51. Glycol added to petrol acts as a/an __________ agent.
52. Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil
53. Which one is used to determine the colour of petroleum products ?
54. Feedstock for the production of biodiesel is
55. The proper arrangement of the petroleum fractions in order of their boiling points is
56. Octane number of gasoline produced by two stage fluidised catalytic cracking process is
57. Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to
58. Testing of the knocking characteristics of petrofuels is done in a __________ engine.
59. Name the hydrocarbon having the poorest oxidation stability.
60. The first crude oil refinery of India is located at
61. Olefins are
62. Which of the following is desirable in diesel and kerosene but is undersirable in gasoline ?
63. Phenols are added in gasoline to
64. The pressure (kg/cm2 ) and temperature (°C) maintained in electrical desalters for crude oil are respectively
65. The average boiling point of aviation turbine fuel is closest to that of
66. Crude oil is transported inland from oil field to refineries, mainly by the
67. Solvent used for dewaxing of petroleum products are
68. The most widely used crude topping column in refineries is the __________ column.
69. Deoiling of wax is done by its
70. Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about __________ °C.
71. Molecular weight of crude petroleum may be around
72. Mercaptans is represented as (where R and R' are alkyl groups)
73. Petrolatum is
74. Electrical desalting of crude oil removes the __________ impurities.
75. An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating.