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单选题
（） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.
A
Too larger
B
Too smaller
C
Excess
D
Excessive
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Prevents lateral movement of the slow speed gearB
Transmits propeller thrust to the hullC
Keeps spring bearings in lineD
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单选题Worn main bearings in a diesel engine can result in （）A
decreased compression pressureB
increased lube oil pressureC
lower lube oil temperatureD
excessive leakage past the piston rings
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单选题（） is fully floating in both connecting rod small end and the piston skirt.A
The piston rodB
The cross head pinC
The gudgeon pinD
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单选题During check on top clearance in main bearings, turn the crankthrow for the relevant cylinder unit to （） and stop the lube oil circulating pump.A
port sideB
starboard sideC
BDC positionD
DC position
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单选题On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.A
banjo feedB
splash feedC
gravity feedD
pressure feed
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单选题The crank pin journal is provided with large bores for （）.A
lubricationB
coolingC
balancing purposeD
ventilation
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单选题The highest loads applied to the diesel engine crankshaft main bearings are （）A
axial loadsB
firing loadsC
inertia loadsD
centripetal loads
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单选题Which of the following may take place if the clearance of the main bearings are excessive?（）A
bearing knocksB
dropping of pressure of LOC
noisesD
all the above
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单选题Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.A
internal crankshaft passagesB
immersion in oilC
splash lubricationD
injection lubrication
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单选题Cold weather starting of a diesel engine is more difficult than warm weather starting due to（）A
use of low viscosity oil in cold weatherB
increased moisture content of inlet air in cold weatherC
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单选题The load limitation of governor should be reduced when ship navigating at sea, the main reason is to（）A
prevent the diesel engine surgingB
prevent governor from being damaged because of swingC
reduce the probability of the crank shaft being torsional vibrated and resonatedD
prevent the main engine being overload or overspeed
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单选题One method of determining crankshaft misalignment is by（）A
laying a straight edge across the crank webs at the crankpin and measuring the distance to the crankpin in two placesB
measuring the crank drop on either side of each crank throw while the crankshaft is slowly rotated through one revolutionC
rotating the crankshaft through one revolution, pausing each 90oof rotation to measure bearing clearances, top and bottomD
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单选题Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.A
loss of flow in the fuel systemB
loss of pressure in the air systemC
loss of flow in the lubricating systemD
loss of pressure in the lubricating system
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单选题On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.A
a spindle lubricatorB
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internal splashingD
drilled passages in the crankshaft
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单选题For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.A
a gravity tankB
a sumpC
a vesselD
a bottle
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单选题In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.A
reciprocating at the piston pin, rotary at the crank pinB
reciprocating at the crank pin, rotary at the piston pinC
straight reciprocationD
straight rotation
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单选题Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of （） to develop their full strength.A
the piston rodsB
the crank throwsC
the thrust bearingsD
the main bearings
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单选题Crank web deflection readings will give a positive indication of （）.A
worn main bearing journalsB
torsional stress deformationC
slack thrust bearingsD
bearing shells shim dimensions
考题
单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）A
BedplateB
BlockC
BaseD
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考题
单选题The crank chamber oil （）.A
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is a kind of detergent
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6-pin PCI connectorB
24-pin connectorC
Molex connectorD
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