Chemical Engineering MCQs

Page No. 349

Pick out the wrong statement ?


aHigher specific gravity of petroleum products means higher C/H ratio

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bAromatics have lower specific gravity than corresponding paraffins

✓


cHydrocarbons of low specific gravity (e.g., paraffins) possess the maximum thermal energy per unit volume

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dHydrocarbons of high specific gravity (e.g., aromatics) possess the maximum thermal energy per unit weight

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View Answer Aromatics have lower specific gravity than corresponding paraffins

Pick out the additive property of lube oil out of following ?


a°API gravity

✓


bSpecific gravity

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cViscosity

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dFlashpoint

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View Answer °API gravity

Pick out the wrong statement ?


aAlkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin

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bCatalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts

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cAll the alkylation processes use very high temperature (> 1000°C)

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dGasoline having an octane number of 90 can be produced by alkylation process

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View Answer All the alkylation processes use very high temperature (> 1000°C)

Pick out the correct statement pertaining to catalytic cracking ?


aWith increase in the reactor pressure, octane number of gasoline decreases

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bWith increase in the reactor temperature, gasoline yield decreases for a given conversion

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cPercentage conversion increases with increase in the catalyst to oil ratio

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dAll A., B. and C.

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View Answer All A., B. and C.

Choose the correct statement regarding thermal cracking ?


aModerate changes in operating temperature does not change the depth of cracking

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bIncreased residence time results in the decreased severity of cracking

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cAt low pressure, the yield of lighter hydrocarbons are more

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dGreater depth of cracking gives lower octane number gasoline

✓


View Answer Greater depth of cracking gives lower octane number gasoline

Pick out the wrong statement ?


aIso-paraffin crack faster than n-paraffin.

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bCatalytic cracking is endothermic, but the regeneration of catalyst is exothermic

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cRate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking

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dNone of these

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View Answer Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic

Pick out the wrong statement ?


aPensky-Marten apparatus is used for determining flash points above 50°C

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bCharacterisation factor of paraffinic crude oil is more than 12

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cAbel apparatus is used for determining flash points below 50°C

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dAn oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

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View Answer An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

Pick out the wrong statement?


aAromatics have higher specific gravity than paraffins

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bGross calorific value (GCV) of petrofuels is equal to (12400 – 2100 ρ2) where, ρ is the specific gravity of the fuel at 15.5°C

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cHeavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)

✓


dHigher specific gravity of petrofuels means higher C/H ratio

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View Answer Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)

Choose the correct statement ?


aOctane number of i-octane is zero

✓


bOctane number of paraffins increases with increasing number of carbon atoms

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cBranched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms

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dThe aromatics have lower octane number than naphthenes with same number of carbon atoms

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View Answer Octane number of i-octane is zero

Choose the correct statement?


aCoking tendency increases with increasing molecular weight

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bCoking tendency decreases with increasing molecular weight

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cHigher pressure enhances coke formation

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dCoking is an exothermic reaction

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View Answer Coking tendency increases with increasing molecular weight

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