[单项选择]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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[单项选择]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

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[单项选择]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 supplies

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[单项选择]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

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[单项选择]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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[单项选择]The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）
A. quantity of air it takes in and retains in the cylinders during a given time period
B. proportion of trapped air that is utilized in the combustion process
C. thermodynamic efficiency of the engine cycle
D. all of the above

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[单项选择]When the（）is large, the ship is stiff; and when it is small, she is tender.
A. GM
B. free surface
C. longitudinal center of gravity
D. transverse center of gravity

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[单项选择]In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）
A. top of the ring groove
B. back of the ring groove
C. bottom of the ring groove
D. piston ring end clearance

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[单项选择]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. injectors

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[单项选择]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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[单项选择]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

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[单项选择]A fluid coil will （） large quantifies of heat when it changes state from a liquid to a vapor.
A. release
B. absorb
C. develop
D. regenerate

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[单项选择]In most cases，when a large merchant vessel enters shallow water at high speed the（）.
A. maneuverability will increase
B. speed will increase
C. bow will squat farther than the stern
D. vessel will rise slightly，on a level plane

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[单项选择]In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）
A. Bed plate
B. Column
C. Entablature
D. Tie rod

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[单项选择]When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be（）
A. disengaging the clutch firstly, then stopping the main engine
B. stopping the main engine firstly, then disengaging the clutch
C. stopping the cooling water pump firstly, then stopping the main engine
D. stopping the main engine and disengaging the clutch at the same time

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[单项选择]In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the （）
A. fuel must be preheated
B. intake air should be preheated
C. lube oil outlet temperature should be increased 20℃ above normal
D. none of the above

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[单项选择]A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）
A. low TBN value
B. high alkaline reserve
C. low flash point
D. high pour point

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[单项选择]When cargo is shifted from the main deck into the lower hold of a vessel,（）.
A. The metacenter will move downward
B. The GM will increase
C. The center of buoyancy will move upward
D. The list of the vesel will become great

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