If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）

A . must be centrifuged B . must by filtered C . must be changed D . is holding finely dispersed carbon in suspensio

A . decrease until the engine speed increases B . increase as the load increases C . decrease as the load D . increases remain unchanged

A . place standby cooler in operation B . reduce engine load C . check thermostatic valve D . clean sea water strainer

A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

A . low compression temperature B . low ambient air pressure C . high lube oil pump pressure D . high fuel oil booster pump pressure

A . a low level in the engine expansion tank B . excessively high coolant pressure C . improper temperatures D . malfunctioning of the jacket water heater

A . too light of a load B . injection timing is too early C . overloading of the engine D . too low of a compression ratio

A . fuel will not be properly atomized in the cylinder B . ignition will be delayed due to low ignition temperature C . maximum fuel expansion will occur on the compression stroke D . fuel will ignite before top dead center

A . open the bypass line B . cut in the lube oil cooler C . pressurize the lube oil system D . top off the expansion tank

A . fuel control rack had admitted excessive fuel B . engine speed does not match the fuel rack setting C . engine has failed to reach its firing speed D . starter pinion and ring gear contact is not correct

A . discharge a CO extinguisher in the air inlet B . pull off the distributor cap C . secure the jacket water D . secure the starting air supply valve

A . a cracked cylinder head B . a leaky cylinder head gasket C . a cracked cylinder liner D . any of the above

A . speed will drop drastically with any increase in load B . will stop due to zero fuel supply C . will stall upon application of load D . speed will remain fairly constant despite load change

A . air intake is restricted B . engine is cranked too fast C . vibration dampener is faulty D . exhaust back pressure is low

A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

A . immediately open all crankcase relief ports B . increase crankcase exhauster speed to draw cool air into the engine C . allow the engine to cool naturally D . increase crank case scavenge air to remove unburned gase

A . low exhaust back pressure B . early fuel injection in one of the cylinders C . compression pressure in one of the cylinders D . plugged injector hole

A . excessive compression pressure B . air in the fuel lines C . high fuel pressure D . excessive load

A . liquid in the cylinder B . low compression in the cylinder C . high exhaust temperature D . poor fuel penetratio

A . fuel droplets will burn as they leave the fuel injector B . fuel will not be properly atomized in the cylinder C . maximum expansion of the burned fuel cannot take place in the cylinder D . compression pressure will be too low to cause fuel ignitio

A . compression pressures are below normal B . lube oil is diluted with fuel oil C . cranking speed is too low D . exhaust system is partially restricted

A . filter to remove the fuel oil B . use the settler to remove the fuel oil C . remove the fuel oil by centrifuging D . drain and then renew the lube oil supply

A . cross-head B . cylinder C . connecting rod D . spark plug

A.stop the engine immediately to prevent damage B.increase lube oil pressure C.slow the engine allowing it to gradually cool D.decrease the cooling water it temperature to the water jacket