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单选题
You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）
A
large dirt particles in the oil supply
B
insufficient lubricating oil and overheating
C
normal wear
D
water contamination of the lube oil
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主甲板以下是二层甲板。（）A、The deck below the lower deck is known as ‘tween deck.B、The deck below the main deck is known as ‘tween deck.C、The deck above the main deck is known as ‘tween deck.D、The deck below the lower deck is known as main deck.
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The deck from bow to stern is called the （）(主甲板).A、main deckB、tweendeckC、upper deckD、lower deck
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甲板分为艏楼甲板，主甲板和艉楼甲板。（）A、The deck is divided into forecastle deck, main deck and poop deck.B、The deck is divided into forecastle deck, lower deck and main deck.C、The deck is divided into forecastle deck, main deck and lower deck.D、The deck is divided into main deck, lower deck and poop deck.
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单选题On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）A
dial indicatorB
outside caliperC
bridge gaugeD
tram rod
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单选题What is the function of the thrust bearing?（）A
Prevents lateral movement of the slow speed gearB
Transmits propeller thrust to the hullC
Keeps spring bearings in lineD
Prevents main reduction gear axial movement
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单选题Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.A
clearanceB
crushC
pitchD
thrust
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单选题You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced? （）A
RelativeB
TRUEC
CompassD
Magnetic
考题
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
考题
单选题甲板分为艏楼甲板，主甲板和艉楼甲板。（）A
The deck is divided into forecastle deck, main deck and poop deck.B
The deck is divided into forecastle deck, lower deck and main deck.C
The deck is divided into forecastle deck, main deck and lower deck.D
The deck is divided into main deck, lower deck and poop deck.
考题
单选题The highest loads applied to the diesel engine crankshaft main bearings are （）A
axial loadsB
firing loadsC
inertia loadsD
centripetal loads
考题
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
考题
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 largerB
Too smallerC
ExcessD
Excessive
考题
单选题Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or capsThe installation process of these bearings requires sufficient （）.A
overlapB
crushC
lap or leadD
protrusion
考题
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
考题
单选题Based on your 2209 fix，which would be a warning that you are being set down on Block Island Sound South Entrance Obstruction Lighted BIS Buoy? （）A
Decreasing loran readings on 9960-WB
Visual bearings of Montauk Point Lt. changing to the leftC
Increasing bearings of Southeast Point LightD
Decreasing soundings
考题
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
考题
单选题While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）A
the bearing had been overheatedB
water was present in the oilC
the lube oil was not being properly filteredD
the maximum allowable bearing pressure had been exceeded
考题
单选题While inspecting the steering system at sea, you should check for （）.A
air bubbles in the sight glassB
any leaks in the systemC
over-travel in the rudder angle indicatorD
lost motion in the rams
考题
单选题Just after stopping the engine while the oil is still circulating.Check that uniform oil jets appear from all the oil outlet grooves in the crosshead bearing lower shell and the guide shoes.The oil flow from （） must be compared from unit; there should be a similarity in the flow patterns.A
the piston cooling oil return pipesB
the main and crankpin bearingsC
thrust and intermediate bearingsD
stern tube and thrust bearings
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
Sump
考题
单选题主甲板以下是二层甲板。（）A
The deck below the lower deck is known as ‘tween deck.B
The deck below the main deck is known as ‘tween deck.C
The deck above the main deck is known as ‘tween deck.D
The deck below the lower deck is known as main deck.
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