网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
Engines for lifeboats are required to have sufficient fuel to operate for how many hours?（）
A
6 hours
B
12 hours
C
18 hours
D
24 hours
参考答案
参考解析
解析：
暂无解析
更多 “单选题Engines for lifeboats are required to have sufficient fuel to operate for how many hours?（）A 6 hoursB 12 hoursC 18 hoursD 24 hours” 相关考题
考题
Main engines as well as auxiliary engines operating on heavy fuel should have continuousoon the lubricating oil, either according tothebypass or batch principles
A.filteringB.centrifugingC.depositingD.operating
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
What is required to be entered into the Official Logbook?A.Opening a sideport at sea to renew a gasketB.The annual required stripping and cleaning of the lifeboatsC.The biennial weight test of the lifeboats and fallsD.The drafts on entering port
考题
A safe fuel system must ______.A.prevent engine overheatingB.have proper air/gasoline fuel mixture ratioC.be liquid- and vapor-tightD.supply sufficient air to the intake manifold
考题
______ of the following statements is（are）correct regarding motor lifeboats on cargo vessels．① The motor of each lifeboat shall be operated in the ahead and astern position for a period of not more than 5 minutes once in each week；② The fuel tank of all motor-propelled lifeboats shall be emptied and the fuel changed at least once in every year．A.① onlyB.② onlyC.Both ① and ②D.Neither ① nor ②
考题
单选题One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.A
the extra weight required for the diesel reduction gearingB
a minimum speed for the engines that limits the minimum speed of the vesselC
the higher fuel consumption per SHPD
the low efficiency of the system when a controllable pitch propeller is used
考题
单选题All engines in lifeboats and rescue boats shall be run for a total period of not less than（）in weekly inspections.A
2 minutesB
3 minutesC
4 minutesD
5 Minutes
考题
单选题The total starting air capacity required for reversible main engines is to be sufficient for at least （）.A
six consecutive startsB
eight consecutive startsC
ten consecutive startsD
twelve consecutive starts
考题
单选题On most diesel engines, the governor controls the output speed by （）.A
controlling the amount of fuel injected into the cylindersB
varying the speed of the turbochargerC
adjusting the compression ratioD
changing the timing of the fuel injection camshaft
考题
单选题In context, which of the following revisions of the underlined portion of sentence 12(reproduced below) is most effective at making it clearer and more specific?Unfortunately, many students today don’t have time for that.A
today have hardly even 1 hour for such thingsB
today, unlike those in Archimedes’ time, don’t have time to go to the moviesC
today don’t have time for such excursionsD
of modern times lack sufficient time for the kinds of things explained aboveE
today lack sufficient time for things like this
考题
单选题While a ship with twin screw is making a turn, in order to prevent overload, the duty engineer should （）A
reduce the fuel feeding of main engine of inner propellerB
reduce the fuel feeding of main engine of outer propellerC
firstly reduce the fuel of main engine of inner propeller, then reduce the fuel feeding of engine of outer propellerD
reduce fuel feeding of two engines at the same time
考题
单选题What is required to be entered into the Official Logbook? （）A
Opening a sideport at sea to renew a gasketB
The annual required stripping and cleaning of the lifeboatsC
The biennial weight test of the lifeboats and fallsD
The drafts on entering port
考题
单选题Diesel engines are considered safer than gasoline engines because（）.A
they are more heavily builtB
the fuel used is less volatileC
they can be easily reversedD
they operate at a lower speed
考题
单选题（）, so they are widely used on board ship nowadays.A
Diesel engines have more advantages in comparison with gasoline enginesB
Diesel engines have more advantages in comparison to gasoline enginesC
Gasoline engines have more advantages in comparison with diesel enginesD
Gasoline engines have more advantages in comparison to diesel engines
考题
单选题The viscosity regulator controls （） in order to provide oil at the correct viscosity for combustion.A
the engines speedB
the engines loadC
the fuel oil temperatureD
the fuel oil flow
考题
单选题For self elevating and column stabilized units， is 100% lifeboat capacity acceptable for the MODU Code？（）A
No， the MODU Code requires that there should be 100% capacity available when all lifeboats in one location are lost or rendered unusable， or all the lifeboats on any one side， or any one corner of the unit are lost or rendered unusable. Generally， this requirement is met by applying 2 x 100% lifeboat capacitiesB
Yes， the lifeboats should be able of carrying the number of personnel onboard the unit.， i.e. 1 x 100%C
Yes， provided you have additional liferaft capacityD
You don’t need lifeboats as long as you have 2 x 100% liferaft capacity
考题
单选题Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）A
filteringB
centrifugingC
depositingD
operating
考题
单选题A safe fuel system must（）.A
prevent engine overheatingB
have proper air/gasoline fuel mixture ratioC
be liquid- and vapor-tightD
supply sufficient air to the intake manifold
考题
单选题What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）A
ElectricityB
Chain reactionC
PressureD
Smoke
考题
单选题“The engine not obtaining the sufficient speed for firing” means that （）.A
the start failsB
the fuel pumps will be put into operationC
the fuel valves are damagedD
the combustion process will take over
考题
单选题Engines for lifeboats are required to have sufficient fuel to operate for how many hours?（）A
6 hoursB
12 hoursC
18 hoursD
24 hours
考题
单选题Fuel injected into a diesel engines cylinder is ignited by （）.A
the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
the fuel injectorD
the fuel pump
考题
单选题In common rail engines, the fuel is（） before is injected into the cylinders.A
stored in a common fuel lineB
pumped by the injection pumpC
at low pressureD
already atomized
考题
单选题Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.A
two fuel oil transfer pumps provided where one is to be independent of the main engineB
two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engineC
engine driven transfer pumps and only used in constant speed applicationsD
the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
考题
单选题The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）A
governor flyweight action on a pilot valve which controls fuel injectionB
governor flyweight motion acting on fuel controls through suitable linkageC
positioning a butterfly valve in the fuel delivery system positioningD
a servomotor piston attached to the fuel controls
考题
单选题What is required by regulations concerning the stowage of lifeboats on cargo vessels?（）A
Each lifeboat must have a launching applianceB
Launching appliances must be of the gravity typeC
There may not be more than two launching appliances on the same deckD
All of the above
热门标签
最新试卷