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【单选题】

Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）

A、decrease the time required between cleanings

B、removes all large and small foreign objects

C、ensure a positive flow of oil at all times

D、ensure that all lube oil has been treated twice

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更多“Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）”相关的问题
第1题
[单选题] A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）

A、low TBN value  B、high alkaline reserve  C、low flash point  D、high pour point  

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第2题
[单选题] The most practical way of detecting an overload in one cylinder of an operating large, low-speed ,main propulsion diesel engine is to （）

A、check the cylinder exhausts for black smoke  B、listen for combustion knock in that cylinder  C、isolate each cylinder and inspect the injector  D、check the cylinder exhaust temperature frequently  

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第3题
[单选题] 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  

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第4题
[] The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.

A、A.large conical springs  B、B.compressed air pressure  C、C.hydraulic pressure  D、D.exhaust gas pressure  

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第5题
[单选题] On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）

A、dial indicator  B、outside caliper  C、bridge gauge  D、tram rod  

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第6题
[单选题] Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）

A、Electric  B、Hydraulic  C、Air  D、All of the above  

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第7题
[单选题] Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）

A、Plugged injector nozzles  B、Excessive fuel injection  C、Very late injection timing  D、Incorrect crankshaft clearance  

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第8题
[] In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）

A、A.top of the ring groove  B、B.back of the ring groove  C、C.bottom of the ring groove  D、D.piston ring end clearance  

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第9题
[单选题] The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

A、direct action of cam shaft  B、compressed air pressure  C、hydraulic “push rods”  D、direct action of the main piston moving down  

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