Viscosity index improver (like polystrene 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
Answer: Option C
This Question Belongs to Chemical Engineering >> Chemical Process
A mixture of chlorine & sodium bromide acts as a/an
A. Insecticides
B. Analgesic drug
C. Fire retardant
D. Hydrogenation catalyst
__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.
A. Phosphates
B. Chromates
C. Sulphates
D. Bi-carbonates
Hydrazine (N2H4) is used mainly as a/an
A. Explosive
B. Rocket fuel
C. Detergents additive
D. None of these
Common salt is generally not produced commonly by __________ method from brine.
A. Freeze drying
B. Electrolytic
C. Solar evaporation
D. Vacuum evaporation
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