网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
The safety valves are mounted in pairs to （） the boiler against overpressure.
A
use
B
release
C
protect
D
effect
参考答案
参考解析
解析：
暂无解析
更多 “单选题The safety valves are mounted in pairs to （） the boiler against overpressure.A useB releaseC protectD effect” 相关考题
考题
Some cranes are mounted in pairs on a common platform. which can be rotated through_____.A.360oB.270oC.180oD.90o
考题
The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler ______.A.steam demand is highB.salinity is highC.safety valve simmers(爆发)D.burner flame is extinguished
考题
______ play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.A.MotorsB.Check valvesC.Safety valvesD.Reducing valves
考题
单选题According to the regulations，what fire safety control feature is required in quick-closing shut off valves?（）A
Electrical cut off switchB
A fusible linkC
Manual cut off switchD
A water spray actuator
考题
单选题The safety valves should be tested and adjusted when the boiler survey is （）A
completedB
carried outC
cleanedD
steamed
考题
单选题You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.A
descriptionsB
discrepanciesC
differentD
deflections
考题
单选题The purpose of the safety relief valves installed on an auxiliary boiler is to （）.A
relieve excess fuel oil pressure during the “off” fire cycleB
admit water to the dry pipeC
throttle the forced draft fan output for proper combustionD
reduce excess steam pressure in the boiler
考题
单选题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A
The safety valve escape piping should be disconnected from the valve body and a blank insertedB
The boiler vent valves should be openedC
All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaksD
All of the above
考题
单选题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A
The safety valve escape piping should be disconnected from the valve body and a blank insertedB
The boiler vent valves should be openedC
All handhole/manhole covers should be tightened up as much as possible to preclude any leaksD
All of the above
考题
单选题Which of the following items don’t belong to dock repair works?（）A
making the repair list, booking spare parts and special tools for the dock repairB
shutting off all of the S.W valves to outboardC
the sketches or diagrams used for the dock repairD
cleaning up the oil tank and boiler before enter the dock
考题
单选题Which of the following items don’t belong to dock repair works?（）A
making the repair list, booking spare parts and special tools for the dock repairB
shutting off all of the SW valves to outboardC
the sketches or diagrams used for the dock repairD
cleaning up the oil tank and boiler before enter the dock
考题
单选题The boiler feed water check valves are located on the （）A
feed pump suction lineB
hot wellC
shell of the feed heaterD
feed lines to the boiler
考题
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）A
remove suspended and precipitated solids from the boiler waterB
completely drain the boiler in an emergency situationC
prevent hardened scale deposits in the water drumD
remove floating impurities from the oily water surface
考题
单选题Which one is not the normal operation for boiler shutdown?（）A
Carry out soot blowing if permissibleB
Change fuel supply to diesel oilC
Close steam stop valves on boiler when pressure is reducedD
Drain boiler empty when it has cooled down
考题
单选题Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）A
clean the flame scanner photocell windowB
Inspect and clean all solenoid valvesC
lift the safety valves by handD
Inspect for oil or water leaks
考题
单选题Safety valves on a boiler vent to the （）.A
fuel tankB
bilgeC
atmosphereD
auxiliary exhaust line
考题
单选题If you observe any situation which presents a safety or pollution hazard during fuel transfer operations, which of the following actions should be taken FIRST?（）A
Close the valves at the transfer manifoldB
Notify the person in charge of the shore facilityC
Shut down the transfer operationD
Sound the fire alarm
考题
单选题After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the （）.A
furnace to be re-purgedB
electric charge to buildup in the igniterC
fuel pump to restartD
drum level to stabilize
考题
单选题（） supplies pilot air to control the cylinder air start valves.A
An air compressorB
An indicator cockC
An air distributorD
A safety valve
考题
单选题（） should be tested and adjusted when the boiler survey is carried out.A
The boiler oil tankB
The steam pipeC
The fire sideD
The safety valves
考题
单选题（） are mounted in pairs to protect the boiler against overpressure.A
Safety valvesB
Water tubesC
Steam stop valvesD
Blow down valves
考题
单选题Some cranes are mounted in pairs on a common platform which can be rotated through（）.A
360°B
270°C
180°D
90°
考题
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）A
completely drain the boiler in an emergencyB
prevent sludge from forming in the drumC
remove floating impurities from the boiler water surfaceD
remove settled solids from the water drum
考题
单选题After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the （）.A
furnace to be re-purgedB
electric charge to buildup in the igniterC
fuel pump to restartD
dram level to stabilize
考题
单选题In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）A
fuel valves；exhaust valveB
exhaust valves；inlet valveC
fuel valves；inlet valveD
exhaust valves；fuel valve
考题
单选题Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.A
in boiler drumsB
in refrigerating plantsC
in starting air pipesD
in air coolers
考题
单选题Which action should be taken when an auxiliary boiler in is operation?（）A
Clean all electrical connectionsB
Lift the relief valves by handC
Inspect and clean all solenoid valvesD
Inspect for oil and water leaks
热门标签
最新试卷