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单选题
The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.
A
two-stroke
B
four-stoke
C
long-stroke
D
short-stroke
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单选题Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.A
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medium-speed dieselC
high-speed dieselD
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单选题（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.A
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考题
单选题The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）A
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单选题Each cylinder liner on the marine medium speed engines （）.A
is usually cooled by sea waterB
can be replaced when worn outC
is in direct contact with the water in the bore of the cylinderD
can t expand when heated
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of trunk piston typeC
of low speed typeD
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To reduce the main engine speedB
To increase the main engine speedC
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crankcaseB
cylinder headC
valve coverD
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keeps constant at all engine speed, independent of the engine speedD
is decided by the engine speed, constant at all engine speed
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Sight feed lubricatorsD
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hard startingB
excessive fuel consumptionC
loss of powerD
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below 300B
above 1200C
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考题
单选题If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）A
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decrease as the loadD
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单选题Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.A
leadB
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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
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单选题Most medium and slow speed diesels are started by what medium?（）A
Electric starting motorsB
HydraulicsC
Compressed airD
Ether
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