Types of Lubricants

·         The ____________ are obtained from the residual mass left during crude petroleum distillation.

Answer: mineral lubricating oils

·         Parafins crudes generally give a lower yield of lubricating oils than napthenic crudes.

Answer: Actually, parafins crudes generally give a higher yield of lubricating oils than napthenic crudes.

·         In mineral lubricating oils, bubble towers are used for fractionalisation of oil into two or three fractions of different viscosities.

Answer: True

·         Fatty oils from animal and vegetable origin are sometimes used alone but are frequently mixed with mineral oils.

Answer: False

·         Olive oil is employed for lubricating textile machinery.

Answer: Olive oil is employed for lubricating textile machinery, as it can be easily washed out from cloth without leaving any stain.

·         Lard oil is used for making lubricants for railway engines.

Answer: Rapeseed oil is used for making lubricants for railway engines.

·         Rapeseed oil is used for producing lubricants for internal combustion engines.

Answer: Lard oil is used for producing lubricants for internal combustion engines.

·         Caster oil is usually compounded with heavy mineral oils for making extreme pressure lubricants.

Answer: True

·         The types of synthetic lubricants are

Answer: The types of synthetic lubricants are
a) dibasic acid esters
b) organo-phosphate esters
c) silicate esters
d) silicin polymers
e) polyglycolethers and related compounds
f) fluorinated and chlorinated hydrocarbon compounds.

·         The types of synthetic lubricants are

Answer: The types of synthetic lubricants are
a) dibasic acid esters
b) organo-phosphate esters
c) silicate esters
d) silicin polymers
e) polyglycolethers and related compounds
f) fluorinated and chlorinated hydrocarbon compounds.