[单项选择]In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）
A. noise coming from that air starting valve
B. continuous operation of the starting air compressor
C. zero air pressure in the air starting system
D. overheated starting air pipe to the cylinder head

更多"In an operating diesel engine, whic"的相关试题:

[单项选择]A smoking exhaust from an operating diesel engine could be caused by （）
A. low sulfur content in the fuel
B. a loose injector inlet connection
C. late fuel injection
D. high injection pressure

查看答案

[单项选择]The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）
A. expansion of the combustion gases
B. exhaust and intake valves just closing
C. maximum compression is just being attained
D. fuel injection occurring at that point and combustion begins

查看答案

[单项选择]In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.
A. metal particles loosened by wear
B. air when no air cleaners are used
C. condensation of water vapors
D. breakdown of the lubricating oil by dilution

查看答案

[单项选择]In an operating diesel engine, pre-ignition can be caused by （）
A. excessively late fuel injection
B. oil in the air charge
C. water in the fuel
D. injection continuing after the fuel charge is ignited

查看答案

[单项选择]An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）
A. restricted turbocharger air intake
B. oil leak into the turbocharger
C. dribbling injector
D. low fuel viscosity

查看答案

[单项选择]Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）
A. Exhaust temperature
B. Lube oil level
C. Lube oil pressure
D. Water level in the expansion tank

查看答案

[单项选择]Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause （）.
A. the formation of sulfuric acid
B. a decrease in lube oil viscosity
C. a decrease in cooling water pH
D. a thermostat failure

查看答案

[单项选择]Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）
A. formation of carbon on the intake and exhaust ports
B. high water jacket temperatures
C. overheated pistons and cylinders
D. an increase in lube oil viscosity due to fuel dilution

查看答案

[单项选择]One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）
A. decrease in ignition lag
B. increase in fuel economy
C. reduction in lube oil viscosity
D. increase in cylinder misfiring

查看答案

[单项选择]The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
A. method of supplying air
B. cooling system
C. method of igniting fuel
D. valve operating mechanism

查看答案

[单项选择]A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.
A. slow-speed diesel
B. medium-speed diesel
C. high-speed diesel
D. constant-speed diesel

查看答案

[单项选择]Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.
A. decreased fuel consumption per brake horsepower
B. more complete cylinder scavenging
C. extended valve life
D. carbon formation on combustion chamber surfaces

查看答案

[单项选择]A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.
A. reduce the engine load
B. increase the cooling water flow
C. increase the lube oil pressure
D. adjust the fuel rack

查看答案

[单项选择]Which statement about diesel engine combustion is true?（）
A. Combustion does not begin until the piston starts down on the power stroke
B. Maximum combustion pressure is reached before TDC
C. Turbulence in the cylinder causes a delay in ignition
D. Maximum cylinder firing pressure is not developed until the piston passes TDC

查看答案

[单项选择]A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPMWhat is the speed reduction ratio?（）
A. 030 to 1
B. 300 to 1
C. 333 to 1
D. 330 to 1

查看答案

[单项选择]If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）
A. Fuel
B. Lubricating
C. Cooling
D. Ignition

查看答案

[单项选择]Which of the diesel engine cylinder liners listed has internal cooling water passages?（）
A. Internally finned liner
B. Externally finned liner
C. Wet liner
D. Integral water-jacket liner

查看答案

[单项选择]Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
A. Impeller
B. Compressor
C. After-cooler
D. Exhaust differ

查看答案

我来回答:

提交