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
Most solenoid valves are actuated by （）.
A
a spring
B
an electromagnet
C
the force of gravity
D
refrigerant pressure
参考答案
参考解析
解析：
暂无解析
更多 “单选题Most solenoid valves are actuated by （）.A a springB an electromagnetC the force of gravityD refrigerant pressure” 相关考题
考题
The refrigeration system low pressure cutout switch is actuated by______.A.an electric system managerB.a sensing bulb at the tail coil of the evaporatorC.pressure changes in the suction lineD.failure of the king solenoid valve
考题
4 sanitary storm valves to be dismantled，cleaned，grounded and coated with anti-corrosive paint，then refitted in order．This sentence is most possibly found in ________．A.Chief Mate's remark on stowage planB.Store list made by Chief EngineerC.Collision Report made by MasterD.Repair List
考题
Valves on steam-smothering lines to cargo tanks shall be set with ______．A.The master control valve shut and valves to individual cargo tanks shutB.The master control valve open and valves to individual cargo tanks shutC.The master control valve shut and valves to individual cargo tanks openD.All valves open
考题
丙烷机控制时间限设定值菜单（）功能是不允许加/减载电磁阀得电加载的时间长度。A、CAPACITY INCREASE SOLENOID OFF TIMERB、CAPACITY DECREASE SOLENOID ON TIMERC、CAPACITY DECREASE SOLENOID OFF TIMERD、SLIDE VALVE RETURN AT SHUTDOWN TIMER
考题
丙烷机控制时间限设定值菜单（）功能是在自动加/减载模式下，如果需要降低丙烷机的负载，加/减载电磁阀将会在定时器的时间长度内对丙烷机进行减载。A、CAPACITY INCREASE SOLENOID OFF TIMERB、CAPACITY DECREASE SOLENOID ON TIMERC、CAPACITY DECREASE SOLENOID OFF TIMERD、SLIDE VALVE RETURN AT SHUTDOWN TIMER
考题
（EMB145）为什么在飞行中，油门杆不能设置reverse（反推）位（）A、因为idle lock solenoid（慢车锁电磁活门）是通电衔接的B、因为idle lock solenoid（慢车锁电磁活门）是断电的C、只有一个油门杆idle lock solenoid（慢车锁电磁活门）锁定
考题
单选题The refrigeration system low pressure cutout switch is actuated by （）.A
an electric system managerB
a sensing bulb at the tail coil of the evaporatorC
pressure changes in the suction lineD
failure of the king solenoid valve
考题
单选题Most hydraulic steering gears are fitted with relief valves which（）A
function when the rudder is amidshipsB
relieve excess whip pressure from the hydraulic oil systemC
protect the piping assembly from external rudder shockD
relieve excessive telemotor pressure
考题
单选题The over-speed trip device installed in some diesel engines is automatically actuated by（）A
spring forceB
hydraulic pressureC
centrifugal forceD
mechanical linkage
考题
单选题In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.A
open and individual tank valves openB
open and the individual tank valves closedC
closed and the individual tank valves closedD
closed and the individual tank valves open
考题
单选题What separate the high pressure side from the low pressure side in a refrigeration system?（）A
Condenser and thermal expansion valveB
King and solenoid valvesC
Compressor and thermal expansion valveD
Condenser and solenoid valve
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Diesel engine valve springs function to （）A
hold the valves openB
keep the valves off their seats until the exhaust stroke is completedC
close the valvesD
open inlet valves when the air injection cycle begins
考题
单选题Oily water separator mis-alarms, the most possible reason is （）A
separating oil too fastB
the sensor flushed badlyC
the discharge solenoid value out of orderD
too low heating temperature
考题
单选题The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.A
fuel valves of main engineB
injector pump of main engineC
safety valves of marine boilerD
safety valves of a reciprocating pump
考题
单选题On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.A
hydraulicB
electricC
steamD
diesel
考题
单选题In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?（）A
The solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloadedB
The solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be openedC
When the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unloadD
The solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder
考题
单选题In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.A
the beveled edges of the intake valves provide for serf-centering during seatingB
intake valves utilize stellite-coated valve seat inserts which reduce wearC
the volume of air passing through intake valves is less than the volume of air passing through exhaust valvesD
intake valves are less affected to the corrosive action of exhaust gases
考题
单选题Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）A
The expansion tank should be topped offB
The thermostatic water regulating valves should be manually openedC
The fuel filters should be changedD
The engine should be turned over slowly with the indicator cocks open
考题
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）A
one valve seats upwards, while the other seats downwardsB
the reed valves used on the discharge are made substantially thicker and heavier than the suction valvesC
the suction valve springs exert a greater tension than the discharge valve springsD
the discharge valve springs exert a greater tension than the suction valve springs
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Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）A
The condenser and the expansion valveB
The king valve and the solenoid valveC
The compressor and the expansion valveD
The condenser and the solenoid valve
考题
单选题In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.A
open and individual tank valves openB
open and the individual tank valves closedC
closed and the individual tank valves closedD
closed and the individual tank valves open
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