海船船员考试
单选题A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.A a pressure reducing valveB a pilot valveC an
题目
a pressure reducing valve
a pilot valve
an operating piston
downstream pressure
相似问题和答案
第1题：
If the head pressure of a reciprocating refrigeration compressor is excessive
A.the relief valve should open before the high pressure cutout
B.the relief valve should open and allow the excess refrigerant to flow to the receiver
C.the high pressure cutout switch should operate before the relief valve opens
D.you should close the discharging valve
第2题：
Relief valves
Check valves
Safety valves
Reducing valve
第3题：
Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?
A.Pressure-reducing valve
B.Unloading valve
C.Counterbalance valve
D.Pressure-relief valve
第4题：
separating chamber
system of baffles
purge valve
vacuum reducing valve
第5题：
having a shorter duration of opening
having a longer duration of opening
closing sooner
opening later
第6题：
Pressure-reducing valve
Unloading valve
Counterbalance valve
Pressure-relief valve
第7题：
be jammed
be opened
be seated
be broken
第8题：
A.systematic
B. expensive
C. speculative
D. sophisticated
第9题：
compressor；condenser
condenser；evaporator
throttle valve；evaporator
evaporator；condenser
第10题：
is a finer，more diffuse water spray than low-velocity fog
requires that the water pressure be no greater than 60 psi
produces an effective fog pattern no more than 6 feet beyond the nozzle
extinguishes a fire by absorbing heat and reducing the supply of oxygen