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单选题
Unlike the globe valve, gate valves give full bore flow without change of direction, such a valve is not suitable to partially open operationAccording to the above sentence, which of the following statements is not true?（）
A
The globe valve may be suitable for partially open operation
B
The globe valve will give full bore flow with change of direction
C
The gate valve gives full bore flow with change of direction
D
The gate valve is suitable for full bore operation only
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更多 “单选题Unlike the globe valve, gate valves give full bore flow without change of direction, such a valve is not suitable to partially open operationAccording to the above sentence, which of the following statements is not true?（）A The globe valve may be suitable for partially open operationB The globe valve will give full bore flow with change of directionC The gate valve gives full bore flow with change of directionD The gate valve is suitable for full bore operation only” 相关考题
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The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?A.The profile of the valve is like a globeB.The valve seat is set into the bulbous bodyC.The plug or disc of the valve is made vertical to the axis of the pipeD.The valve seat is located at right side of the plug or disc
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The valve on the discharge side of a cargo pump on a tank vessel will usually be a ______.A.butterfly valveB.spectacle valveC.check valveD.globe valve
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
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In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open ________．A.Globe valveB.Butterfly valveC.Gate valveD.Packless valve
考题
What is an advantage of a gate valve over a butterfly valve ________．A.Less frequent maintenanceB.Faster operationC.CheaperD.More compact
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It is usually unnecessary，and indeed often impossible，______every printed clause．A.to give rise toB.giving give rise toC.given give full effect toD.to give full effect to
考题
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.A
ram relief valves bypass oil to stop rudder movementB
six-way valve shifts to the neutral flow positionC
steering pump electric motor is de - energized by the transfer switchD
follow-up gear takes the hydraulic pump off stroke
考题
单选题The period of valve overlap is when （）.A
the inlet valve is openB
the exhaust valve is openC
both valves are closeD
both valves are open
考题
单选题Valve overlap is the period during which （）.A
the inlet valve is openB
the exhaust valve is openC
both valves are closedD
both valves are open
考题
单选题Which of the valves listed should be used either in the fully opened or the fully closed position?（）A
A gate valveB
A globe valveC
Any check valveD
Any needle valve
考题
单选题What type of valve is used to direct the flow of hydraulic fluid?（）A
Relief valveB
Direction control valveC
Stop valveD
Pressure control valve
考题
单选题Which of the following statements concerning butterfly valves is correct?（）A
Special tools are required for lapping or grindingB
It is impossible to throttle flow with a butterfly valveC
To close the valve, it is only necessary to turn the handle a quarter of a turnD
The butterfly valve should never be used in a freshwater system
考题
单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）A
Holding the valve open for a long periodB
Increasing the starting air pressure usedC
Opening the stating air valve quicklyD
Reducing the starting air valve size
考题
单选题In a full flow type lube oil system, the bypass relief valve will lift due to （）A
a clogged filter elementB
excessive lube oil pump discharge pressureC
excessive lube oil flowD
excessively hot lube oil
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A gate valve installed in a pipeline should be （）.A
used in either the fully dosed or fully opened positionB
installed with the stem downC
used for steam service onlyD
used to throttle or regulate the flow of liquid
考题
单选题The valve which is most suited for regulating the flow through a pipeline is a （）A
gate valveB
globe valveC
swing-check valveD
plug-cock valve
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Starting air valves are held firmly on their seats by（）A
cam rollers on the camshaftB
spring forceC
air pressure on top of the valve differential pistonD
air pressure on the bottom of the valve differential piston
考题
单选题To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, （） is fitted.A
a check valveB
a gate valveC
a pressure reducing valveD
a quick closing valve
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Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surfaceAccording to the above sentence, which of the following statements is not true?（）A
Flows of fluids can be restricted by both cocks and valvesB
There are seats in the internal passages of valvesC
A disc of valve only moves up and downD
We can infer that there is a bore in cock ping
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The timing of diesel engine air starting valves is controlled by（）A
the air start valve timing gears and rodsB
a cylinder check valveC
individual cams and valve gearD
an air manifold poppet valve
考题
单选题While on watch in the engine room, you hear a continuous sounding of the general alarmWhich of the following actions should you take FIRST?（）A
Secure the burners then proceed to your assigned boat stationB
Start the fire pump and establish flow to the fire mainC
Open the guardian valve and standby to maneuverD
Open the master control valves on the fixed CO2 system
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