更多"The diesel engine valve subjected t"的相关试题:
[单项选择]Worn diesel engine intake valve guides can result in （）
A. increased engine breathing efficiency
B. excessive valve lash
C. excessive lube oil consumption
D. lower than normal fuel consumption
[单项选择]Trunk-type diesel engine pistons are most effectively cooled by heat（）
A. conducted through the engine block
B. conducted to water cooled cylinder walls
C. conducted through the piston crown
D. loss to escaping exhaust gases
[单项选择]Diesel engine valve springs function to （）
A. hold the valves open
B. keep the valves off their seats until the exhaust stroke is completed
C. close the valves
D. open inlet valves when the air injection cycle begins
[单项选择]Diesel engine air start valve timing is controlled by（）
A. engine operating speed
B. an air manifold
C. a hydraulic distributor
D. individual cams and valve gear
[单项选择]For an ordinary four-stroke engine the inlet valves open （）
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[单项选择]In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.
A. downwards；upwards
B. upwards；downwards
C. downwards；downwards
D. upwards；upwards
[单项选择]Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）
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
[单项选择]Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）
A. later and close sooner
B. sooner and close later
C. sooner and close sooner
D. later and close later
[单项选择]The valve which is most suited for regulating the flow through a pipeline is a （）
A. gate valve
B. globe valve
C. swing-check valve
D. plug-cock valve
[单项选择]If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）
A. liquid in the cylinder
B. low compression in the cylinder
C. high exhaust temperature
D. poor fuel penetration
[单项选择]If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer, those valves will （）
A. open late and close early
B. open late and close late
C. fail to open when the engine is cold
D. fail to open at normal operating temperature
[单项选择]In all but the most severe cases，bleeding from a wound should be controlled by（）.
A. applying direct pressure to the wound
B. submerging the wound in lukewarm water
C. cooling the wound with ice
D. applying a tourniquet
[单项选择]The most common diesel engine fuel system problems are caused by （）.
A. incorrect adjustments
B. dirty fuel
C. broken fuel lines
D. excessive vibration
[单项选择]（） allows the engine to be placed wherever is most suitable, as they no longer have to be aligned with reduction gearing and shafting as is the case with conventional installations.
A. Diesel engine propulsion
B. Diesel electric propulsion
C. Steam engine propulsion
D. Gas turbine propulsion
[单项选择]Most often （） is attached to the engine-propeller shaft for efficient electric power generation.
A. a variable-speed AC generator
B. a fixed-speed AC generator
C. an air blower
D. a DC generator
[单项选择]The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing workThis is known as （）.
A. indicated horsepower
B. brake horsepower
C. net horsepower
D. friction horsepower
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A. be jammed
B. be opened
C. be seated
D. be broken
[单项选择]Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A. low oil pressure
B. high coolant pressure
C. leaking fuel injector
D. cracked cylinder head or liner
