The amount of fluid delivered by a gear pump can be regulated by （）.
A . throttling the pressure line
B . changing the speed of the rotor
C . either A or B
D . None of the above is true
相似题目
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Air trapped in the hydraulic fluid of a steering system may be indicated by（）
A . the steering pumps overspeeding
B . a jammed open relief vale
C . a constantly occurring improper rudder response
D . excessive ram pressure
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If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
A . add fluid that is the same color as the fluid in the reservoir
B . add turbine oil because it is always a good substitute
C . add any oil that has the same viscosity as the hydraulic fluid
D . check the winch manufacturers instruction book
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The most common contaminate of governor hydraulic fluid is （）.
A . moisture
B . dirt
C . acid
D . air
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The amount of fuel delivered by a unit injector is controlled by the （）
A . camshaft
B . main spring
C . rack position
D . nozzle orifice size
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The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）
A . Proper timing
B . Accurate metering
C . Suitable injection rate
D . Suitable atomization rate
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Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
A . 97 times greater
B . 94 times greater
C . 10 times greater
D . 2 times greater
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Air trapped in the hydraulic fluid of a steering system would be indicated by（）
A . an improper rudder response
B . hammering noises in the equipment or transmission lines
C . popping or sputtering noises
D . all the above
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The amount of fluid delivered by a screw pump can be regulated by （）.
A . throttling the pressure line
B . changing the speed of the rotor
C . either A or B
D . None of the above is tree
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The resistance to the movement of the globule in oily water mixture depends on its size and the （） of the fluid.
A . pressure
B . velocity
C . gravity
D . viscosity
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The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A . specific gravity
B . viscosity
C . S E number
D . hydrolytic stability
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The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）
A . dirt
B . fuel oil
C . governor cooling water
D . fuel oil tar
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The amount of fluid delivered by a helical pump can be regulated by （）.
A . throttling the pressure line
B . changing the speed of the rotor
C . either A or B
D . None of the above is tree
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Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）
A . Overcoming sliding friction
B . Overcoming rolling friction
C . Overcoming fluid friction
D . Overcoming oil wedge frictio
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The amount of fluid delivered by a reciprocating pump can be regulated by （）.
A . throttling the pressure line
B . changing the speed of the piston
C . either A or B
D . None of the above is tree
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The major source of chemical contaminants in hydraulic fluid is （）.
A . microscopic steel shavings
B . abrasive waste
C . anti-oxidant compounds
D . oxidation by-product
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Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.
A . fluid friction
B . fluid turbulence
C . component misalignment
D . pressure surge
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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 valve
B . Butterfly valve
C . Gate valve
D . Packless valve
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The pipe friction and the resistance will （） as a result of an increase in the amount of fluid flowing through the system.
A . reduce
B . rise
C . raise
D . fall
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（）shall the amount of compensation from PICC exceed the insured amount of the insured ship.
A . In any case
B . In case
C . In no case
D . In case of
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The amount of fluid delivered by a centrifugal pump can be regulated by （）.
A . throttling the pressure line
B . changing the speed of the rotor
C . either A or B
D . None of the above is tree
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When air becomes trapped in the hydraulic fluid of a steering system, the （）.
A . rudder will respond sluggishly
B . hydraulic rams will over-speed
C . sight glass will show bubbles
D . ram relief valves will lift
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The movement of heat within a fluid, caused by the application of thermal energy, is called （）.
A . radiation
B . conduction
C . convection
D . condo-radiatio
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The insurer is obliged to make indemnity up to the amount of ________, or up to the amount of the amount insured, or up to the amount of insurable interest.
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Which is the best explanation of the relationship between lymph, blood plasma, and interstitial fluid？
A．Blood plasma leaves blood vessels and becomes lymph surrounding cells． Cells can take in what they need and excrete wastes into this flui
D．Then the extra lymph enters lymphatic vessels and is called interstitial fluid and is returned to the blooD
B．Lymph leaves blood vessels and because blood plasma surrounding cells． Cells can take in what they need and excrete wastes into this flui
D．Then the extra blood plasma enters lymphatic vessels and is called interstitial fluid and is returned to the blooD
C．Interstitial fluid leaves blood vessels and becomes lymph surrounding cells．Cells can take in what they need and excrete wastes into this flui
D．Then the extra lymph enters lymphatic vessels and is called blood plasma and is returned to the bloo
D．Blood plasma leaves blood vessels and becomes interstitial flui
D．Cells can take in what they need and excrete wastes into this flui
D．Then the extra interstitial fluid enters lymphatic vessels and is called lymph and is returned to the bloo
D．
