单项选择题
Lube oil cannot be efficiently filtered if its （）.
A.viscosity is too low
B.temperature is too low
C.pump discharge pressure is higher than the systems pressure
D.pump capacity is greater than the systems needs
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In using reduction gears to obtain efficient propeller speeds, （）.
A.they must be located at the after end of the engine
B.they can only be used with one engine at a time
C.they eliminate the need for controllable pitch propellers
D.they are connected to the engine with a flexible coupling -
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A.excessive fuel penetration
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C.reduced ignition lag
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A thrust bearing is used with a propulsion diesel engine to （）.
A.control axial movement of the crankshaft
B.transmit engine thrust to the propeller shaft
C.absorb vibrations in the propeller shafting
D.prevent propeller thrust from being transmitted to the hul
