更多"All the rings are slightly rounded "的相关试题:
[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
[单项选择]When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）
A. insufficient lubrication
B. improper piston cooling
C. blow-by
D. overload operation
[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]If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）
A. excessive ring action
B. excessive ring temperature
C. improper ring rotation
D. excessive ring face wear
[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]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
[判断题]定义外部变量时，不用存储类说明符extern，而说明外部变量时用它。
[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 sealing rings are in four parts and pressed together around the piston rods by means of （）.
A. nuts
B. bolts
C. coil springs
D. stuffing boxes
[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]These piston rings are so badly worn that they must be （）.
A. renewed
B. welded
C. machined
D. chromium-plated
[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]When installing rings on a diesel engine piston, you should check the ring（）
A. diametrical tension
B. gap clearance
C. radial thickness
D. face thickness
[单项选择]If the phone rings again, I（）it.
A. ignore
B. will ignore
C. will have ignored
D. would have ignored
[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]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]Cast iron carrier rings, （） machined grooves, are provided for all the pistons.
A. caulked into
B. caulking into
C. pressed into
D. screwed into
[单项选择]The piston rings if found worn out （） and supplied by shipchandler.
A. must replace
B. must to be equipped
C. has to be repaired
D. have to be renewed
[单项选择]A single piece（） fitted with bronze rings guides the piston in the cylinder liner.
A. piston skirt
B. piston crown
C. guide way
D. cross-head
