Chemical Engineering MCQs

Page No. 311

Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ‘using theoretical amount of air in___________________?


aAir

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bOxygen

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cEither A. or B.

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dEither A. or B. without gain or loss of heat

✓



__________ is used as jet engine fuel ?


aPetrol

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bDiesel

✖


cKerosene

✓


dLPG

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View Answer Kerosene

Tar is a better fuel than furnace oil, because of its___________________?


aHigher calorific value

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bLower sulphur content

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cHigher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate

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dBoth A. and B.

✓


View Answer Both A. and B.

In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________?


aAmmonia yield is more

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bAliphatic tar is produced

✓


cFree carbon in tar is more

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dAll A., B. and C.

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Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?


aMulticyclones

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bBag filter

✓


cWet scrubber

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dHydrocyclones

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View Answer Bag filter

Artificial draught produced by a fan can be controlled by the___________________?


aSpeed of the fan

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bDamper

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cVariation in the pitch of the fan blades

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Out of the following, which is the most important parameter for the blast furnace grade coke ?


aCSR & CRI

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bAsh content

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cMoisture content

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dVolatile matter content

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View Answer CSR & CRI

Coke having higher porosity has ___________________?


aLower bulk density

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bLower strength

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cHigher reactivity

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Coals used for the generation of producer gas should have ____________________?


aHigh caking index

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bLow fusion point of ash

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cHigh volatile matter content

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dVery low ash content (8-10%)

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Caking coal is desirable for_________________?


aBurning on travelling grate

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bCoke making

✓


cBurning on firebars

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dAll A., B. and C.

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View Answer Coke making

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