A.poor cooling of cylinder walls
B.improper cooling of the piston
C.insufficient piston lubrication
D.all of the above
您可能感興趣的試卷
你可能感興趣的試題
A.natural aspiration
B.masked intake valves
C.air cells
D.scavenging air
A.excessive lube oil consumption
B.lower than normal lube oil temperature
C.higher than normal exhaust back pressure
D.excessive crankshaft end play
A.twice as large as with a cast iron piston
B.the same size as with a cast iron piston
C.half as large as with a cast iron piston
D.the same size as the crown of an aluminum piston
A.increase back pressure during the exhaust process
B.facilitate periodic replacement of the valves
C.reduce the pumping loss associated with scavenging
D.reduce tension on valve springs
A.excessive ring action
B.excessive ring temperature
C.improper ring rotation
D.excessive ring face wear
最新試題
The shipboard oil pollution emergency plan will be invalid after （）
Which of the following items don’t belong to dock repair works?（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Using a file without a handle may result in （）
The cetane rating of diesel fuel is an indication of the （）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
The condensers located in various stages of a flash evaporator are cooled by（）