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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

Pick out the wrong statement ?
A A pale color of petroleum product indicates lower viscosity
B Color of petroleum products indicates the degree of refinement
C Lighter petroleum distillates are lighter in color than the heavier residual oils
D Fluorescence of oils helps to detect its adulteration
Correct Answer: A pale color of petroleum product indicates lower viscosity
Pick out the wrong statement?
A Higher temperature is employed in visbreaking than in thermal cracking
B Pyrolysis is a mild thermal cracking process
C Lead susceptibility of petrol produced by catalytic process is more than that produced by
D Operating pressure and temperature in thermal cracking process is more than that in catalytic
Correct Answer: Higher temperature is employed in visbreaking than in thermal cracking
Pick out the wrong statement ?
A Higher specific gravity of petroleum products means higher C/H ratio
B Aromatics have lower specific gravity than corresponding paraffins
C Hydrocarbons of low specific gravity (e.g., paraffins) possess the maximum thermal energy per unit volume
D Hydrocarbons of high specific gravity (e.g., aromatics) possess the maximum thermal energy per unit weight
Correct Answer: Aromatics have lower specific gravity than corresponding paraffins
Pick out the additive property of lube oil out of following ?
A °API gravity
B Specific gravity
C Viscosity
D Flashpoint
Correct Answer: °API gravity
Pick out the wrong statement ?
A Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin
B Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts
C All the alkylation processes use very high temperature (> 1000°C)
D Gasoline having an octane number of 90 can be produced by alkylation process
Correct Answer: All the alkylation processes use very high temperature (> 1000°C)
Pick out the correct statement pertaining to catalytic cracking ?
A With increase in the reactor pressure, octane number of gasoline decreases
B With increase in the reactor temperature, gasoline yield decreases for a given conversion
C Percentage conversion increases with increase in the catalyst to oil ratio
D All A., B. and C.
Correct Answer: All A., B. and C.
Choose the correct statement regarding thermal cracking ?
A Moderate changes in operating temperature does not change the depth of cracking
B Increased residence time results in the decreased severity of cracking
C At low pressure, the yield of lighter hydrocarbons are more
D Greater depth of cracking gives lower octane number gasoline
Correct Answer: Greater depth of cracking gives lower octane number gasoline
Pick out the wrong statement ?
A Iso-paraffin crack faster than n-paraffin.
B Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic
C Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking
D None of these
Correct Answer: Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic
Pick out the wrong statement ?
A Pensky-Marten apparatus is used for determining flash points above 50°C
B Characterisation factor of paraffinic crude oil is more than 12
C Abel apparatus is used for determining flash points below 50°C
D An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index
Correct Answer: An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index
Pick out the wrong statement?
A Aromatics have higher specific gravity than paraffins
B Gross calorific value (GCV) of petrofuels is equal to (12400 – 2100 ρ2) where, ρ is the specific gravity of the fuel at 15.5°C
C Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)
D Higher specific gravity of petrofuels means higher C/H ratio
Correct Answer: Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)
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