52. Char value of Kerosene is the amount of charred oil deposition on the wick obtained after burning it in a standard wick lamp at a standard rate for 24 hours. Char value of a good quality kerosene should be less than _________ mg/kg of kerosene.
1
20
100
500
Correct answer: (B) 20
53. Choose the correct statement regarding thermal cracking.
Moderate changes in operating temperature does not change the depth of cracking
Increased residence time results in the decreased severity of cracking
At low pressure, the yield of lighter hydrocarbons are more
Greater depth of cracking gives lower octane number gasoline
Correct answer: (D) Greater depth of cracking gives lower octane number gasoline
54. Choose the correct statement.
Octane number of i-octane is zero
Octane number of paraffins increases with increasing number of carbon atoms
Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms
The aromatics have lower octane number than naphthenes with same number of carbon atoms
Correct answer: (A) Octane number of i-octane is zero
55. Clay treatment is used to remove
Salt from the crude oil
Colour & dissolved gases from cracked gasoline
Wax from lube oil
None of these
Correct answer: (C) Wax from lube oil
56. Clay treatment of petroleum products
Decolorizes & stabilises cracked gasoline
Desulphurise straight run gasoline & kerosene
Adsorb arsenic from feedstock to catalytic reforming
All (A), (B) & (C)
Correct answer: (D) All (A), (B) & (C)
57. Complete removal of _________ from gasoline is done by Unisol process using caustic soda and methyl alcohol.
Waxes
Mercaptans
Asphalt
Diolefins
Correct answer: (B) Mercaptans
58. Concentration of H2SO4 catalyst in alkylation is kept between 90-98%, because H2SO4 having concentration.