问题：
[单选] Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.
intake stroke。exhaust stroke。power stroke。compression stroke。
问题：
[单选] Lube oil pumps taking suction from the sump of most small marine engines are usually （）.
of the diaphragm type。of the centrifugal type。of the positive displacement type。independently driven by electric motor。
问题：
[单选] A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
cylinder heads。exhaust valves。scavenging air。injector。
问题：
[单选] The total starting air capacity required for reversible main engines is to be sufficient for at least （）.
six consecutive starts。eight consecutive starts。ten consecutive starts。twelve consecutive start。
问题：
[单选] Most fuel injection nozzles are opened by （）.
fuel oil pressure。a cam operated follower。a spring-loaded pressure plate。timing gears keyed to the crankshaft。
问题：
[单选] A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）
slightly less than atmospheric pressure。approximately equal to exhaust manifold pressure at all times。that is widely fluctuating constantly。decreasing as engine load increase。
问题：
[单选] During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
ensure penetration and distribution of the fuel in the combustion chamber。ensure the needle valve is flushed clean during each injection。prevent combustion gas blowback into the open needle valve。prevent reflected pressure waves when the needle valve close。
问题：
[单选] The overspeeding of the diesel engine driving an electric generator could cause （）.
low voltage trip to trip。reverse power trip to trip。damage to windings。excessive exhaust temperature。
问题：
[单选] An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.
decrease in maximum cylinder pressure。increase in ignition lag。decrease in fuel consumption per horsepower-hour。decrease in exhaust manifold pressure。
问题：
[单选] For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because （）.
changing filter elements would not interrupt engine operation。filtering occurs twice in each pass of oil through the system。clogging will not occur。dropping pressure is half of that through a single filter unit。
