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单选题
For a generator engine, after passing through the turbine the exhaust gas may be conducted out into the （）.
A
intercooler
B
open air
C
oil fired boiler
D
B and C
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单选题Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）A
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单选题The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.A
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on the outgoing tideB
overboard after darkC
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settling tankB
service tankC
ballast tankD
drain tank
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单选题When fuel is injected in a diesel engine cylinder too early, （）A
ignition may be delayedB
fuel economy is not affectedC
exhaust gas temperature will be unchangedD
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单选题The forced draught fan should be started and air passed through the furnace for several minutes to “（）” it of any exhaust gas or oil vapors.A
blowB
cleanC
scavengeD
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单选题In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.A
the beveled edges of the intake valves provide for serf-centering during seatingB
intake valves utilize stellite-coated valve seat inserts which reduce wearC
the volume of air passing through intake valves is less than the volume of air passing through exhaust valvesD
intake valves are less affected to the corrosive action of exhaust gases
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单选题"Scavenging" on a diesel engine means （）.A
injecting fuel oil into a cylinderB
removing exhaust gases from the cylinderC
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单选题Which of the following operating procedures should be carried out immediately after any diesel engine is started?（）A
Take all exhaust temperature readingB
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Verify proper lube oil pressureD
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单选题What is the function of the after-cooler installed in the diesel engine air intakes system?（）A
Decrease the air densityB
Increase the exhaust temperatureC
Decrease the lube oil temperatureD
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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
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a modem diesel engine；exhaust gasesC
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考题
单选题A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）A
increasing the linear velocity of the exhaust gasesB
changing directions of exhaust gas flowC
decreasing the temperature of the exhaust gasesD
accelerating the exhaust gas through a reduced size orifice
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单选题The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.A
wheneverB
howeverC
whereverD
whether
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单选题An auxiliary diesel engine may fail to start due to（）A
low exhaust back pressureB
high lube oil temperatureC
insufficient cranking speedD
excessive fuel atomization
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单选题Diesel engine mufflers or silencers reduce the engine exhaust noise by （）A
passing the exhaust through long head pipesB
diffusing exhaust vibrations through activated carbon bafflesC
increasing the exhaust gas velocityD
reducing the exhaust gas velocity
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单选题In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.A
produce a scavenging effect in the combustion spaceB
equalize cylinder and exhaust manifold pressuresC
alleviate the difference in valve size between the intake and exhaustD
flush out condensate that collects after each compression stroke
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单选题In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.A
the fuel oilB
the lubricating oilC
the refrigerating oilD
the hydraulic oil
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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
考题
单选题After passing through the turbine the exhaust gas is conducted out into the（）.A
intercoolerB
compressorC
cylinderD
open air
考题
单选题Diesel engine exhaust noise can be reduced in an exhaust muffler by （）A
changing the direction of exhaust gas flowB
increasing the exhaust gas velocityC
changing the exhaust gas weightD
increasing the exhaust gas static pressure
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