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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 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)
Choose the correct statement ?
A Octane number of i-octane is zero
B Octane number of paraffins increases with increasing number of carbon atoms
C Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms
D The aromatics have lower octane number than naphthenes with same number of carbon atoms
Correct Answer: Octane number of i-octane is zero
Choose the correct statement?
A Coking tendency increases with increasing molecular weight
B Coking tendency decreases with increasing molecular weight
C Higher pressure enhances coke formation
D Coking is an exothermic reaction
Correct Answer: Coking tendency increases with increasing molecular weight
Pick out the correct statement?
A Paraffins have higher octane number than corresponding iso-paraffin
B Paraffins have lower smoke point than aromatics
C Suitability of kerosene as a fuel & as an illuminant may be determined by char value test
D Aviation fuel should have very high cloud point
Correct Answer: Paraffins have lower smoke point than aromatics
Pick out the wrong statement?
A Multigrade lubricating oils have high viscosity index
B Paraffinic oil has very high viscosity index
C Naphthenic oil has very low viscosity index
D High viscosity index means a large change in viscosity with change in temperature
Correct Answer: High viscosity index means a large change in viscosity with change in temperature
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