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單項選擇題

Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.

A.above
B.at
C.over
D.within

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Before replacing a piston you should check that all rings are （）.
A.free
B.fastened
C.broken
D.stuck
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Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.
A.the indicators
B.the starting valves
C.the cylinder lubricators
D.the turning gear
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Before being used the fuel service tank should be drained of （）.
A.soda solution
B.mechanical impurities
C.ballast
D.water and residuals
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Before a marine diesel engine is started the cylinders and pistons must be （）.
A.cooled to appropriate temperature
B.warmed up gradually to appropriate temperature
C.opened up and renewed
D.ground and polished
單項選擇題
Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.
A.a brief trial with turning gear
B.a brief trial on power
C.a long trial by steering gear
D.one minutes trial with windlass
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Bedplates are the （） of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.
A.hull
B.projection
C.graphitization
D.foundation
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Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.
A.the column
B.the jacket
C.cylinder cover
D.cylinder liner
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Bearing knocks are likely to occur from （）.
A.less clearance
B.dirty lube oil
C.overload
D.bearing wear
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Be sure to make the engine turn by （） before starting and after stopping .
A.steering gear
B.turning gear
C.steering wheel
D.turning cycle
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At the top of the A-frames there is a strong cast iron frame called （）.
A.cylinder liner
B.cylinder cover
C.the gear box
D.the scavenging box

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