51. __________ is not an important refinery process for upgrading the quality of lubricating oil.
52. Smoke point of a test sample of kerosene is found to be 15 mm. On removal of __________ from it, the smoke point rises to 25 mm.
53. __________ test is done to find out the softening point of bitumen.
54. Pick out the wrong statement.
55. Which is an anticing compound?
56. In the atmospheric pressure crude distillation, the content of __________ from lighter fraction to heavier ones.
57. Naphthenic acid is represented by
58. Hydrocracking employs
59. Pick out the correct statement.
60. Solvent used in duo-sol extraction for lube oil upgradation is a mixture of
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