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
Related Mcqs:
- 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 - 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 - 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. - Pick out the correct statement about catalytic polymerisation ?
A. H2SO4 polymerisation process gives gasoline rich in unsaturates
B. In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho
H3PO4 formation, which are inactive
C. Both A. and B.
D. Neither A. nor B. - 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 - 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 - 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
thermal cracking
D. Operating pressure and temperature in thermal cracking process is more than that in catalytic
cracking process - 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 - Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene ?
A. Smoking tendency of hydrocarbons increases in the order: paraffins → isoparaffins →
naphthenes → aromatics
B. Smoking tendency of paraffins increases with decrease in its molecular weight
C. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on
addition of double bond
D. Smoking tendency of aromatics decreases with increase in its molecular weight - 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
