更多"On the all-purpose nozzle，the posit"的相关试题:
[单项选择]A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
A. posted with instruction on the operation of the systm
B. ventilated and equipped with explosion-proof switches
C. painted with red and black diagonal stripes
D. equipped with a battery powered source of emergency lighting
[单项选择]When starting a reciprocating pump, the inlet valve should be （）.
A. closed
B. opened fully
C. cracked open
D. partly open
[单项选择]The period when both inlet valves and exhaust valves are open is referred to as （）.
A. valve loop
B. valve uniflow
C. valve overlap
D. valve grinding
[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 pressure-vacuum relief valves? （）
A. Regulation of discharge pressure from cargo pumps
B. Maintaining constant velocity in cargo lines
C. Regulation of suction head on cargo pumps
D. To maintain a tank or void at atmospheric pressure
[单项选择]In an ordinary four-stroke engine the exhaust valves open （）
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[单项选择]In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.
A. downwards；upwards
B. upwards；downwards
C. downwards；downwards
D. upwards；upwards
[单项选择]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 globe
B. The valve seat is set into the bulbous body
C. The plug or disc of the valve is made vertical to the axis of the pipe
D. The valve seat is located at right side of the plug or disc
[单项选择]A defective injector nozzle in a propulsion diesel engine can cause（）
A. engine power losses
B. smoking due to unburned fuel
C. high exhaust temperature readings
D. all of the above
[单项选择]
When does auxiliary burner of rotary nozzle incinerator begin to work? （）
Ⅰ.hen igniting
Ⅱ.he sludge for dealing with is too much
Ⅲ.efore stopping incinerator
A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ
[单项选择]A fire hose with a nozzle attached must be connected to each hydrant except when exposed to heavy weather or when the（）.
A. fire hose might be damaged by cargo operations
B. vessel is in port
C. fire-main system is not charged
D. fire pumps are used for purposes other than supplying water to the fire main
[单项选择]When a fuel injection nozzle overheats, which of the problems listed can be expected?（）
A. The fuel metering will vary
B. The fuel will explode
C. The cylinder head will crack
D. The engine will stop
[单项选择]Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）
A. high firing pressure
B. overload of that particular cylinder
C. smoky exhaust
D. cooling water temperature rise
[单项选择]A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) （）.
A. dead-reckoning position
B. running fix
C. estimated position
D. fix
[单项选择]A combination or all-purpose nozzle produces（）.
A. low-velocity fog only
B. a solid stream only
C. a solid stream and foam
D. a solid stream and fog
[单项选择]One advantage of the all-purpose nozzle is that it（）.
A. can fit any size hose
B. converts a stream of water into a fog
C. increases the amount of water reaching the fire
D. can spray two streams of water at the same time
[单项选择]The nozzle of a gasoline hose or can should be kept（）.
A. in contact with the fill opening to guard against static spark
B. from making contact with the fill opening to guard against static spark
C. in contact with the fill opening to allow proper venting
D. None of the above
[单项选择]A Kort nozzle is a(n)（）.
A. hollow tube surrounding the propeller used to improve thrust
B. nozzle attached to a firefighting hose
C. intake valve on a diesel engine
D. piston cylinder on a diesel engine
