更多"When inspecting piston rings throug"的相关试题:
[单项选择]
In a diesel engine, when refitting piston rings you should （）
Ⅰ.check the ring gap at the smallest diameter of the cylinder
Ⅱ. Remove carbon from the ring groove
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ nor Ⅱ
[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 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]Improperly fitted piston rings in a diesel engine can cause（）
A. excessive lube oil consumption
B. lower than normal lube oil temperature
C. higher than normal exhaust back pressure
D. excessive crankshaft end play
[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]These piston rings are so badly worn that they must be （）.
A. renewed
B. welded
C. machined
D. chromium-plated
[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]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 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]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]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]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]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]Among the rings of a piston the （） one is subjected to the greatest load and temperature.
A. bottom
B. middle
C. top
D. none of the above
[单项选择]A piston is at bottom dead center when it is（）
A. opening the exhaust ports
B. closing the fuel ports
C. farthest from the cylinder head
D. nearest to the cylinder head
[单项选择]
In a diesel engine, when installing new piston rings it is important to check（）
Ⅰ.ring gap clearance
Ⅱ.side clearance
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰnor Ⅱ
[单项选择]On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.
A. thrust block
B. sounding rod
C. connecting rod
D. push rod
[单项选择]A piston is said to be at top dead center when it is （）
A. opening the exhaust ports
B. placed on top of the engine along its centerline
C. farthest from the cylinder head
D. nearest to the cylinder head
