31. Octane number (unleaded) of reformed gasoline may be upto
32. The reservoir rock containing petroleum has
33. Sour crude means the __________ bearing crude.
34. Penetration test determines the __________ of the grease.
35. Isomerisation converts the __________ tot-paraffins.
36. Which of the following additives improves the cetane number of diesel?
37. Which of the following is an additive used for improving the cetane number of diesel?
38. Catalyst used in alkylation process is
39. Molecular weight of petrol may be about
40. Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is
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