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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
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If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）
A . backfire through the air intakes
B . develop less power under load
C . have high firing pressures
D . lift its cylinder relief valve
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Problems with the diesel engine fuel injection pump are usually caused by（）
A . improper adjustment
B . contaminated fuel
C . kinked fuel lines
D . excessive engine vibratio
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The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）
A . fuel delivery pressure
B . pump plunger diameter
C . plunger control rack position
D . total pump stroke
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The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）
A . camshaft
B . crankshaft
C . governor
D . flywheel
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A diesel engine will lose power if fuel injection occurs too early because the （）
A . fuel will not be properly atomized in the cylinder
B . ignition will be delayed due to low ignition temperature
C . maximum fuel expansion will occur on the compression stroke
D . fuel will ignite before top dead center
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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
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Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）
A . erosion and cratering of the nozzle orifices
B . fuel leakage into the nozzle drain line
C . fuel leakage before and after injection
D . insufficient fuel delivery though that nozzle
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When a fuel injection nozzle overheats, which of the problems listed can be expected?（）
A . The fuel metering will vary
B . The fuel will explode
C . The cylinder head will crack
D . The engine will sto
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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
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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
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In a common rail engine, the fuel is injected into cylinders（）
A . by injection pumps
B . at a time decided by the injection pump timing
C . by a signal opening the magnetic valves
D . at a time decided by the cam directly
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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
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The sequence of fuel injection into cylinders is determined by （）.
A . the steering
B . the driven gear
C . the turning gear
D . the timing gear
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When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）
A . to work as overload characteristic
B . overspeed
C . over mechanical load only
D . over thermal load only
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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
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The major cause of fuel pump and injection system problems is （）
A . improper adjustments
B . contaminated fuel
C . kinked fuel lines
D . excessive engine vibratio
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The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.
A . has begun
B . takes place
C . occurs
D . happe
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A diesel engine will lose power if fuel injection occurs too late in the cycle, because the（）
A . fuel droplets will burn as they leave the fuel injector
B . fuel will not be properly atomized in the cylinder
C . maximum expansion of the burned fuel cannot take place in the cylinder
D . compression pressure will be too low to cause fuel ignitio
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If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）
A . only the replacement of the entire pump would be acceptable
B . the injection pump and injection nozzle must be replaced
C . either the barrel or plunger must be replaced
D . the barrel and plunger must be replaced as a unit
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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
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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
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To minimize the formation of carbon deposits on fuel injection nozzles, you should （）
A . avoid using liquid-cooled nozzles whenever possible
B . avoid low cooling water temperatures
C . avoid prolonged overloading of the engine
D . make certain the gasket seal between the nozzle and cylinder head is tight
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Problems with the diesel engine fuel injection pump are usually caused by_____.
A.improper adjustment
B.contaminated fuel
C.kinked fuel lines
D.excessive engine vibration
