更多"The plunger may be rotated in the b"的相关试题:
[单项选择]If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）
A. only the replacement of the entire pump would be acceptable
B. the injection pump and injection nozzle must be replaced
C. either the barrel or plunger must be replaced
D. the barrel and plunger must be replaced as a unit
[单项选择]As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.
A. opened up
B. closed off
C. lined up
D. taken off
[单项选择]The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）
A. No fuel will be delivered
B. The maximum effective stroke will be attained
C. The fuel delivered to the cylinder will be excessive
D. The injection nozzle will overheat and carbonize
[单项选择]The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）
A. varying the pump discharge pressure
B. varying the pump return pressure
C. rotation of the pump plunger
D. rotation of the pump barrel
[单项选择]The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.
A. crankshaft
B. camshaft
C. piston rod
D. rack and pinion
[单项选择]The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.
A. barrel
B. ram
C. piston
D. rod
[单项选择]A common trouble with the fuel pump plunger or fuel valve spindle is （）.
A. water leakage
B. steam leakage
C. oil leakage
D. air leakage
[单项选择]As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.
A. being compressed
B. to be pumped up
C. is pressurized
D. are built up
[单项选择]Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）
A. changes the position of the fuel inlet ports
B. changes the length of the pump stroke
C. varies the quantity of fuel delivered
D. varies the compression of the delivery valve spring
[单项选择]Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is （）.
A. stored at temperatures below 60 degrees Fahrenheit
B. charged into a system having copper fittings
C. allowed to mix with compressor oil
D. exposed to an open flame or hot surface
[单项选择]（）may be laid ready for the cargo or may just be put in bundles ready for the stevedores to lay out as the cargo is loaded.
A. Wedge
B. Dunnage
C. Shore
D. Store
[单项选择]Problems may （）
A. rise
B. jump
C. arise
D. lift
[单项选择]You may（）traffic lane.
A. enter
B. enter in
C. enter to
D. enter into
[单项选择]Maritime Administration personnel may be allowed in the pilothouse upon the responsibility of the（）.
A. Chief Officer
B. Navigator
C. most senior person present from the Maritime Administration
D. officer in charge of the watch
[单项选择]（） may not justify detention.
A. significant areas of damage or corrosion
B. pitting of plating and associated stiffening in decks
C. pitting of hull affecting seaworthiness or strength to take local loads
D. the condition of such items as ladder ways，guard-rails，pipe coverings
[单项选择]Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability.Which of the key points would only require an alarm sensor?（）
A. Lube oil pressure and temperature
B. jacket water pressure and temperature
C. Engine over-speed
D. Lube oil sump level
[单项选择]In the Northern hemisphere northerly winds may cause temperature（）.
A. falling
B. rising
C. constant
D. same
[单项选择]Good anchorage may be obtained anywany, generally mud and sand, in this water area. Vessel may have（）.
A. good towing ground
B. good holding ground
C. good grabbing ground
D. good dragging ground
[单项选择]Which may ignite fuel vapors?（）
A. Static electricity
B. An open and running motor
C. Loose wiring
D. All of the above
