chemical engineering MCQs – Page 279

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 Review each marked answer and report any item that may be outdated or unclear.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
5561. Presence of phosphorous in metallurgical coal__________________?
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A. Increases its caking power

B. Badly affects the quality of steel

C. Reduces its calorific value

D. Is not undesirable

5562. Kopper-Totzek coal gasifier_________________?
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A. Is a moving bed reactor

B. Can give ammonia synthesis gas (H2 + N2)

C. Cannot use coking coal

D. Operate at very high pressure

5563. Weathering of coal during storage causes_______________?
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A. Decrease in its caking capacity

B. Increase in its friability

C. Reduction in coal size

D. All A., B. and C.
5564. Abel apparatus is used for those oils, whose flash points are ___________F?
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A. < 120

B. > 280

C. > 120

D. 300-600

5565. _____________ prohibits the use of alcohols directly in petrol engines ?
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A. High cost & availability

B. Low octane number

C. Low calorific value

D. Low flash point

5566. Which of the following has the highest calorific value ?
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A. Anthracite

B. Lignite

C. Peat

D. Sub-bituminous coal

5567. Higher fuel combustion efficiency cannot be achieved by_________________?
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A. Adopting proper fuel firing technique & fuel preparation

B. Preheating of fuel gases & combustion air

C. Reducing sulphur content in the fuel

D. Supplying correct amount of combustion air

5568. Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O) ?
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A. Low temperature coke

B. Anthracite coal

C. Blast furnace coke

D. Sub-bituminous coal

5569. Coke compared to the coal from which it has been made, contains ____________________?
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A. Less volatile matter

B. Greater percentage of ash

C. All A., B. and C.

D. More carbon

5570. Steam is intermittently admitted into the fuel bed during the production of producer gas to__________________?
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A. Convert CO to CO2

B. Minimise the chances of clinker formation

C. Increase the combustion rate

D. Increase the gas production rate

5571. Fuel for a fast breeder nuclear reactor is____________________?
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A. Radium

B. Uranium

C. Neptunium

D. Plutonium
5572. Bituminous coal___________________?
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A. Ignites less easily than anthracite

B. Is generally coking

C. Burns with smoky yellow flame

D. Both B. and C.
5573. Which of the following fuels is generally not used in thermal power plant boiler firing ?
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A. Coal middling from washeries

B. Furnace oil, light diesel oil and tar/PCM

C. Pulverised coking coal

D. B.F. gas, coke oven gas and L.D. converter gas

5574. A coal having high amount of volatile matter____________________?
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A. Produces very little of tar and gas on carbonisation

B. Ignites easily and burns with long smoky flame

C. Would require smaller combustion chamber

D. All A., B. and C.
5575. Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt using theoretical amount of air in___________________?
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A. Either A. or B. without gain or loss of heat

B. Either A. or B.

C. Oxygen

D. Air

5576. Pick out the wrong statement?
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A. Vulcanised rubber is more elastic than natural rubber

B. Polymers made of more than one monomer is called copolymer or mixed polymer

C. res

D. The intermolecular forces in thermoplastic polymers are intermediate to that of elastomers &

E. Polymers made of only one monomer is called homopolymer
5577. Which is the heaviest fuel gas out of the following ?
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A. Coke oven gas

B. Blast furnace gas

C. Carburetted water gas

D. Water gas

5578. Preheating of coal charge for the coke ovens reduces the __________________?
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A. Fuel consumption in coking

B. All A., B. and C.

C. Time of carbonisation

D. Yield of gas and tar

5579. Artificial draught produced by a fan can be controlled by the___________________?
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A. Speed of the fan

B. Variation in the pitch of the fan blades

C. Damper

D. All A., B. and C.
5580. Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300 C to avoid the___________________?
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A. Chances of clinker formation

B. Requirement of large volume combustion chamber

C. Risk of explosion

D. Incomplete combustion of coal