Mechanism of Lubrication

·         Lubrication is the admittance of oil between two surfaces having relative motion.

Answer: True

·         The objective of lubrication is to reduce friction between the parts having relative motion.

Answer: True

·         The objective of lubrication is to reduce wear of the moving parts.

Answer: True

·         The objective of lubrication is to cool the surfaces by carrying away heat generated due to friction.

Answer: True

·         The objective of lubrication is to absorb shocks between bearings and other parts and consequently reduce noise.

Answer: True

·         The objective of lubrication is to reduce dirt and girt that might have crept between the rubbing parts.

Answer: True

·         A slippery bearing material is not desirable during starting and stopping, but once the oil film is established the bearing material is less important.

Answer: Actually, a slippery bearing material is desirable during starting and stopping, but once the oil film is established the bearing material is less important.

·         ____________ is the speed of journal, more will be the oil pulled into the apex of the wedge of oil in the clearances space.

Answer: Higher

·         An increase in supporting pressure will ____________ the oil film thickness, and decreases the eccentricity.

Answer: increases

·         If the eccentricity is decreased, the supporting pressure must ____________

Answer: If the eccentricity is decreased, the supporting pressure must decrease because the sides of the wedge are more nearly parallel.