更多"Dirt lodged on the nozzle valve sea"的相关试题:
[单项选择]A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to ()
A. feel the high pressure fuel line
B. check the cylinder exhausts for white smoke frequently
C. check the cylinder exhaust temperature
D. isolate each cylinder and inspect the injector
[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]If the needle valve in a fuel injection nozzle sticks open ().
A. no fuel will be delivered through the nozzle
B. the nozzle will overheat and crack
C. time of injection will change
D. fuel will leak into the drain line
[单项选择]Dirt in the fuel oil system of a diesel engine can cause ().
A. clogged filters
B. poor combustion
C. overloading of the diesel
D. shock of fuel lines
[单项选择]Dirt in a fuel oil system of a diesel engine can cause ()
A. damage to strainers
B. over-speeding of the engine
C. excessive cooling of the engine
D. injector damage
[单项选择]The needle valve will open when the fuel pressure acting on the needle valve () exerts a sufficient force to overcome the spring compression.
A. tape face
B. tapered face
C. surface
D. thinner face
[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]A fuel injection valve opening at pressure lower than normal will result in().
A. late fuel injection
B. early fuel injection
C. high exhaust temperature from that cylinder
D. decreased effective stroke from that injector
[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]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]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
[单项选择]A fuel leak occurs in the high pressure fuel piping between the injection pump and fuel nozzleThis requires immediate repair because of the ()
A. high cost of fuel
B. serious fire hazard
C. possibility of pollution
D. poor combustion which will occur in that cylinder
[单项选择]Air in the fuel lines to the fuel injection nozzles of a diesel will result in ().
A. lower compression pressures
B. overheating without smoking
C. failure to start
D. a run away without load
[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]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