问题：
[单选] If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.
cylinder compression pressure may not be high enough。cylinder compression temperature may be too high。fuel oil injection pressure may not be high enough。scavenge and purge process is incomplete。
问题：
[单选] Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）
Defective temperature controls in the system。Cavitation in the cooling water pump。Opened vent in the cooling system。Restricted water passages in the engine。
问题：
[单选] An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is （）
holed。fouled。clean。dry。
问题：
[单选] A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.
double-acting engine。opposed pistons engine。single-acting engine。horizontal acting engine。
问题：
[单选] To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.
reduce the engine driven fuel pump outlet pressure。retard the fuel injector timing to reduce power。increase the fuel rack setting。reduce the load on the engine。
问题：
[单选] Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
Exhaust and scavenging。Scavenging and compression。Ignition and expansion。Exhaust and compressio。
问题：
[单选] Diesel engine control can be obtained by the bridge （）.
at any time。only after the engine room control station is switched to “bridge control”。whenever the secondary station is switched to "bridge control"。with the approval of the chief engineer only。
问题：
[单选] Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
a shortened ignition delay period。a lean fuel/air mixture。excess fuel in the combustion chamber。rapid vaporization of injected fuel droplet。
问题：
[单选] Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.
wheelhouse control station。engine room control station。captains office。chief engineers office。
问题：
[单选] A thrust bearing is used with a propulsion diesel engine to （）.
control axial movement of the crankshaft。transmit engine thrust to the propeller shaft。absorb vibrations in the propeller shafting。prevent propeller thrust from being transmitted to the hul。
