單項選擇題The minimum speed an engine must attain before ignition can occur depends upon （）.

A.the type and size of the engine
B.the condition of the engine
C.ambient temperature
D.all of the above


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1.單項選擇題For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

A.it has a longer power stroke
B.more air gets into the cylinder each stroke
C.it develops twice as many power strokes at the same speed
D.higher combustion pressure is developed

2.單項選擇題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

3.單項選擇題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

4.單項選擇題Combustion knock occurring in a diesel engine can be caused by （）.

A.excessive fuel penetration
B.prolonged injection lag
C.reduced ignition lag
D.prolonged ignition lag

5.單項選擇題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