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A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）
A、the use of a poor quality oil
B、the deterioration of its properties
C、the formation of deposits
D、the reduction in heat transfer ability
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The main function of tie rods in the construction of large, low speed diesel engines is to（）.
A . stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength
B . accept most of the tensile loading that results from the firing forces developed during operation
C . mount the engine frame securely to the hull to prevent shaft coupling misalignment
D . connect the crosshead solidly to the piston rod
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In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.
A . inefficiency
B . oiliness
C . detergency
D . purity
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One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.
A . casting interlocking components
B . welding plates to form sections for assembly
C . forging integral components
D . case hardening integral component
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Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.
A . cylinder covers
B . lubricating space
C . crosshead
D . exhaust manifold
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Turbocharging of marine diesel engine is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
A . respectable
B . respectful
C . respective
D . respectively
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One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）
A . reduce lube oil temperature
B . raise exhaust temperature reduce
C . excessive heating of engine room
D . reduce load on cooling water pum
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Cast iron pistons used in large propulsion diesel engines are constructed with （）
A . not taper what so ever
B . the skirt being tapered and smaller than the crown
C . the skirt being tapered and larger than the crown
D . the crown being tapered and smaller than the skirt
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A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
A . cylinder heads
B . exhaust valves
C . scavenging air
D . injector
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The following preparations are essential for any （） of marine diesel engine before it may be started.
A . doing
B . make
C . turn
D . operating
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（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.
A . Except for
B . Beside
C . Except
D . In addition to
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Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.
A . internal crankshaft passages
B . immersion in oil
C . splash lubrication
D . injection lubricatio
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Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
A . fuel oil vapor at the sludge tank vent
B . unburned fuel vapors in the scavenge air receiver
C . lube oil vapors in the crank case
D . lube oil vapors in the engine room
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Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）
A . increase back pressure during the exhaust process
B . facilitate periodic replacement of the valves
C . reduce the pumping loss associated with scavenging
D . reduce tension on valve spring
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In some modern large diesel engines, which of the following is used as the support for the main bearings?（）
A . Bedplate
B . Block
C . Base
D . Sum
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Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）
A . a combination of constant volume and constant pressure
B . a combination of constant temperature and constant pressure
C . entirely constant pressure
D . entirely constant volume
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Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.
A . spark plugs
B . glow plugs
C . heat of compression
D . a magneto
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On a large diesel engine installation, crankshaft axial alignment is maintained by the （）
A . piston rod guides
B . engine thrust bearing
C . crosshead bearing
D . main shaft flexible coupling
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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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Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）
A . decrease the time required between cleanings
B . removes all large and small foreign objects
C . ensure a positive flow of oil at all times
D . ensure that all lube oil has been treated twice
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Cylinders of marine diesel engines are normally cooled by （）.
A . sea water
B . fine mineral oil
C . sanitary water
D . fresh water
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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 . lead
B . forged steel
C . alloy steel
D . aluminum alloy
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Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）
A . cooling water leaving each cylinder
B . fuel oil entering the injector
C . exhaust gases at various locations
D . lube oil at the bearing supplie
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The marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.
A.principle
B.principal
C.cause
D.case
