When fuel enters the crankcase of a diesel engine, it （）
A . dilutes the lube oil and reduces its viscosity
B . forms sulfuric acid in the lube oil
C . causes pitting and failure of the bearings
D . causes sludge deposits on valve stem
相似题目
-
The amount of expansion space to be left in a fuel tank when fuel oil is being received, is determined by the （）.
A . quantity of fuel to be received
B . flash point of the fuel as it is received
C . fuel temperature as it is received
D . viscosity of the fuel being received
-
When the fuel oil is burning in the combustion chamber, it （）.
A . gives up large amount of heat
B . gives off large amount of heat
C . gives up large amount of steam
D . gives off large amount of steam
-
Which of the following are automatically configured on the CallManager when entered on the CRS Application Administration?（）
A . CTI port
B . CTI Route Point
C . agent skills
D . JTAPI user
E . CRS prompt language
F . ASR provider &e
-
When considering the lowest fuel system operating temperature, （） are important.
A . specific gravity or relative density
B . open flash point and closed flash point values
C . higher calorific and lower calorific values
D . cloud point and pour point value
-
The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.
A . will lift
B . will be lifted
C . will close
D . will be closed
-
In a diesel engine, when the fuel is injected into the cylinder,（）
A . the piston is just coming upward from the bottom dead center
B . the piston has moved about one-fifth of the way up
C . the piston has moved most of the way up and almost reached the TDC
D . the piston has just past the TDC
-
If a diesel engine rotates slowly when cranked, but does not fire, the（）
A . fuel control rack had admitted excessive fuel
B . engine speed does not match the fuel rack setting
C . engine has failed to reach its firing speed
D . starter pinion and ring gear contact is not correct
-
When centrifuging heavy fuel oil, an important factor to consider is the （） (1) flow rate (2) viscosity of the fuel oil
A . (1) only is correct
B . (2) only is correct
C . both (1) and (2) are correct
D . neither (1) or (2) are correct
-
When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）
A . suction stroke
B . compression stroke
C . power stroke
D . exhaust stroke
-
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 jammed
B . be opened
C . be seated
D . be broke
-
Which of the following operations need NOT to be entered on the Oil Record Book Part I?（） (1) Disposal of oil residues (2) Internal transfer of fuel oil
A . （1）only
B . （2）only
C . both（1）and（2）
D . neither（1）nor（2）
-
When entering a channel from seaward，the numbers on buoys（）.
A . are the same as their Light List number
B . are marked in 6 inch figures with retroreflective material
C . increase with the even numbers to starboard
D . decrease with the odd numbers to starboard
-
When mother entered the bed room, little Shelly pretended（）asleep.
A . having fallen
B . to be falling
C . being fallen
D . to have falle
-
When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
A . intake stroke
B . compression stroke
C . power stroke
D . exhaust stroke
-
When a ship is entering to narrow waterway and the fuel feeding of the main engine is keeping unchanged, which of the following is the wrong conclusion?（）
A . the power of main engine will be reduced
B . exhaust temperature will be increased
C . the speed of the ship will be reduced
D . the propulsion characteristic of propeller will keep unchanged
-
A four-stroke/cycle, 1000horsepower diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperatureThe reason for the failure could be（）
A . glazed liners or pistons
B . high lube oil pressure
C . excessive compression ratio
D . worn valve seats and valve
-
When the ships is going to enter into the harbor,（）.
A . change from diesel oil to heavy fuel oil for mail engine
B . pump out bilge water
C . change sea chest form lower level one to high level one
D . test emergency generator
-
During fueling operations, which of the listed precautions should be taken when topping off fuel tanks?（）
A . Reduce the pumping rate by closing the deck filling valve
B . Close all overflow valves
C . Place 5 gallon containers under all flange connections in the fuel line
D . Reduce the pumping rate and sound tanks frequently as the level rise
-
During working, when the piston is near the （）, the air ignites the fine spray of fuel.
A . TDC
B . DTC
C . BDC
D . BCD
-
The starting air entering the cylinder begins when the piston（）
A . has nearly come to the TDC
B . has just past the TDC
C . has nearly come to the BDC
D . has just past the BDC
-
When I entered the classroom, I found the students ________ the questions in group.
-
The priest made the____of the cross when he entered the church.
A．mark
B．signal
C．sign
D．gesture
-
The girl dressed in strange clothes soon became the f of attention when she entered the classroom.
-
Scarcely had he entered the room when he broke out in insult.
A、他受辱而突然走出之后，就很少再进此屋来。
B、他还没进屋就破口骂人。
C、他才进屋就口出怨言。
D、他一进门就破口大骂。
