更多"The top piston ring is plasma coate"的相关试题:
[单项选择]Top piston rings are plasma coatedIt gives added safety for the of new lines（）
A. running-in
B. running-out
C. running on
D. running down
[单项选择]Ring groove inserts are occasionally used on aluminum alloy piston to（）
A. reduce the ring groove wear rate
B. seal against crankcase vapors
C. lessen the wear on aluminum part of the cylinder
D. allow for the greater expansion rate of aluminum
[单项选择]The control spindle operates the slipper ring or （） of the variable delivery pump, which controls the suction and discharge of the oil.
A. servo-motor
B. swash plate
C. plunger
D. cylinder
[单项选择]The （）has a water damp ring.
A. purifier
B. oil/water separator
C. incinerator
D. distiller
[单项选择]Black areas on the sealing surfaces of piston rings indicate（）
A. lube oil pumping
B. rotating rings
C. gas pressure behind the ring
D. passage of hot gases
[单项选择]The piston ring grooves for a standard engine are （）
A. chromium-plate against wear
B. anti-corrosion treated
C. white metal lined against wear
D. flame hardened against wear
[单项选择]Which information does the outer ring of a compass rose on a nautical chart provide（）.
A. variation
B. true directions
C. magnetic directions
D. annual rate of variation change
[单项选择]If the piston ring gap remains insufficient when installing new rings, youshould（）
A. install oversized rings
B. hone the cylinder liner to allow ring installation
C. compress the rings tighter with a compressing tool
D. file the ends of the rings
[单项选择]There is a support ring between the cylinder block and collar of the cylinder liner, thus carrying both the liner and the cylinder coverIt also passes to the cooling bores and to the cover（）
A. cooling water
B. cooling oil
C. refrigerant
D. lubricate oil
[单项选择]Excessive piston ring wear in a diesel engine will cause（）
A. high lube oil viscosity
B. increased lube oil consumption
C. low lube oil temperatures
D. high firing pressures
[单项选择]For any piston ring to operate smoothly without scuffing ,the ring must be （）.
A. of a material harder than the cylinder liner
B. properly lubricated
C. prevented from compressing
D. prevented from rotating during engine operation
[单项选择]The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.
A. upwards；inwards
B. upwards；outwards
C. downwards；inwards
D. downwards；outwards
[单项选择]Calibration Stations give special transmissions for the calibration of ship’s（）.
A. gyro-compass
B. marine radar
C. DF
D. navigational satellite
[单项选择]EMU盘RING OFF按键开关作用是（）
A. 关掉告警声
B. 使网管盘复位
C. 切换主备EMU
D. 查询DCC通信状态
[单项选择]Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）
A. To allow for greater expansion due to higher operating temperature
B. To seal the cylinder against leakage of combustion gases
C. To provide an additional surface for oil cooling
D. To provide an additional strength for the crown and lower structure
[单项选择]A diesel engine piston ring face is in direct contact with the （）.
A. top of the ring groove
B. cylinder liner oil film
C. bottom of the ring groove
D. back of the ring groove
[单项选择]（）the moveable plate and floating ring inside the pump is very difficult.
A. Having adjusted
B. Being adjusted
C. To adjust
D. Adjusted
[单项选择]Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?（）
A. The viscosity off the fuel
B. The quantity of water to be removed from the fuel
C. The specific gravity of the fuel
D. The quantity of dirt to be removed from the fuel
[单项选择]The lowest ring of a piston is （）.
A. a coil spring
B. a sealing ring
C. an oil distributor ring
D. main seal ring
