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A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）
A、the use of a poor quality oil
B、the deterioration of its properties
C、the formation of deposits
D、the reduction in heat transfer ability
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When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）
A . The diesel oil must never be allowed to mix with the heavy fuel
B . The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve
C . The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve
D . The heating steam must be secured before the diesel oil passes through the three-way valve
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During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）
A . Flywheel inertia
B . Admission of starting air
C . The way of the vessel
D . securing of fuel to the cylinder
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A large oil fire on the deck of a ship can be fought most effectively with（）.
A . dry chemical
B . foam
C . high-velocity fog
D . water
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The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
A . direct action of cam shaft
B . compressed air pressure
C . hydraulic “push rods”
D . direct action of the main piston moving dow
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What is NOT used as a stern tube bearing，on a large vessel? （）
A . Wooden (lignum vitae) strips
B . Hard rubber
C . Resin bonded composition
D . Bronze bushing
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Which component should you use to reduce collision issues on a large LAN?（）
A . Switch
B . Repeater
C . Printer
D . Host
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A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
A . cylinder heads
B . exhaust valves
C . scavenging air
D . injector
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（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.
A . The medium speed 4-stroke trunk piston engine
B . The low speed 2-stroke crosshead engine
C . The medium speed 2-stroke crosshead engine
D . The low speed 4-stroke trunk piston engine
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Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
A . fuel oil vapor at the sludge tank vent
B . unburned fuel vapors in the scavenge air receiver
C . lube oil vapors in the crank case
D . lube oil vapors in the engine room
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The main purpose of an electric space heater installed in a large AC generator is to （）
A . prevent the windings from becoming brittle
B . prevent moisture from condensing in the windings during shutdown
C . prevent acidic pitting of the slip rings
D . keep the lube oil warm for quick starting
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In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）
A . build up the piston crown by metal spraying
B . build up the cylinder head by metal spraying
C . insert shims between the crankpin bearing box and the connecting rod foot
D . install a thinner head gasket
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On a large diesel engine installation, crankshaft axial alignment is maintained by the （）
A . piston rod guides
B . engine thrust bearing
C . crosshead bearing
D . main shaft flexible coupling
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Which of these tools should you use to compress VoIP packets on a low-speed Frame Replay circuit?（）
A . Cisco Proprietary payload compression
B . Predictor payload compression
C . RTP header compression
D . TCP header compressio
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Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）
A . Electric
B . Hydraulic
C . Air
D . All of the above
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Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）
A . decrease the time required between cleanings
B . removes all large and small foreign objects
C . ensure a positive flow of oil at all times
D . ensure that all lube oil has been treated twice
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While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）
A . Manually trip the over-speed device
B . Interrupt the fuel flow to the engine
C . Disengage the safety interlock
D . Slide the camshaft to the neutral positio
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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 gearing
B . a minimum speed for the engines that limits the minimum speed of the vessel
C . the higher fuel consumption per SHP
D . the low efficiency of the system when a controllable pitch propeller is used
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Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）
A . cooling water leaving each cylinder
B . fuel oil entering the injector
C . exhaust gases at various locations
D . lube oil at the bearing supplie
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If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its （）
A . fuel pump should be removed and all connections blanked off
B . cylinder oil feed rate should be increased slightly above that used at normal sea speed
C . cylinder oil feed rate should be reduced
D . cylinder oil feed rate should be increased to the maximum flow capable of the metering pum
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On a weather map,a large letter “h” means（）
A . a high pressure area with cool, dry air and fair weather
B . a high pressure area with warm, moist air and inclement weather
C . horse latitudes, with rough seas and strong winds
D . a heavy squall line near the “H&rdquo
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On a weather map, a large letter “H” means ______.
A.a high pressure area with cool, dry air, and fair weather
B.a high pressure area with warm, moist air, and inclement weather
C.horse latitudes, with rough seas and strong winds
D.a heavy squall line near the “H”
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Mathilda is a Linux administrator on a large network.She does not have access to Linux
A．But she wants to automate the account creating process.Which of the following choices will best help Mathilda to simplify the process？()
B．Establish a default system profile file and use the user add-D command when creating new users.
C．Establish a default system profile file and use the user add-d command when creating new users.
D．Establish a default system profile file and use the user add-G command when creating new users.
E．Establish a default system profile file and use the user add-g command when creating new users.
