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单选题
As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.
A
the inlet valve
B
the outlet valve
C
both the inlet valve and the outlet valve
D
the pump inlet valve
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dial indicatorB
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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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Slide the camshaft to the neutral position
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单选题An over-speed trip stops a diesel engine when the engine （）A
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medium-speed dieselC
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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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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
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caused by a mechanical defect in one cylinderC
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单选题Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）A
increasing the quantity of starting airB
increasing the lube oil pressureC
heating the engine fuel supplyD
heating the engine coolant
考题
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
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考题
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
考题
单选题The rotating range of the low speed diesel engine is usually lower than （）.A
100 rpmB
200 rpmC
300 rpmD
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单选题When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）A
During operation at low speedB
During operation at rated speed, but low power outputC
During accelerationD
All of the above
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单选题If a main propulsion diesel engine hunts excessively at idle speed, you should （）A
adjusts the idle speed controlB
drain and flushes the governor and replace the oilC
adjusts the compensating needle valve
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单选题If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.A
compression pressures are below normalB
lube oil is diluted with fuel oilC
cranking speed is too lowD
exhaust system is partially restricted
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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
Admission of starting airC
The way of the vesselD
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单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.A
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keeps constant at all engine speed, dependent on the engine speed to some extentC
keeps constant at all engine speed, independent of the engine speedD
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考题
单选题A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.A
cylinder headsB
exhaust valvesC
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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
low TBN valueB
high alkaline reserveC
low flash pointD
high pour point
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单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）A
immediately open all crankcase relief portsB
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考题
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
考题
单选题If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）A
decrease until the engine speed increasesB
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decrease as the loadD
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考题
单选题On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）A
Engine is hard to startB
Engine missesC
Surges at governed RPMD
Coolant temperature is too low
考题
单选题An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.A
manoeuvring operationsB
bad combustionC
coolingD
mooring trial
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单选题The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.A
large conical springsB
compressed air pressureC
hydraulic pressureD
exhaust gas pressure
考题
单选题How should you warm up a diesel engine that has not been run for some time? （）A
Run it at minimum speed for a period of timeB
Run it at half speed for a period of timeC
Bring it to top speed immediatelyD
Inject ether into the air intake
考题
单选题Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）A
Injection pressuresB
Control air supply pressureC
Cooling water flow through after-coolersD
Lube oil temperature
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