更多"Diesel engine mufflers accomplish n"的相关试题:
[单项选择]Diesel engine exhaust noise can be reduced in an exhaust muffler by （）
A. changing the direction of exhaust gas flow
B. increasing the exhaust gas velocity
C. changing the exhaust gas weight
D. increasing the exhaust gas static pressure
[单项选择]Diesel engine mufflers or silencers reduce the engine exhaust noise by （）
A. passing the exhaust through long head pipes
B. diffusing exhaust vibrations through activated carbon baffles
C. increasing the exhaust gas velocity
D. reducing the exhaust gas velocity
[单项选择]Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A. low oil pressure
B. high coolant pressure
C. leaking fuel injector
D. cracked cylinder head or liner
[单项选择]The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.
A. principle
B. principal
C. cause
D. case
[单项选择]A diesel engine is similar to a gasoline engine except that the former has no （）.
A. cross-head
B. cylinder
C. connecting rod
D. spark plug
[单项选择]Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A. operated manually once an hour
B. operated until the engine has started
C. placed into operation only at maximum load
D. adjustable to meet lubrication requirements
[单项选择]A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.
A. as much fuel as
B. less fuel than
C. less fuel as
D. more fuel than
[单项选择]Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A. open the bypass line
B. cut in the lube oil cooler
C. pressurize the lube oil system
D. top off the expansion tank
[单项选择]Diesel engine fuel oil contamination often results in （）
A. governor malfunctions
B. fuel injection system malfunctions
C. high cylinder lube oil temperatures
D. low intake temperatures
[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
[单项选择]High diesel engine cooling water temperatures can be caused by （）.
A. air in the cooling system
B. an overhauled water pump
C. correct amount of coolant
D. no air in the cooling system
[单项选择]Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）
A. Splash
B. Gravity
C. Pressure
D. Bypass
[单项选择]The satisfactory operation of diesel engine exhaust valves usually depends on（）
A. the proper back pressure
B. the cooling water temperature
C. correct timing and proper seating
D. accurate metering and the exhaust temperature
[单项选择]Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）
A. higher speed required
B. flywheel-effect
C. lower starting temperatures
D. higher compression pressures
[单项选择]The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to （） the acid conditions.
A. invade
B. provide
C. detergent
D. neutralize
[单项选择]Theoretical perfect combustion in a diesel engine yields by-products of （）.
A. aldehydes and carbon dioxide
B. water vapor and carbon monoxide
C. nitrogen and carbon monoxide
D. water vapor and carbon dioxide
[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
[单项选择]Turbocharging of marine diesel engine is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
A. respectable
B. respectful
C. respective
D. respectively
[单项选择]Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability.Which of the key points would only require an alarm sensor?（）
A. Lube oil pressure and temperature
B. jacket water pressure and temperature
C. Engine over-speed
D. Lube oil sump level
