-
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
-
Failure of fuel injection is usually due to trouble in the （）.
A . exhaust valves
B . mechanical lubricators
C . cooling water pumps
D . fuel injection pum
-
Fuel injection valves should be taken out, cleaned, and lifting checked every （）.
A . two to four months
B . four to six months
C . six to eight month
-
Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? （）
A . Viscosity is decreased
B . Octane number is altered
C . Pump speed is decreased
D . Blower’s speed is decreased
-
Heat damage to fuel injection nozzles can be prevented by avoiding （）
A . excessive fuel oil temperature
B . long periods of engine overload
C . metallic contact between nozzles and cylinder heads
D . hard carbon deposit and varnish on the nozzle
-
The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as （）.
A . delivering the same quantity of fuel to each cylinder for each power stroke according to engine load
B . maintaining the metering adjustment for a reasonable period under all load conditions
C . timing fuel injection to obtain maximum power and good fuel economy
D . distributing the fuel to all parts of the combustion chamber for proper combustio
-
During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
A . ensure penetration and distribution of the fuel in the combustion chamber
B . ensure the needle valve is flushed clean during each injection
C . prevent combustion gas blowback into the open needle valve
D . prevent reflected pressure waves when the needle valve close
-
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
A . Spark plug
B . Heat of compression
C . Carburetor
D . Glow ping
-
In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.
A . increase its quality
B . obtain complete burning
C . reduce its weight
D . all of the above
-
If the needle valve in a fuel injection nozzle sticks open （）.
A . no fuel will be delivered through the nozzle
B . the nozzle will overheat and crack
C . time of injection will change
D . fuel will leak into the drain line
-
The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.
A . because
B . though
C . since
D . until
-
Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.
A . water in the fuel oil supply
B . excessive fuel nozzle holder cooling
C . a distorted fuel spray pattern
D . leakage past the plunger into the oil drai
-
Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.
A . BHP
B . MCR
C . IHP
D . MEP
-
With VIT unit the timing of fuel injection of an engine can be regulated automatically according to the （）.
A . ship draft
B . pitch
C . engine load
D . oil viscosity
-
It should be evident that the amount of fuel injected into the cylinder is dependent on the position of the helix relative to the （）.
A . inlet port
B . exhaust port
C . spill port
D . scavenge port
-
Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）
A . employing fuel oil as a cooling medium
B . preventing hard carbon deposit on nozzle tips
C . avoiding fuel oil temperature exceeding builder’s specification
D . ensuring good metallic contact between nozzles and cylinder head
-
Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A . lower compression pressures
B . overheating without smoking
C . failure to start
D . a run away without load
-
A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）
A . feel the high pressure fuel line
B . check the cylinder exhausts for white smoke frequently
C . check the cylinder exhaust temperature
D . isolate each cylinder and inspect the injector
-
If keep the fuel injection of main engine unchanged when ship is fouled, that will causeⅠ.The speed of main engine to be reduced Ⅱ.Ship speed to be reduced Ⅲ.The resistance torque of propeller to be increased Ⅳ.Trim at stern to increase（）
A . Ⅰ + Ⅱ
B . Ⅰ ~ Ⅲ
C . Ⅰ ~ Ⅳ
D . Ⅰ + Ⅱ + Ⅳ
-
Early fuel injection timing is indicated by the cylinder pressure being（）
A . above normal with a below normal exhaust temperature
B . above normal with a normal exhaust temperature
C . below normal with a normal exhaust temperature
D . below normal with an above normal exhaust temperature
-
The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
A . assist in a quick cutoff of fuel injection
B . allow oil backflow from the injector to the helix
C . reduce fuel oil pressure between injection strokes
D . meter the quantity of fuel delivered
-
The insulin injection sites must be rotated in order to prevent erosion of the fat beneath the skin.
-
Whether a ship is sailing before the wind or sailing in the rough sea, we must reduce the fuel injection of the main engineFor the former one, it aims to prevent the main engine being , while for the later one, it aims to prevent the main engine being .
A.overspeed / overload
B.overload / overspeed
C.over torque / overspeed
D.low mechanical efficiency / overload
