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
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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
A.power the after-coolers
B.power the turbocharger
C.reduce the cylinder scavenge effect
D.cool the turbocharger
A.corrosive deterioration of a bearing
B.inadequate air filtration
C.excessive ring and liner wear
D.excessive cooling of lubricating oil
A.lower than normal cylinder pressure and low exhaust temperature
B.lower than normal cylinder pressure and high exhaust temperature
C.higher than normal cylinder pressure and low exhaust temperature
D.higher than normal cylinder pressure and high exhaust temperature
A.engine displacement
B.super-aspirating
C.air injection
D.supercharging
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A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
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（） is not installed on the main switchboar.
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
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