Chemical Engineering MCQs

Page No. 512

Presence of sulphur in gasoline___________________?


aLeads to corrosion


bIncreases lead susceptibility


cDecreases gum formation


dHelps during stabilisation


View Answer Leads to corrosion

Higher viscosity of lubricating oil usually signifies_______________________?


aLower Reid vapour pressure


bHigher acid number


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


c0.84 × (% distilled at 204°C)


d10 mm approximately



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


aDetermined by using a test engine


bNot related to aniline point


cEqual to cetane number plus 3


dAll A., B. & C.



Catalyst used in the catalytic cracking is_____________________?


aSilica-alumina


bSilica gel


cVanadium pentoxide


dNickel


View Answer Silica-alumina

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


aAbel apparatus


bPensky-Marten’s apparatus


cSaybolt chromometer


dNone of these


View Answer None of these

Main constituent of natural gas is___________________?


aCH4


bC2H2


cC2H4


dC2H6


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


cHigh purity products can be obtained thereby


dNone of these



Mercaptans are________________?


aLow boiling sulphur compounds


bAdded in LPG cylinders to detect gas leakage by its smell


cUndesirable in petrol, as they reduce its octane number


dAll A., B. and C.


View Answer All A., B. and C.

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