Chemical Engineering MCQs

Page No. 512

Presence of sulphur in gasoline___________________?


aLeads to corrosion

✓


bIncreases lead susceptibility

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cDecreases gum formation

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dHelps during stabilisation

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View Answer Leads to corrosion

Higher viscosity of lubricating oil usually signifies_______________________?


aLower Reid vapour pressure

✖


bHigher acid number

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cHigher flash point and fire point

✓


dLower flash point and fire point

✖



Which of the following fractions of a crude oil will have the maximum gravity API (i.e. °API) ?


aDiesel

✖


bGasoline

✖


cAtmospheric gas oil

✓


dVacuum gas oil

✖


View Answer Atmospheric gas oil

Smoke volatility index is equal to smoke point plus______________________?


a0.42 × (% distilled at 204°C)

✓


b5 mm

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c0.84 × (% distilled at 204°C)

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d10 mm approximately

✖



Diesel index (an alternative index for expressing the quality of diesel) is_______________?


aDetermined by using a test engine

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bNot related to aniline point

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cEqual to cetane number plus 3

✓


dAll A., B. & C.

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Catalyst used in the catalytic cracking is_____________________?


aSilica-alumina

✓


bSilica gel

✖


cVanadium pentoxide

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dNickel

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View Answer Silica-alumina

For gasoline, the flash point (<50°C) is determined by the______________________?


aAbel apparatus

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bPensky-Marten’s apparatus

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cSaybolt chromometer

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dNone of these

✓


View Answer None of these

Main constituent of natural gas is___________________?


aCH4

✓


bC2H2

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cC2H4

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dC2H6

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View Answer CH4

Crude oil is subjected to vacuum distillation in the last stage, because_________________?


aHigh boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose

✓


bLighter/low boiling products are prone to thermal decomposition

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cHigh purity products can be obtained thereby

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dNone of these

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Mercaptans are________________?


aLow boiling sulphur compounds

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bAdded in LPG cylinders to detect gas leakage by its smell

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cUndesirable in petrol, as they reduce its octane number

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dAll A., B. and C.

✓


View Answer All A., B. and C.

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