chemical engineering MCQs – Page 286

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 Review each marked answer and report any item that may be outdated or unclear.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

5701. Air/gas ratio for complete combustion will be the highest for__________________?
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A. LPG

B. Carburetted water gas

C. Coke oven gas

D. Gobar gas

5702. Which of the following is a poisonous fuel gas ?
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A. None of these

B. Natural gas

C. Coke oven gas

D. Blast furnace gas

5703. Oxygen percentage (by weight) in atmospheric air is_________________?
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A. 19

B. 29

C. 21

D. 23

5704. Orsat apparatus__________________?
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A. Determines N2 in flue gas indirectly

B. Cant determine CO in flue gas, if it is < 0.2%

C. Gives flue gas analysis on dry basis

D. All A., B. & C.

5705. Presence of nitrogen in combustion air does not reduce the ____________________?
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A. Any of the above

B. Flue gas temperature

C. Amount of heat liberated

D. Flame temperature

5706. Washing of coal does not reduce its______________________?
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A. S & P content

B. None of these

C. Heating value

D. Fusion point of ash

5707. During the carbonisation of coal__________________?
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A. All tar is evolved at 700C

B. Hard semi-coke starts shrinking at 600C

C. All A., B. and C.

5708. Coals used for the generation of producer gas should have ____________________?
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A. Very low ash content (8-10%)

B. Low fusion point of ash

C. High caking index

D. High volatile matter content

5709. Gross heating value of coal is ______________ the net heating value?
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A. Lower than

B. Either A. or B.; depends on the type of coal

C. Same as

D. Higher than

5710. Fossil fuels mean___________________?
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A. Premature fuels with low calorific value

B. Those fuels which are found in the crust of earth

C. Solid fuels

D. Liquid fuels

5711. The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?
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A. Calorific value

B. Ignition temperature

C. Type (solid, liquid or gaseous)

D. Sulphur content

5712. Coalification means the ___________________?
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A. Process of conversion of lignite into anthracite

B. Underground gasification of coal

C. Direct hydrogenation of coal

D. Complete combustion of coal

5713. A coal that softens and fuses on heating is_________________?
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A. Classified

B. Carbonised

C. Caking

D. Non-caking

5714. Which of the following has the highest theoretical flame temperature ?
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A. Coke oven gas

B. Hydrogen

C. Blast furnace gas

D. Acetylene

5715. Dust content in raw blast furnace gas is about _______________ gm/Nm3; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use?
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A. 150-200

B. 70-100

C. 15-30

D. 2-Jan

5716. Pick out the wrong statement ?
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A. C.V. of natural gas is about 10000 KCal/Nm3

B. L.P.G. is lighter than air

C. C.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg)

D. Main constituents of LPG are propane and butane

5717. Washing of coal _________________?
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A. Improves its coking properties

B. Reduces its ash & sulphur content

C. Increase the fusion point of its ash by removing chlorine compounds

D. All A., B. and C.

5718. Assam (India) coals suffers mainly from the disadvantage of high ______________ content?
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A. Volatile matter

B. Ash

C. Sulphur (4-6%)

D. Moisture

5719. Pick out the wrong statement ?
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A. Property of tackiness is exhibited by uncured rubber

B. Polythene generally has an excellent resistance to ultra violet rays

C. Polymeric fibres are never produced by addition polymerisation

D. Sharp melting point is not observed in thermoplastic polymers

5720. High temperature carbonisation of coal produces__________________?
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A. None of these

B. Inferior coke compared to low temperature carbonisation

C. Less of gases compared to liquid products

D. Large quantity of tar compared to low temperature carbonisation

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