micro-seizure
sticking
scratched
breakage/ollapse
第1题：
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
第2题：
is coming upward；cylinder ring belt
is going downward；piston ring belt
is coming upward；piston ring belt
is going downward；cylinder ring belt
第3题：
Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?
A.Control the amount of lube oil burned in the combustion chamber
B.Transmit heat from the piston to the cylinder liner
C.Prevent damage to ring groove inserts by acting as a heat dam
D.Dissipate combustion chamber gas pressure by channeling it through the ring gap
第4题：
Ⅰonly
Ⅱ only
both Ⅰ and Ⅱ
neither Ⅰ nor Ⅱ
第5题：
top of the ring groove
cylinder liner oil film
bottom of the ring groove
back of the ring groove
第6题：
a coil spring
a sealing ring
an oil distributor ring
main seal ring
第7题：
should be scraped
should be derusted
should be drilled out
to be brushed off
第8题：
In a diesel engine, when refitting piston rings you should ①check the ring gap at the smallest diameter of the cylinder ②remove carbon from the ring groove
A.①
B.②
C.①②
D.neither ① nor ②
第9题：
Ⅰ only
Ⅱ only
both Ⅰ and Ⅱ
neither Ⅰ nor Ⅱ
第10题：
low compression pressure
increased piston wear
increased cylinder lube oil consumption
poor contact between compression rings and liner