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单选题
In a full flow type lube oil system, the bypass relief valve will lift due to （）
A
a clogged filter element
B
excessive lube oil pump discharge pressure
C
excessive lube oil flow
D
excessively hot lube oil
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six-way valve shifts to the neutral flow positionC
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单选题A substantial increase pressure could be an indication of a/an （）A
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The six-way valve opensB
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单选题A substantial increase in crankcase pressure could be an indication of （）A
excessive lube oil pressureB
the proper seating of new ringsC
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单选题Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.A
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单选题Refrigeration system compressor crankcase sweating is an indication of （）.A
insufficient lube oil circulating through the systemB
excessive circulation of lube oil through the systemC
insufficient refrigerant in the systemD
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单选题What type of valve is used to direct the flow of hydraulic fluid?（）A
Relief valveB
Direction control valveC
Stop valveD
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单选题Excessive lubricating oil consumption in a running diesel engine can be caused by （）A
clogged lube oil pipingB
excessive valve-guide clearanceC
high lube oil viscosityD
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单选题In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.A
lube oil pump suction lineB
lube oil pump discharge lineC
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单选题Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.A
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单选题Unlike the globe valve, gate valves give full bore flow without change of direction, such a valve is not suitable to partially open operationAccording to the above sentence, which of the following statements is not true?（）A
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The globe valve will give full bore flow with change of directionC
The gate valve gives full bore flow with change of directionD
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考题
单选题Worn diesel engine intake valve guides can result in （）A
increased engine breathing efficiencyB
excessive valve lashC
excessive lube oil consumptionD
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单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.A
the relief valve should open before the high pressure cutoutB
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单选题A lube oil sample taken from the main engine lube oil system has dark yellow opaque color.This is the result of （）A
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overheatingD
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考题
单选题Overflow valve is used to （）A
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单选题Moisture in the refrigerant may （）.A
freeze on the expansion valve seat and reduce the flow of liquid refrigerantB
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单选题Which of the following problems will occur if a disk-type centrifugal lube oil purifier is not properly primed prior to admitting oil flow to the bowl?（）A
Contamination of the lube oil by emulsification will resultB
The lube oil will not be subjected to the proper centrifugal forceC
The lube oil will overheat and flashD
Oil will discharge from the heavy phase discharge port and be wasted
考题
单选题A condition that can increase the foaming tendency of lube oil is （）A
excessively high oil temperaturesB
water or moisture contaminationC
fuel dilutionD
life its cylinder relief vales
考题
单选题Lube oil in the fresh water cooling system of a diesel engine may result from a （）A
camshaft seizureB
lube oil pump failureC
lube oil cooler failureD
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考题
单选题When fuel enters the crankcase of a diesel engine, it （）A
dilutes the lube oil and reduces its viscosityB
forms sulfuric acid in the lube oilC
causes pitting and failure of the bearingsD
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考题
单选题Sludge formation in a diesel engine lube oil system is caused by（）A
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coagulation of unburned fuel below the piston ringsD
all of the above
考题
单选题Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）A
decrease the time required between cleaningsB
removes all large and small foreign objectsC
ensure a positive flow of oil at all timesD
ensure that all lube oil has been treated twice
考题
单选题In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.A
Globe valveB
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单选题Which of the following faults would allow lube oil to enter the cooling system of a diesel engine?（）A
Excessive valve train lubricationB
Leaking standby oil cooler coreC
Excessive lube oil pressureD
Excessive lube oil in the system
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