海船船员考试
单选题The satisfactory operation of diesel engine exhaust valves usually depends on（）A the proper back pressureB the cooling water temperatureC correct timing and proper seatingD accurate metering and the exhaust temperature
题目
the proper back pressure
the cooling water temperature
correct timing and proper seating
accurate metering and the exhaust temperature
相似问题和答案
第1题：
Fuel is admitted to a diesel engine cylinder through the ______.
A.injector nozzles
B.carburetor
C.exhaust ports
D.intake valves
第2题：
after TDC
before TDC
after BDC
before BDC
第3题：
A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke
A.①
B.②
C.① and ②
D.Neither ① nor ② is correct
第4题：
Ⅰonly
Ⅱonly
bothⅠand Ⅱ
neitherⅠnor Ⅱ
第5题：
cylinders
exhaust valves
pistons
fuel valves
第6题：
During the valve overlap period, the exhaust pressure of a turbocharged four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure ______.
A.effective cylinder scavenging and cooling
B.constant pressure from the turbochargers
C.cooler operation of the exhaust system
D.effective constant pressure for turbocharger operation
第7题：
principle
principal
cause
case
第8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9题：
blows out the exhaust gases
supplies oxygen for combustion
cools the valves and cylinder walls
all of the above
第10题：
passing the exhaust through long head pipes
diffusing exhaust vibrations through activated carbon baffles
increasing the exhaust gas velocity
reducing the exhaust gas velocity