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单选题
On the all-purpose nozzle，the position of the valve when the handle is all the way forward is（）.
A
shut
B
fog
C
solid stream
D
spray
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考题
One advantage of the all-purpose nozzle is that it ______.A.can fit any size hoseB.converts a stream of water into a fogC.increases the amount of water reaching the fireD.can spray two streams of water at the same time
考题
第一组Older loop scavenged engines may have a single injector mounted centrally in the cylinder head. Because the exhaust valve is in the center of the cylinder head on modern uniflow scavenged engines the fuel valves (2 or 3) are arranged around the periphery of the head. The pressure at which the injector operates can be adjusted by adjusting the loading on the spring. The pressures at which the injectors operate vary depending on the engine, but can be as high as 540 bar. Some injectors have internal cooling passages in them extending into the nozzle through which cooling water is circulated. This is to prevent overheating and burning of the nozzle tip. Injectors on modern engines do not have internal cooling passages. They are cooled by a combination of the intensive bore cooling in the cylinder head being close to the valve pockets and by the fuel which is re-circulated through the injector when the follower is on the base of the cam or when the engine is stopped. As well as cooling the injector, re-circulating the fuel when the engine is stopped keeps the fuel at the correct viscosity for injection by preventing it from cooling down. Fuel injectors must be kept in good condition to maintain optimum efficiency, and to prevent conditions arising which could lead to damage within the cylinder. Injectors should be changed in line with manufacturers recommendations, overhauled and tested. Springs can weaken with repeated operation leading to the injector opening at a lower pressure than designed. The needle valve and seat can wear which together with worn nozzle holes will lead to incorrect atomization and dribbling.Modern uniflow scavenged engines have______.A.a single injector mounted in the center of the cylinder headB.several injectors mounted around the external boundary of the cylinder headC.a single injector mounted at the external boundary of the cylinder headD.several injectors mounted in the center of the cylinder head
考题
Springs in fuel injectors will become not strong enough to work because______.A.the injector opens at a lower pressure than designedB.the needle valve and seat wear outC.the nozzle holes wear outD.long time in use
考题
When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?A.Light ListB.Notice to MarinersC.On the chartD.Coast Pilot
考题
The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to ______.A.a difference in water pressureB.the method of breaking up the water streamC.the length of the applicatorD.All of the above
考题
If a firefighting situation calls for low-velocity fog you would ______．A.order the engine room to reduce pressure on the fire pumpB.put the lever on an all-purpose fire nozzle all the way forwardC.attach a low-velocity fog applicator with the nozzle shut downD.put the lever on an all-purpose fire nozzle all the way back
考题
A Kort nozzle is a(n) ______.A.hollow tube surrounding the propeller used to improve thrustB.nozzle attached to a firefighting hoseC.intake valve on a diesel engineD.piston cylinder on a diesel engine
考题
单选题When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）A
Light ListB
Notice to MarinersC
On the chartD
Coast Pilot
考题
单选题If a firefighting situation calls for low-velocity fog you would（）.A
order the engine room to reduce pressure on the fire pumpB
put the lever on an all-purpose fire nozzle all the way forwardC
attach a low-velocity fog applicator with the nozzle shut downD
put the lever on an all-purpose fire nozzle all the way back
考题
单选题When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）A
The six-way valve opensB
The steering service pump motor is stoppedC
The follow-up gear takes the pump off strokeD
The cylinder relief valves bypass oil to the suction side the pump
考题
单选题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 jammedB
be openedC
be seatedD
be broken
考题
单选题The period of valve overlap is when （）.A
the inlet valve is openB
the exhaust valve is openC
both valves are closeD
both valves are open
考题
单选题If the needle valve in a fuel injection nozzle sticks open （）.A
no fuel will be delivered through the nozzleB
the nozzle will overheat and crackC
time of injection will changeD
fuel will leak into the drain line
考题
单选题Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）A
Spring-centered valveB
Unloading valveC
Three-position valveD
Two-position valve
考题
单选题Water fog from an all-purpose nozzle may be used to（）.A
fight an electrical fireB
fight a magnesium fireC
eliminate smoke from a compartmentD
All of the above
考题
单选题One advantage of the all-purpose nozzle is that it（）.A
can fit any size hoseB
converts a stream of water into a fogC
increases the amount of water reaching the fireD
can spray two streams of water at the same time
考题
单选题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.A
shield fire fighters from radiant heatB
break up burning materialC
get the most water possible on the fireD
drive heat and smoke ahead of the fire fighters
考题
单选题The all-purpose nozzle will produce a fog spray when you（）.A
pull the nozzle handle all the way back toward the operatorB
pull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzleC
push the nozzle handle forward as far as it will goD
insert a fog applicator between the fire hose and nozzle
考题
单选题The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to（）.A
a difference in water pressureB
the method of breaking up the water streamC
the length of the applicatorD
All of the above
考题
单选题Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）A
erosion and cratering of the nozzle orificesB
fuel leakage into the nozzle drain lineC
fuel leakage before and after injectionD
insufficient fuel delivery though that nozzle
考题
单选题In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）A
When the helm is at any angle other than amidshipsB
When the six-way valve is openedC
When the ram relief valves liftD
When the redder angle is different from the position of the helm
考题
单选题A combination or all-purpose nozzle produces（）.A
low-velocity fog onlyB
a solid stream onlyC
a solid stream and foamD
a solid stream and fog
考题
单选题When the heat load begins to increase, the needle valve of an expansion valve will（）A
move in an opening directionB
move in a closing directionC
either open or closeD
not move at all
考题
单选题Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?（）A
Fuel injection timing will changeB
Nozzle operation will be unaffectedC
Fuel will leak into the drain lineD
Fuel will not be delivered
考题
单选题A Kort nozzle is a(n)（）.A
hollow tube surrounding the propeller used to improve thrustB
nozzle attached to a firefighting hoseC
intake valve on a diesel engineD
piston cylinder on a diesel engine
考题
单选题An interlock in the remote operating valve line stops the valve （） when the engine turning gear is engaged.A
to openB
openingC
openD
opened
考题
单选题The 12-foot low-velocity fog applicator（）.A
has a spray pattern 12 feet in diameterB
can be used in conjunction with both 1-1/2 inch and 2-1/2 inch all-purpose nozzlesC
has a 90°bend at its discharge endD
has a screw thread end which connects to the all-purpose nozzle
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