Classification of Lubricating System – 1

·         Lubricating grease is a solid to semi-solid dispersion of a thickening agent in liquid lubricant.

Answer: True

·         Greases perform better than oils under conditions requiring

Answer: Greases perform better than oils under conditions requiring
a) high bearing loads and shock loads
b) slow journal speed
c) temperature extremes
d) cleanliness or avoidance of splash
e) minimum attention
f) a seal against external contaminants
g) large bearing clearances.

·         The various types of greases used for lubrication are

Answer: The various types of greases used for lubrication are
a) calcium soap greases
b) sodium soap greases
c) aluminium soap greases
d) mixed soap greases
e) barium soap greases
f) lithium soap greases
g) pure petroleum greases.

·         Wet sump lubrication system employ a large capacity oil sump at the base of crank chamber, from which the oil is drawn by a low pressure oil pump and delivered to various parts.

Answer: True

·         Splash system is suitable for high and medium speed engines having moderate bearing load pressures.

Answer: In fact, splash system is suitable for low and medium speed engines having moderate bearing load pressures.

·         Semi pressure system is a combination of splash and pressure systems.

Answer: True

·         Semi pressure system does not enables higher bearing loads and engine speeds to be employed as compared to splash system.

Answer: Semi pressure system enables higher bearing loads and engine speeds to be employed as compared to splash system.

·         In full pressure system, oil from oil sump is pumped under pressure to the various parts requiring lubrication.

Answer: True

·         Full pressure sump lubrication system is generally adopted for high capacity engines.

Answer: Dry sump lubrication system is generally adopted for high capacity engines.