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单选题
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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An over-speed safety device is usually fitted to a generator engine for ___ in the event of over-speed.A.stabilizing the ship speedB.increasing the fuel pump settingC.braking the crankshaftD.cutting power off the engine
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单选题The main purpose of changing main engine to electronic controlled is not to()A
control fuel injection time more preciselyB
control fuel injection rate more preciselyC
meet the environmental requirementsD
meet high engine speed requirements
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单选题When a ship is entering to shallow water, ship resistance will be increased and the speed of main engine reduced.Due to the function of the governor, the main engine will()A
reduce fuel feedingB
increase fuel feedingC
keep original fuel feedingD
be overspeed
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单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer,the ()A
quantity of fuel injected is decreasedB
quantity of fuel injected will always be increasedC
start of injection is advancedD
duration of injection will always be greater
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单选题The primary function of a fuel delivery check valve assembly is to()A
deliver proper fuel quantity to the injection nozzleB
provide rapid fuel injection cutoffC
control fuel quantity entering the pump bodyD
control fuel pressure delivered to the combustion chamber
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单选题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 + ⅡB
Ⅰ ~ ⅢC
Ⅰ ~ ⅣD
Ⅰ + Ⅱ + Ⅳ
考题
单选题If the needle valve in a fuel injection nozzle sticks open ().A
no fuel will be delivered through the nozzleB
the nozzle will overheat and crackC
time of injection will changeD
fuel will leak into the drain line
考题
单选题The burning of fuel oil in a diesel engine having a high sodium content, will cause ()A
corrosion and grooving of exhaust valvesB
corrosion and gumming of the fuel injection pumpC
salt deposits in the exhaust manifoldD
slag deposits in the fuel injection equipment
考题
单选题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
BHPB
MCRC
IHPD
MEP
考题
单选题Failure of fuel injection is usually due to trouble in the ().A
exhaust valvesB
mechanical lubricatorsC
cooling water pumpsD
fuel injection pumps
考题
单选题The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is().A
caused by retarded injection timingB
caused by a mechanical defect in one cylinderC
caused by high fuel injection pressuresD
normal for these conditions
考题
单选题When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?()A
Quantity of fuel injected tends to be decreasedB
Quantity of fuel injected will always be increasedC
Start of injection tends to be advancedD
Duration of injection will always greater
考题
单选题When preparing a ship for heavy weather,fuel oil day tanks should be().A
pumped overboard to calm the seasB
drained to the lower hull to reduce free surfacesC
filled to ensure that sufficient fuel oil is available during a lengthy emergencyD
partially drained to increase free surfaces in order to reduce motions
考题
单选题When the vessel on the full speed ahead, if full astern immediately () the main engine start astern and fuel injection.A
after the thrust power is zeroB
after the torsion is zeroC
surpass the critical point on the water turbo phaseD
after the speed is zero
考题
单选题During the fuel injection period, fuel pressure must exceed cylinder gas pressure to ().A
ensure penetration and distribution of the fuel in the combustion chamberB
ensure the needle valve is flushed clean during each injectionC
prevent combustion gas blowback into the open needle valveD
prevent reflected pressure waves when the needle valve closes
考题
单选题The main source of fuel injection system malfunctions is ()A
improper adjustmentsB
contaminated fuelC
coated fuel linesD
excessive vibration
考题
单选题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 loadB
maintaining the metering adjustment for a reasonable period under all load conditionsC
timing fuel injection to obtain maximum power and good fuel economyD
distributing the fuel to all parts of the combustion chamber for proper combustion
考题
单选题Which of the following is true about the fuel injection with an ordinary diesel engine?()A
The process begins after TDCB
The process ends before TDCC
When the piston is near to the TDC the fuel injection endsD
None of the above is true
考题
单选题Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?()A
The amount of fuel injected will be increasedB
The start of injection will be retardedC
The nozzle will permit fuel to dribbleD
The spray pattern will be distorted
考题
单选题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 injectionB
allow oil backflow from the injector to the helixC
reduce fuel oil pressure between injection strokesD
meter the quantity of fuel delivered
考题
单选题Faulty operation of diesel engine fuel injection nozzles can be a direct cause of().A
excessive fuel nozzle holder coolingB
sediment in the fuel supplyC
distortion of the fuel spray patternD
improper atomization of the fuel
考题
单选题When a fuel injection nozzle overheats, which of the problems listed can be expected?()A
The fuel metering will varyB
The fuel will explodeC
The cylinder head will crackD
The engine will stop
考题
单选题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 reducedB
exhaust temperature will be increasedC
the speed of the ship will be reducedD
the propulsion characteristic of propeller will keep unchanged
考题
单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should()A
increase the starting air pressureB
use a higher than normal cranking speedC
increase the fuel injection pressureD
use a fuel having a lower ignition temperature
考题
单选题Fuel injection systems meter fuel, atomize fuel, and ().A
create turbulence in the combustion chamberB
aid in completing cylinder scavengingC
inject fuel at the proper timeD
minimize fuel penetration into the cylinder
考题
单选题When ship navigating in rough sea, the correct operation is ()A
navigating with a low diesel engine speedB
navigating with a stable diesel engine speedC
increasing the efficiency of propellerD
increasing fuel injection
考题
单选题When checking a mooring line,you should().A
ensure the bight is not fouled between the ship and the dock by taking up slackB
pay out slack smartly and keep free for runningC
secure more turns to hold the line against any strain,then clear the areaD
surge the line so that it maintains a strain without parting
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