單項選擇題Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）

A.jam in the most worn part of the cylinder when the rings expand
B.break in the most worn part of the cylinder when the rings expand
C.wear eccentrically on the side opposite the end gap
D.overheat and jam at the top center on the combustion stroke


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1.單項選擇題Before being shut down, a diesel engine should idle a few minutes in orderto （）

A.prevent governor surging at shutdown
B.make sure the fuel nozzles are flushed clean
C.prevent pressure buildup in the fuel lines
D.prevent damage from localized overheating

2.單項選擇題The main propulsion diesel continues running after you try to shut downYoushould now attempt to（）

A.stop the combustion air supply
B.engage the jacking gear
C.secure the lube oil pump
D.shut off the fuel at the day tank

3.單項選擇題Cylinder linings constructed as an integral part of the block, are characterized by which of the following disadvantages?（）

A.They conduct heat poorly
B.They are expensive
C.They cannot be replaced
D.They require special tools for removal

4.單項選擇題When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）

A.The diesel oil must never be allowed to mix with the heavy fuel
B.The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve
C.The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve
D.The heating steam must be secured before the diesel oil passes through the three-way valve

5.單項選擇題Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）

A.To prevent internal damage form local overheating
B.To ensure the fuel nozzles are flushed clean
C.To clear the smoke stack
D.To let the waste heat boiler reduce its rate of steam generation