Viscosity index improver (like polystyrene or polyisobutylene) is added to lubricant to

A. Reduce its viscosity

B. Increase its viscosity

C. Reduce the variation in its viscosity with temperature

D. Increase the variation in its viscosity with temperature

Related Questions

  1. Calcination of gypsum produces
  2. __________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.
  3. __________ is produced by the dehydrogenation of ethyl benzene.
  4. Chloral is used in the manufacture of
  5. A good quality coal should have
  6. Which of the following is the purest form of water out of the following?
  7. Commonly used glass is known as the __________ glass.
  8. __________ is not a constituent of gun powder.
  9. __________ is used as a catalyst in fat splitting.
  10. Which of the following is an unsaturated fatty acid?
  11. Absorption of SO3 in 97% H2SO4 is
  12. The difference between saponification value and acid value is
  13. Styrene is produced from ethyl benzene by the process of
  14. Which of the following is not produced commercially from sea water?
  15. Shaving soaps are
  16. Sudden temperature fluctuation does not affect pyrex glass, because of its
  17. Hydrogenation of edible vegetable oils
  18. The combustion reaction, C + O2 = CO2, is
  19. The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by
  20. Which one of the following is not an elastomer?
  21. Bordeaux mixture is a/an
  22. Fire clay is __________ refractory material.
  23. Dense soda ash used in the manufacture of glass, is chemically represented by
  24. Diaphragm electrolytic cell as compared to mercury electrolytic cell
  25. Kopper-Totzek coal gasifier
  26. Sulphur addition in soap is done to
  27. Massecuite is
  28. Saponification number of an oil or fat
  29. Flux addition during smelting of ore is done to
  30. Ore concentration by froth floatation utilises the __________ of ore particles.

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