Decreases the dew point

B. Increases the dew point

C. Reduces the combustion efficiency by limiting the permissible temperature reduction

D. Both B. and C.
5539. Spontaneous combustion of coal on storage results due to___________________?
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A. All A., B. and C.

B. Storage in large heaps with small surface to volume ratio

C. Low temperature oxidation

D. Inadequate ventilation

5540. Caking index of coal blend used for blast furnace coke making is about_________________?
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A. 22

B. 36

C. 12

D. 8