單項選擇題

A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPMWhat is the speed reduction ratio?（）

A.030 to 1
B.300 to 1
C.333 to 1
D.330 to 1

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單項選擇題

High diesel engine cooling water temperatures can be caused by （）.

A.air in the cooling system
B.an overhauled water pump
C.correct amount of coolant
D.no air in the cooling system

單項選擇題

The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.

A.camshaft
B.reduction gears
C.rocker arm
D.connecting or piston rod

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