海船船员考试
单选题The safety valves are mounted in pairs to （） the boiler against overpressure.A useB releaseC protectD effect
题目
use
release
protect
effect
参考答案和解析
相似问题和答案
第1题：
______ play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.
A.Motors
B.Check valves
C.Safety valves
D.Reducing valves
第2题：
completed
carried out
cleaned
steamed
第3题：
Some cranes are mounted in pairs on a common platform. which can be rotated through_____.
A.360o
B.270o
C.180o
D.90o
第4题：
The safety valve escape piping should be disconnected from the valve body and a blank inserted
The boiler vent valves should be opened
All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks
All of the above
第5题：
relieve excess fuel oil pressure during the “off” fire cycle
admit water to the dry pipe
throttle the forced draft fan output for proper combustion
reduce excess steam pressure in the boiler
第6题：
Electrical cut off switch
A fusible link
Manual cut off switch
A water spray actuator
第7题：
descriptions
discrepancies
different
deflections
第8题：
The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler ______.
A.steam demand is high
B.salinity is high
C.safety valve simmers(爆发)
D.burner flame is extinguished
第9题：
use
release
protect
effect
第10题：
The safety valve escape piping should be disconnected from the valve body and a blank inserted
The boiler vent valves should be opened
All handhole/manhole covers should be tightened up as much as possible to preclude any leaks
All of the above