更多"The intake ports of a two-strike/cy"的相关试题:
[单项选择]Directional intake ports in diesel engines are used to （）.
A. reduce air charge turbulence
B. induce air swirl
C. deflect hot combustion gas away from the valves
D. oppose the effects of piston induced squish
[单项选择]When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
A. intake stroke
B. compression stroke
C. power stroke
D. exhaust stroke
[单项选择]In a four-stroke cycle diesel engine the intake valves open （）
A. before TDC and close after BDC
B. after TDC and close after BDC
C. before TDC and close before BDC
D. after TDC and close before BDC
[单项选择]In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）
A. wide compression rings are used
B. oil rings are located above the piston
C. chromium plating is used on all piston rings
D. oil rings are located near the bottom of the piston skirt
[单项选择]Diesel oil may be used to cool （） of a diesel engine.
A. cylinders
B. exhaust valves
C. pistons
D. fuel valves
[单项选择]Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）
A. an increased flash point
B. higher lube oil pressures
C. an increased viscosity
D. lower lube oil pressures
[单项选择]When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）
A. overloading the engine
B. low exhaust valve lift
C. excessive cylinder cooling
D. insufficient mechanical clearance
[单项选择]What harmful condition can result if a diesel engine is operated at very light loads for long periods of time?（）
A. increased carbon buildup
B. burning of intake valves
C. excessive firing pressures
D. increased fuel consumption
[单项选择]If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）
A. excessively late injection timing for each cylinder
B. incorrectly adjusted intake valve timing
C. incorrectly adjusted fuel injector
D. incorrectly adjusted intake valve clearance
[单项选择]Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）
A. decrease the time required between cleanings
B. removes all large and small foreign objects
C. ensure a positive flow of oil at all times
D. ensure that all lube oil has been treated twice
[单项选择]The breaking-up of fuel as it enters a diesel engine cylinder is known as（）
A. airification
B. vaporization
C. atomization
D. gasification
[单项选择]A restricted air intake to a diesel engine may result in the engine （）.
A. failing to reach rated speed
B. knocking under maximum load
C. hunting or surging under light load
D. overspeeding and running away
[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]Intake air flow from a diesel engine turbocharger is directly proportional to engine（）
A. exhaust gas pressure
B. exhaust gas temperature
C. speed
D. load
[单项选择]Cooling the intake air supplied to a diesel engine will （）.
A. reduce mean effective pressure
B. decrease average compression pressure
C. decrease air charge density
D. increase power output
[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]An indication of a diesel engine air intake being partially clogged, is （）.
A. low firing pressure and low exhaust temperatures
B. low firing pressure and normal exhaust temperatures
C. high firing pressure and low exhaust temperatures
D. high firing pressure and high exhaust temperatures
[单项选择]A turbocharged diesel engine will have an intake manifold pressure（）
A. constantly decreasing as engine load increase
B. constantly increasing as the amount of supercharging increases
C. approximately equal to exhaust manifold pressure at all times
D. approximately equal to atmospheric pressure at all times
[单项选择]Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.
A. improving cylinder scavenging
B. preheating the combustion chamber
C. reducing air charge density
D. preventing valve wear
