單項選擇題The total starting air capacity required for reversible main engines is to be sufficient for at least （）.

A.six consecutive starts
B.eight consecutive starts
C.ten consecutive starts
D.twelve consecutive starts


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1.單項選擇題A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.

A.cylinder heads
B.exhaust valves
C.scavenging air
D.injectors

2.單項選擇題Lube oil pumps taking suction from the sump of most small marine engines are usually （）.

A.of the diaphragm type
B.of the centrifugal type
C.of the positive displacement type
D.independently driven by electric motors

3.單項選擇題Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.

A.intake stroke
B.exhaust stroke
C.power stroke
D.compression stroke

4.單項選擇題Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.

A.excessive crankcase pressure
B.excessive lube oil temperature
C.contamination of the lube oil by water
D.contamination of the cooling water by lube oil

5.單項選擇題The water in an auxiliary boiler should be tested daily for （）.

A.dissolved oxygen
B.chlorides
C.sludge
D.dissolved nitrogen