单项选择题

In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）

A.sea water temperature must never be warmer than 40℃
B.jacket water pressure should always be greater than the sea water pressure
C.jacket water temperature must always be less than 60℃
D.jacket water pressure must always be less than the sea water pressure

点击查看答案&解析

上一题目录下一题

相关考题

单项选择题

In a medium speed diesel engine, a trunk type piston may be cooled by（）
Ⅰ.oil circulation though passages in the piston crown
Ⅱ.heat transfer through piston rings and liner wall

A.Ⅰ only
B.Ⅱ only
C.either Ⅰ or Ⅱ
D.neither Ⅰ or Ⅱ

单项选择题

The exhaust system for a turbocharged diesel engine functions to （）

A.power the after-coolers
B.power the turbocharger
C.reduce the cylinder scavenge effect
D.cool the turbocharger

单项选择题

If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）

A.corrosive deterioration of a bearing
B.inadequate air filtration
C.excessive ring and liner wear
D.excessive cooling of lubricating oil