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单选题
In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）
A
build up the piston crown by metal spraying
B
build up the cylinder head by metal spraying
C
insert shims between the crankpin bearing box and the connecting rod foot
D
install a thinner head gasket
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更多 “单选题In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）A build up the piston crown by metal sprayingB build up the cylinder head by metal sprayingC insert shims between the crankpin bearing box and the connecting rod footD install a thinner head gasket” 相关考题
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单选题The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）A
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adjusted during each hour of operation while at constant RPMC
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dial indicatorB
outside caliperC
bridge gaugeD
tram rod
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increasing the quantity of starting airB
increasing the lube oil pressureC
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单选题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）A
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back of the ring grooveC
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单选题While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）A
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Interrupt the fuel flow to the engineC
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单选题As to the bearing, of the following, which statement is not true?（）A
ff overheat is found, the engine must be stopped for inspectionB
Much heat of the crankcase door indicates that the bearing is overheatedC
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单选题The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.A
direct action of cam shaftB
compressed air pressureC
hydraulic “push rods”D
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increasing the quantity of starting airB
increasing the lube oil pressureC
heating the engine fuel supplyD
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单选题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 ventB
unburned fuel vapors in the scavenge air receiverC
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单选题Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured?（）A
Lubrication to the defective cylinder should be increasedB
Cooling water temperature to the engine should be increasedC
Only the turbocharger speed should be reducedD
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单选题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 preheatedB
intake air should be preheatedC
lube oil outlet temperature should be increased 20℃ above normalD
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单选题Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）A
Plugged injector nozzlesB
Excessive fuel injectionC
Very late injection timingD
Incorrect crankshaft clearance
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backB
sideC
gapD
bottom
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单选题During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）A
Flywheel inertiaB
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The way of the vesselD
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cylinder headsB
exhaust valvesC
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injectors
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gapB
sideC
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单选题A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）A
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high alkaline reserveC
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单选题Low compression pressure in a diesel engine may be the result of （）A
insufficient fuel supply due to fuel pump valves sticking or leakingB
excessive mechanical clearance between the piston crown and cylinder headC
excessively worn fuel pump plungerD
excessive exhaust back pressure
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单选题In a naturally aspirated diesel engine, the volume of air intake is directly related to engine （）.A
compression ratioB
valve sizeC
fuel pressureD
cylinder clearance volume
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单选题Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）A
ElectricB
HydraulicC
AirD
All of the above
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单选题For a diesel engine, when the piston is at the （）, the clearance volume is the largest.A
TDCB
DTCC
BDCD
DBC
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单选题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 fuelB
The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveC
The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveD
The heating steam must be secured before the diesel oil passes through the three-way valve
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单选题Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）A
decrease the time required between cleaningsB
removes all large and small foreign objectsC
ensure a positive flow of oil at all timesD
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