更多"Oil control rings used in two-strok"的相关试题:
[单项选择]To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.
A. prevent any lubricant from reaching
B. prevent excessive lubrication from reaching the combustion space
C. Provide metal-to-metal contact to seal the cylinder against blow-by
D. assure a positive means of scraping carbon accumulation from the cylinder
[单项选择]The function of the piston compression rings used in a diesel engine is to （）
A. seal the space between the piston and liner
B. transmit heat from the piston to the cylinder liner
C. reduce the amount of combustion gas blow-by
D. all of the above
[单项选择]Piston compression rings used in a diesel engine function to （）
A. transfer heat from the cylinder to the piston
B. scrape oil from the sides of the piston
C. seal the combustion space from the crankcases
D. prevent any piston contact with the cylinder liner
[单项选择]The purpose of the wearing rings used in a centrifugal pump is to （）.
A. prevent an internal explosion in the pump when it is overheated
B. enable a visual inspection of the pump while it is running
C. insure a proper alignment of the pump coupling to the driver
D. accommodate for friction between the impeller and the easing
[单项选择]In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.
A. a service tank
B. a settling tank
C. an expansion tank
D. a double bottom tank
[单项选择]What is a function of the wearing rings used in most centrifugal pumps?（）
A. Absorb erosion of high velocity discharge stream
B. Seal pump shaft against entry of air
C. Isolate the discharge side from the suction side
D. Dampen the turbulent discharge flow
[单项选择]The term OIL as used in the Oil Pollution Regulations means（）.
A. fuel oil
B. sludge
C. oil refuse
D. All of the above
[单项选择]Load control on a diesel engine is accomplished by （）.
A. regulating the speed of the turbocharger
B. rotating the fuel injector pump plunger
C. regulating the speed of the fuel oil transfer pump
D. changing engine timing
[单项选择]If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）
A. changed
B. centrifuged
C. filtered
D. settled
[单项选择]If a used lube oil analysis indicates an excessive chromate content, this means （）
A. air filtration is inadequate
B. engine coolant leaking into the lube oil
C. fuel oil is leaking into the lube oil
D. the piston rings are excessively worn
[单项选择]If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）
A. corrosive deterioration of a bearing
B. inadequate air filtration
C. excessive ring and liner wear
D. excessive cooling of lubricating oil
[单项选择]
The sequence of parts in a generally used fuel oil supply system for a main engine is （）
(1)tanks in the double bottom
(2)centrifuges
(3)service tank
(4)settling tank
(5)viscosity regulator
A. (1)-(2)-(4)-(3)-(5)
B. (1)-(4)-(2)-(3)-(5)
C. (1)-(3)-(2)-(4)-(5)
D. (1)-(5)-(4)-(2)-(3)
[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
[单项选择]Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.
A. wheelhouse control station
B. engine room control station
C. captains office
D. chief engineers office
[单项选择]The main purpose of the piston oil scraper rings is to （）.
A. seal the space between the piston and the liner
B. reduce the amount of lube oil burned in the combustion chamber
C. transmit heat from the piston to the cylinder liner
D. damp out fluctuations of the piston side thrust
[单项选择]The primary purpose of oil control rings on a diesel piston is to（）
A. provide a reservoir for cylinder lubrication
B. pump oil into the combustion space for cylinder cooling
C. prevent excessive lubricating oil consumption
D. allow hydraulic oil film formation on the cylinder
[单项选择]Diesel engine control can be obtained by the bridge （）.
A. at any time
B. only after the engine room control station is switched to “bridge control”
C. whenever the secondary station is switched to "bridge control"
D. with the approval of the chief engineer only
[单项选择]Main diesel engine control can be obtained by the bridge （）
A. at any time
B. only after the engine room control station is switched to ‘bridge control’
C. whenever the secondary station is switched to ‘bridge control’
D. whenever the engine side control station is switched to ‘bridge control’
[单项选择]The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.
A. play a great part on
B. run a role in
C. plays an important part in
D. acts as important part at
