海船船员考试
单选题A built-up exhaust valve is one in which （）.A the stem and heads are made of different materialB low-alloy steel is used throughoutC a replaceable valve disk is welded to the headD the self-centering action comes from motion of the valve stem in the gu
题目
the stem and heads are made of different material
low-alloy steel is used throughout
a replaceable valve disk is welded to the head
the self-centering action comes from motion of the valve stem in the guide
相似问题和答案
第1题：
the inlet valve is open
the exhaust valve is open
both valves are close
both valves are open
第2题：
Worn intake valve guides
Pitted pre-combustion chambers
Loose valve tappets
High exhaust back pressure
第3题：
One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the_______.
A.governor sensitivity
B.exhaust temperature
C.fuel injection pressure
D.speed of the cam shaft
第4题：
burned exhaust valves
excessive spring compression
spring surge
worn valve seats
第5题：
Return-flow
Uniflow
Cross-flow
Direct flow
第6题：
the inlet valve is open
the exhaust valve is open
both valves are closed
both valves are open
第7题：
the direct acting relief valve is used for controlling lower flows and pressure
the pilot operated relief valve is used for controlling higher flows and pressure
the pilot operated relief valve is used for controlling lower flows and pressure
the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve
第8题：
Open the intake valve to an adjacent tank
Set out drip pans and sawdust and begin to mop up the spill
Signal the shore control point to shutdown
Close the valve on the tank vent line
第9题：
Loss of compression for that cylinder
Misfiring or rough running
Damage to the valve
All of the above
第10题：
later and closing earlier
later and closing later
earlier and closing earlier
earlier and closing later