更多"Diesel engine air start system chec"的相关试题:
[单项选择]Diesel engine air start system check valves are opened by （）
A. an air start cam
B. cylinder compression pressure
C. starting air pressure
D. valve springs
[单项选择]Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to （）
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
[单项选择]The timing of diesel engine air starting valves is controlled by（）
A. the air start valve timing gears and rods
B. a cylinder check valve
C. individual cams and valve gear
D. an air manifold poppet valve
[单项选择]When a diesel engine compression pressure is checked, the indicator is connected to the （）
A. cylinder exhaust ports
B. injection line
C. cylinder indicator cock
D. banjo oiler line
[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]As for a diesel engine, lack of combustion air may be due to （）.
A. fouling turbine
B. fuel pump faults
C. lubrication failure
D. excessive cooling
[单项选择]A diesel engine fails to start due to excessive water in the fuelBefore the engine can be started, the water should be removed from the（）
A. fuel lines
B. lube oil filter
C. crank case pump
D. rocker arm reservoir
[单项选择]A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?
A. turn engine with jacking gear
B. drain filters and strainers and bleed off water at each injection pump
C. use ether to start the engine with blow-down valves open
D. blow through the cylinders and fuel lines with a drying agent
[单项选择]If a diesel engine fails to start，one of the likely causes is （）
A. low compression temperature
B. low ambient air pressure
C. high lube oil pump pressure
D. high fuel oil booster pump pressure
[单项选择]
In a diesel engine, exhaust valves open before the intake ports are uncovered to （）
Ⅰ.reduce pumping losses
Ⅱ.reduce back pressure
A. Ⅰonly
B. Ⅱonly
C. bothⅠand Ⅱ
D. neitherⅠnor Ⅱ
[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]If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
A. compression pressures are below normal
B. lube oil is diluted with fuel oil
C. cranking speed is too low
D. exhaust system is partially restricted
[单项选择]An auxiliary diesel engine may fail to start due to（）
A. low exhaust back pressure
B. high lube oil temperature
C. insufficient cranking speed
D. excessive fuel atomization
[单项选择]In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）
A. increased engine back pressure
B. sulfuric acid corrosion
C. surface pitting of the turbocharger
D. moisture impingement on the turbocharger compressor blade
[单项选择]In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
A. raw water pump discharge
B. expansion tank outlet
C. cooling water heat exchanger
D. outlet engine jacket water outlet
[单项选择]The intake valves in a diesel engine are reseated by （）.
A. cam followers
B. push rods
C. combustion gases
D. valve springs
[单项选择]A diesel engine could fail to start because of （）
A. incorrect injection timing
B. low exhaust back pressure
C. floating exhaust valves
D. excessive cranking speed
[单项选择]A diesel engine may fail to start due to （）
A. low air charge temperature
B. high cranking speed
C. excessive fuel dilution of lube oil
D. high compression pressure
[单项选择]A diesel engine crankcase ventilation system （）
A. prevents spark generation
B. removes combustible gases
C. determines the level of combustible gases
D. provides inert gas generation in crankcase
