更多"Heat damage to fuel injection nozzl"的相关试题:
[单项选择]Heat damage to fuel injection nozzles can be prevented by avoiding （）
A. excessive fuel oil temperature
B. long periods of engine overload
C. metallic contact between nozzles and cylinder heads
D. hard carbon deposit and varnish on the nozzles
[单项选择]Most fuel injection nozzles are opened by （）.
A. fuel oil pressure
B. a cam operated follower
C. a spring-loaded pressure plate
D. timing gears keyed to the crankshaft
[单项选择]To prevent vibration damage to the fuel supply line of a diesel engine, you may use （）.
A. a short length of heavy duty clear plastic tubing
B. a length of approved flexible nonmetallic hose
C. welded flange connections for all joints
D. aluminum piping with expansion loops
[单项选择]A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by，the next step is to（）.
A. proceed with fueling operation
B. have helicopter move to a safer location
C. wash spilled fuel away with a flood of water
D. clean spilled fuel with rags
[单项选择]What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）
A. Electricity
B. Chain reaction
C. Pressure
D. Smoke
[单项选择]Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?（）
A. Chain reaction
B. Thermal action
C. Chemical occlusion
D. Pyrotechnical reaction
[单项选择]Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）
A. electronic ignition system
B. compression of air by the piston
C. friction in the fuel injector
D. fuel oil bearing system
[单项选择]Your vessel is taking on fuel oil when a small leak develops in the hose and you have ordered the pumping stoppedBefore resuming pumping，you should（）.
A. notify the terminal superintendent
B. place a large drip pan under the leak and ping the scuppers
C. repair the hose with a patch
D. replace the hose
[单项选择]The four basic components of a fire are fuel, heat, oxygen and a chain reactionWhich of the following statements best describes what must be eliminated to extinguish a fire?（）
A. Any one component can be eliminated to extinguish a fire
B. Any two components must be eliminated to properly extinguish a fire
C. Any three components must be eliminated to properly extinguish a fire
D. Ali four components must be eliminated to extinguish any fire
[单项选择]The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?（）
A. the burning
B. the fuel
C. the air charge
D. the engine piston
[单项选择]Fuel injection systems meter fuel, atomize fuel, and （）.
A. create turbulence in the combustion chamber
B. aid in completing cylinder scavenging
C. inject fuel at the proper time
D. minimize fuel penetration into the cylinder
[单项选择]Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from （）.
A. within the space concerned
B. outside the space concerned
C. the throttle station
D. within the fire room
[单项选择]The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.
A. has begun
B. takes place
C. occurs
D. happens
[单项选择]A fuel line breaks, sprays fuel on the hot exhaust manifold, and catches fire. Your first action should be to（）.
A. Batten down the engine room
B. start the fire pump
C. apply carbon dioxide to the fire
D. shut off the fuel supply
[单项选择]The fuel booster pump and steam to fuel heater, together with fuel pipe heater tracer line should be shut off as soon as the （） order is acknowledged.
A. finished with engines
B. stop
C. stand by
D. full ahead
[单项选择]The high-pressure fuel opens the fuel valve and is sprayed into the cylinder in tiny droplets known as （）.
A. injection
B. penetration
C. atomization
D. compression
[单项选择]（）is harmful for fuel pumps, fuel valves, cylinder liner, exhaust valve seats, and the turbocharger blades as well.
A. Bad combustion of the fuel
B. Bad atomization of the fuel
C. Liquid contaminants
D. Solid contaminants
[单项选择]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.
A. cold corrosion of the nozzles
B. fuel viscosity for better atomization
C. carbon accumulation on the nozzles
D. fuel detonation in the cylinders
[单项选择]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
A. ensure penetration and distribution of the fuel in the combustion chamber
B. ensure the needle valve is flushed clean during each injection
C. prevent combustion gas blowback into the open needle valve
D. prevent reflected pressure waves when the needle valve closes
