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单选题
Maximum horsepower of a diesel engine is attained （）.
A
when the engine RPM is pulled down by overload
B
at rated engine RPM
C
at 95 % of rated engine RPM
D
at 95 % of a properly adjusted governor RPM with the engine under full load
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单选题The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.A
principleB
principalC
causeD
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考题
单选题To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）A
Speed limiting governorB
Over-speed governorC
Over-speed tripD
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考题
单选题Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.A
operated manually once an hourB
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考题
单选题A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）A
ignition lagB
engine horsepowerC
lube oil system pressureD
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考题
单选题An over-speed trip stops a diesel engine when the engine （）A
runs out of fuelB
has low lubricating oil pressureC
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has high cooling water temperature
考题
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Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）A
chromium plating piston ringsB
knurling the piston skirtC
extended maximum power operationD
applying load to a cold diesel engine
考题
单选题The size of the exhaust valve opening is （）A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
most critical in a four-stroke/cycle diesel engine if it is turbochargedD
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
考题
单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）A
bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedB
bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedC
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two-stoke/cycle diesel engines require more complicated lubrication piping
考题
单选题What is the effect of heated intake air on a diesel engine? （）A
Increases efficiencyB
Increases engine horsepowerC
Increases engine lifeD
Reduces engine horsepower
考题
单选题The ratio of the brake horsepower to the indicate of a diesel engine is its （）A
thermal efficiencyB
mechanical efficiencyC
brake thermal efficiencyD
volumetric efficiency
考题
单选题The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）A
speed, torque, and horsepower productionB
firing order, valve timing, and valve liftC
fuel consumption, efficiency, and cylinder pressureD
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考题
单选题If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two-stroke/cycle diesel engine will develop approximately（）A
the same indicated horsepower as a four-stroke/cycle engineB
twice the indicated horsepower as a four-stroke/cycle engineC
one half indicated horsepower as a four-stroke/cycle engineD
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考题
单选题Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.A
reduce engine horsepower outputB
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increase the mean effective pressureD
contribute to effective cylinder scavenging
考题
单选题Exhaust pyrometer readings provide an indication of the （）A
effectiveness of water-cooled exhaust elbowsB
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amount of fuel penetration into the engine cylindersD
indicated horsepower of the engine cylinders
考题
单选题Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?（）A
compression must be low for effective spark ignitionB
compression must be low for required horsepower and torque generationC
compression must be low to prevent pre-ignitionD
compression must be low to have effective pre-ignition
考题
单选题A restricted air intake to a diesel engine may result in the engine （）.A
failing to reach rated speedB
knocking under maximum loadC
hunting or surging under light loadD
overspeeding and running away
考题
单选题After-cooling of a turbocharged diesel engine will result in （）A
higher torque but lower brake horsepowerB
lower torque but higher brake horsepowerC
higher torque and lower brake horsepowerD
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考题
单选题While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）A
the bearing had been overheatedB
water was present in the oilC
the lube oil was not being properly filteredD
the maximum allowable bearing pressure had been exceeded
考题
单选题An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.A
decrease in maximum cylinder pressureB
increase in ignition lagC
decrease in fuel consumption per horsepower-hourD
decrease in exhaust manifold pressure
考题
单选题Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.A
two fuel oil transfer pumps provided where one is to be independent of the main engineB
two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engineC
engine driven transfer pumps and only used in constant speed applicationsD
the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
考题
单选题A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）A
reduce loadB
check your exhaustC
adjust cooling water temperatureD
increase lube oil flow
考题
单选题A four-stroke/cycle, 1000horsepower diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperatureThe reason for the failure could be（）A
glazed liners or pistonsB
high lube oil pressureC
excessive compression ratioD
worn valve seats and valves
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