更多"The purpose of the delivery check v"的相关试题:
[单项选择]A swing check valve is used in a pipeline to （）.
A. maintain a preset pressure on the line
B. closely regulate the amount of flow
C. relieve excessive pressure on the line
D. allow flow in one direction only
[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]The primary function of a fuel delivery check valve assembly is to（）
A. deliver proper fuel quantity to the injection nozzle
B. provide rapid fuel injection cutoff
C. control fuel quantity entering the pump body
D. control fuel pressure delivered to the combustion chamber
[单项选择]What is the purpose of a relief valve?（）
A. to fill 2 tanks at the same time
B. to use pump at a higher pressure
C. to return liquid to suction side if discharge valve is closed
D. All of the above are true
[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]The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）
A. remove any air that may accumulate in the system
B. take out unpleasant fumes from the refrigerant
C. vent off excess refrigerant in an emergency
D. permit opening the refrigerating system for cleaning and inspecting
[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]Water fog from an all-purpose nozzle may be used to（）.
A. fight an electrical fire
B. fight a magnesium fire
C. eliminate smoke from a compartment
D. All of the above
[单项选择]The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）
A. compensate for low oil level
B. increase governor promptness
C. prevent governor hunting
D. limit engine load
[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]The purpose of the wearing rings used in a centrifugal pump is to （）.
A. prevent an internal explosion in the pump when it is overheated
B. enable a visual inspection of the pump while it is running
C. insure a proper alignment of the pump coupling to the driver
D. accommodate for friction between the impeller and the easing
[单项选择]A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.
A. the low inertia
B. the high inertia
C. the low velocity
D. the high velocity
[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]The purpose of a preventer as it is used on a conventional yard and stay cargo rig is to（）.
A. allow greater than normal loads to be handled by the gear
B. act as an inboard guy in the event the inboard guy parts during cargo handling
C. assist the outboard guy in supporting stresses during cargo handling
D. prevent the inboard guy from parting due to stresses during cargo handling
[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
