A.provide added wear protection against today’s corrosive quality of fuel
B.increase overall valve strength due to the high gas pressures
C.assist in dissipating heat due to the extreme operating temperatures
D.reduce the overall weight of the valve thus helping eliminate valve spring surge and hammering
您可能感興趣的試卷
你可能感興趣的試題
A.Excessive piston to liner clearance
B.The underside of the piston crown being excessively dirty lowering the rate of heat transfer
C.Faulty nozzle spray
D.All of the above
A.improve skirt lubrication
B.allow for expansion
C.transmit forces evenly
D.improve the piston seal
A.Hard alloy steel construction
B.Beveled edges on the valve head
C.Low alloy steel construction
D.Poppet type design
A.a leaking seal ring
B.heat transfer from exhaust valves
C.restricted cooling passages
D.overheated intake valves
A.top of the ring groove
B.back of the ring groove
C.bottom of the ring groove
D.piston ring end clearance
最新試題
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
The cetane rating of diesel fuel is an indication of the （）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The main purpose of port State control is not to（）
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.
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）