21. Visbreaking
22. Smoke volatility index is equal to smoke point plus
23. Antioxidants are added in petrol to
24. Solvent used for dewaxing of petroleum products are
25. Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about __________ ppm.
26. A typical yield of diesel in straight run distillation of crude oil may be about __________ percent.
27. A typical yield of kerosene in straight run distillation of crude oil may be about __________ percent.
28. Naphtha yield in straight run distillation of crude oil may be about __________ percent.
29. Which of the following processes in oil refinery does not employ 'cracking'?
30. Most widely used solvent for dewaxing is
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