更多"The purpose of the wearing rings us"的相关试题:
[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 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]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]Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）
A. increase the liner area covered by the oil film
B. maintain an oil film on the lower liner where scuffing is prevalent
C. keep excess oil away from intake and exhaust ports
D. help cushion piston skirt side thrust by providing a hydrodynamic oil wedge
[单项选择]Water fog from an all-purpose nozzle may be used to（）.
A. fight an electrical fire
B. fight a magnesium fire
C. eliminate smoke from a compartment
D. All of the above
[单项选择]What is the function of wearing rings found on some centrifugal pumps? （）
A. Absorb erosion of high velocity discharge stream
B. Seal pump shaft against entry of air
C. Isolate the outlet side from the inlet side
D. Dampen the turbulent discharge flow
[单项选择]One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.
A. maintain radial alignment between the pump impeller and casing
B. absorb all impeller shaft end thrust
C. prevent water leakage to the atmosphere
D. prevent wear of the pump casing and/or impeller
[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]The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）
A. compensate for low oil level
B. increase governor promptness
C. prevent governor hunting
D. limit engine load
[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 purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
A. assist in a quick cutoff of fuel injection
B. allow oil backflow from the injector to the helix
C. reduce fuel oil pressure between injection strokes
D. meter the quantity of fuel delivered
[单项选择]The purpose of a preventer as it is used on a conventional yard and stay cargo rig is to（）.
A. allow greater than normal loads to be handled by the gear
B. act as an inboard guy in the event the inboard guy parts during cargo handling
C. assist the outboard guy in supporting stresses during cargo handling
D. prevent the inboard guy from parting due to stresses during cargo handling
[名词解释]General purpose registers
[单项选择]Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
A. starting the engine while hot
B. knurling the piston skirt
C. operating the engine overheated
D. scuff resistant piston rings
[单项选择]Broken piston rings manifest themselves during the scavenge port inspection by（）
A. Lack of elastic tension, when the rings are pressed into the groove by means of a stick
B. Blackish appearance
C. Fractured rings and missing rings
D. all off the above
[单项选择]The main function of piston compression rings is to （）
A. prevent excessive cylinder liner wear
B. reduce friction losses in the engine
C. seal the space between the piston and the liner
D. limit upward flow of lube oil into the combustion space
[单项选择]The piston rings are manufactured with a diameter （） the bore of the cylinder.
A. larger than
B. smaller than
C. equal to
D. none of the above
