更多"A swing check valve is used in a pi"的相关试题:
[单项选择]The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
A. assist in a quick cutoff of fuel injection
B. allow oil backflow from the injector to the helix
C. reduce fuel oil pressure between injection strokes
D. meter the quantity of fuel delivered
[单项选择]A solenoid valve used in a refrigeration system should be installed （）.
A. with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valve
B. upright, sensing temperature of the box, and upstream of the thermal expansion valve
C. upright, sensing temperature of the box, and downstream of the thermal expansion valve
D. upright, sensing heat of the tail coil, and upstream of the thermal expansion valve
[单项选择]A check valve is another name for （）.
A. a test valve
B. an inspection valve
C. a stop valve
D. a non-return valve
[单项选择]An orifice-check valve placed in a hydraulic system is used to（）
A. regulate the fluid flow in either direction
B. restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction
C. allow free movement of hydraulic fluid in both directions
D. allow a restricted fluid flow in one direction only
[单项选择]Overflow valve is used to （）
A. control the fluid flow through it
B. prevent the pressure before it over the specified valve
C. make the pressure after it steady
D. control the direction of oil flow
[单项选择]What type of valve is used to direct the flow of hydraulic fluid?（）
A. Relief valve
B. Direction control valve
C. Stop valve
D. Pressure control valve
[单项选择]A gate valve installed in a pipeline should be （）.
A. used in either the fully dosed or fully opened position
B. installed with the stem down
C. used for steam service only
D. used to throttle or regulate the flow of liquid
[单项选择]Valve cages are used on some large diesel engines to （）
A. reduce wear on the valve stem
B. permit the use of alloy valve seat materials
C. reduce heat transfer from the valve seat
D. facilitate valve removal for servicing
[单项选择]Check value is used to control （）
A. direction of oil flow
B. back pressure of return oil
C. bypass of filter
D. high pressure overflow
[单项选择]Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.
A. control the back pressure of return oil
B. lock the oil lines under some conditions
C. change the direction of oil flow
D. act as relief valve
[单项选择]（）means check the swing of the vessel’s head in a turn.
A. Steady
B. Meet her
C. Midships
D. Stop engines
[单项选择]Tools with （）handles should be used to check electric circuit.
A. plastic
B. metal
C. stainless steel
D. copper
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A. be jammed
B. be opened
C. be seated
D. be broken
[判断题]Swing界面一般都会有一个顶级Swing容器，但特殊情况下也可以没有。
[单项选择]A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.
A. blind flange
B. pivot coupling
C. quick-release coupling
D. spectacle flange
[单项选择]A vessel servicing a pipeline during the day shall display（）.
A. three black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamond
B. three shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamond
C. three black balls in a vertical line
D. two black balls in a vertical line
[单项选择]LFG tank and pipeline maintenance should include（）.
A. exclusion of all sand and solid matter
B. cleaning with clean fresh or sea water
C. examination for fractures and pitting
D. All of the above
