单项选择题

A viscous damper, as used on a marine diesel, is a sealed precision built device which dampens the torsional vibrations in the （）.

A.camshaft
B.flywheel
C.crankshaft
D.thrust shaft

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单项选择题
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
单项选择题
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
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