海船船员考试
单选题In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.A the beveled edges of the intake valves provide for serf-centering during seatingB intake valves utilize stellite-coated valve seat ins
题目
the beveled edges of the intake valves provide for serf-centering during seating
intake valves utilize stellite-coated valve seat inserts which reduce wear
the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
intake valves are less affected to the corrosive action of exhaust gases
相似问题和答案
第1题：
after TDC
before TDC
after BDC
before BDC
第2题：
after TDC
before TDC
after BDC
before BDC
第3题：
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.
A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure
第4题：
before TDC and close after BDC
after TDC and close after BDC
before TDC and close before BDC
after TDC and close before BDC
第5题：
the inlet valve is open
the exhaust valve is open
both valves are close
both valves are open
第6题：
cylinders
exhaust valves
pistons
fuel valves
第7题：
blows out the exhaust gases
supplies oxygen for combustion
cools the valves and cylinder walls
all of the above
第8题：
Fuel is admitted to a diesel engine cylinder through the ______.
A.injector nozzles
B.carburetor
C.exhaust ports
D.intake valves
第9题：
the inlet valve is open
the exhaust valve is open
both valves are closed
both valves are open
第10题：
Ⅰonly
Ⅱonly
bothⅠand Ⅱ
neitherⅠnor Ⅱ