On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so （） that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.
1、As to the piston cooling, of the follo
As to the piston cooling, of the following, which statement is not true?（）ABecause the piston is exposed to very high temperature, it must b...
2、Medium speed engines have a （） power t
Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.Ahigher；reducedBhigher；increasedClower；reducedDlower；increased
3、The pistons are cooled by oil supplied
The pistons are cooled by oil supplied from the forced （） system.Afresh waterBsea waterClubricationDfuel oil
4、Piston cooling fins are located（）
Piston cooling fins are located（）Aatop the piston crownBbeneath the piston crownCat the base of the piston skirtDinside the cylinder liner cooling water jacket
5、The main purpose of the piston oil scr
The main purpose of the piston oil scraper rings is to （）.Aseal the space between the piston and the linerBreduce the amount of lube oil b...
6、Lube oil accumulating in the cooling w
Lube oil accumulating in the cooling water system of a diesel engine will result in （）Alube cooler failureBpoor heat transferCmechanical lubricator failureDcamshaft seizure