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单选题
A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）
A
slightly less than atmospheric pressure
B
approximately equal to exhaust manifold pressure at all times
C
that is widely fluctuating constantly
D
decreasing as engine load increases
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更多 “单选题A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）A slightly less than atmospheric pressureB approximately equal to exhaust manifold pressure at all timesC that is widely fluctuating constantlyD decreasing as engine load increases” 相关考题
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My ship’s engine responds well to telegraph orders and takes about 80 seconds to reverse from full speed ahead to full speed astern. This sentence ______.A.indicates the engine’s particularsB.tells the engine’s functionC.shows the engine’s typeD.refers to the engine’s information
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Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?A.Ignition lag increases.B.Lube oil system pressure increases.C.Brake specific fuel consumption increases.D.Mechanical efficiency increases.
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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
case
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单选题Diesel oil may be used to cool （） of a diesel engine.A
cylindersB
exhaust valvesC
pistonsD
fuel valves
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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
engine horsepowerC
lube oil system pressureD
specific fuel consumption
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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 listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）A
Exhaust temperatureB
Lube oil levelC
Lube oil pressureD
Water level in the expansion tank
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
the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineD
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If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.A
open air-box drainsB
loss of cooling water to the diffuserC
gradual fouling of the air filtersD
improperly timed exhaust valves
考题
单选题Under which of the listed conditions can the engine room retake the throttle control from the bridge（）.A
Any time it is deemed necessaryB
Only with the masters permissionC
After a 10 minute delay to the input commandD
Only after the throttle has been placed in stop
考题
单选题Maximum horsepower of a diesel engine is attained （）.A
when the engine RPM is pulled down by overloadB
at rated engine RPMC
at 95 % of rated engine RPMD
at 95 % of a properly adjusted governor RPM with the engine under full load
考题
单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）A
has little or no internal frictionB
has a lower effective compression ratioC
operates with scavenge air under a positive pressureD
operates without energy absorbing intake and exhaust strokes
考题
单选题One cause of diesel engine surging can be a result of （）A
injection pump plungers stuck or wornB
low compressionC
solenoid stuck openD
fuel tank too full
考题
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
考题
单选题Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）A
Increased turbulenceB
increased mechanical efficiencyC
Increased brake mean effective pressureD
All of the above
考题
单选题Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）A
Ignition lag increasesB
Lube oil system pressure increasesC
Brake specific fuel consumption increasedD
Mechanical efficiency increaded
考题
单选题My ship’s engine responds well to telegraph orders and takes about 80 seconds to reverse from full speed ahead to full speed astern. This sentence（）.A
indicates the engine's particularsB
tells the engine's functionC
shows the engine's typeD
refers to the engine's information
考题
单选题A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an （）A
torque limiterB
over-speed tripC
over-speed governorD
load limit governor
考题
单选题A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.A
temperature of the exhaust gasesB
energy supplied to the turbochargerC
air pressure to the intake manifoldD
purge of exhausted gases from the cylinders
考题
单选题The diesel engine is a type of （）.A
turbine engineB
gas turbineC
steam engineD
internal combustion engine
考题
单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
a modern diesel engine；a turbine wheelB
a modem diesel engine；exhaust gasesC
a compressor；an exhaust gas turbochargerD
a compressor；a turbine wheel
考题
单选题If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.A
open；short；afterB
closed；short；afterC
open；long；beforeD
closed；long；before
考题
单选题Compared to a naturally aspirated diesel engine, a supercharged diesel engine has（）A
a cylinder air charge of higher pressureB
increased pumping lossesC
less valve overlapD
reduced blow-by
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On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.A
one engine ahead and one engine astern，with full rudderB
one engine ahead and one engine astern，with rudders amidshipsC
both engines ahead，with full rudderD
both engines astern，with full rudder
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