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单选题
A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.
A
as much fuel as
B
less fuel than
C
less fuel as
D
more fuel than
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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
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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
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单选题A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）A
ignition lagB
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单选题The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.A
to be keptB
loggedC
changedD
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单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-strokeA
(1) only is correctB
(2) only is correctC
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单选题What determines the number of events occurring in a cycle of operation in an internal combustion engine?（）A
Crankshaft revolutionB
Type of engine (diesel or gasoline)C
Distance a piston travels during a strokeD
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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
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单选题The size of the exhaust valve opening is （）A
most critical in a four-stroke cycle diesel engineB
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most critical in a four-stroke/cycle diesel engine if it is turbochargedD
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单选题Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）A
higher speed requiredB
flywheel-effectC
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单选题Before starting any diesel or gasoline engine，which of the following must be checked? （）A
Oil levelB
Flow of cooling waterC
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单选题A diesel engine is similar to a gasoline engine except that the former has no （）.A
cross-headB
cylinderC
connecting rodD
spark plug
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单选题The diesel engine is similar to the gasoline engine in that （）.A
both of them are ignited by compressed airB
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both of them have spark plugsD
the power is developed by the piston in the cylinder
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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, independent of the engine speedD
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单选题What is the effect of heated intake air on a diesel engine? （）A
Increases efficiencyB
Increases engine horsepowerC
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单选题Maximum horsepower of a diesel engine is attained （）.A
when the engine RPM is pulled down by overloadB
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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For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.A
it has a longer power strokeB
more air gets into the cylinder each strokeC
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单选题According to the relevant regulation, lifeboat should be powered by（）.A
inboard diesel engineB
outboard diesel engineC
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考题
单选题Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）A
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单选题The diesel engine is a type of （）.A
turbine engineB
gas turbineC
steam engineD
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单选题A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is （）A
one-half engine speedB
the same as engine speedC
twice engine speedD
four times engine speed
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单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longerA
(1) onlyB
(2) onlyC
both (1) and (2)D
neither (1) nor (2)
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单选题In a four-stroke/cycle diesel engine, the camshaft rotates at （）A
twice the crankshaft speedB
half the crankshaft speedC
the same speed as that of the crankshaftD
a speed independent of that of the crankshaft
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