-
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
-
Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.
A . overspeed trip
B . audible/visual alarm
C . the ships/boats general alarm
D . reserve oil storage tank
-
What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）
A . White
B . Black
C . Blue
D . Clear
-
A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）
A . early fuel injection
B . excessive bearing play within the running gear
C . overloading of the cylinder
D . all of the above
-
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
-
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
-
On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.
A . a spindle lubricator
B . an oil jet
C . internal splashing
D . drilled passages in the crankshaft
-
When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）
A . starting air pressure
B . scavenge air pressure
C . over-speed trip
D . banjo oiler line
-
The main propulsion diesel continues running after you try to shut downYoushould now attempt to（）
A . stop the combustion air supply
B . engage the jacking gear
C . secure the lube oil pump
D . shut off the fuel at the day tank
-
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
-
The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.
A . alternator
B . turbo-charger
C . remote controller
D . windla
-
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
-
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
-
Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.
A . decreased fuel consumption per brake horsepower
B . more complete cylinder scavenging
C . extended valve life
D . carbon formation on combustion chamber surface
-
On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）
A . dial indicator
B . outside caliper
C . bridge gauge
D . tram rod
-
Main propulsion engine lube oil sumps should be constructed （）
A . so as to never be integral lube
B . with a sloped bottom
C . only of nonferrous, noncorrosive metals
D . with drain/return lines terminating just above or at the designed normal level
-
Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）
A . Defective temperature controls in the system
B . Cavitation in the cooling water pump
C . Opened vent in the cooling system
D . Restricted water passages in the engine
-
Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）
A . the lubricating oil consumption
B . the turbine blade temperature
C . the flow rate of fuel
D . scavenge air pressure
-
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
-
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
-
Changes in direction or speed of the main propulsion units shall be recorded, （）an Administration has determined that the size or characteristics of a particular ship make such recording impracticable.
A . in addition to
B . in addition that
C . except for
D . except where
-
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
-
Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）
A . engine support vibration isolator
B . detuner or viscous fluid damper
C . lightened crankshaft flywheel
D . spherically seated crankshaft bearing
-
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
