Large crosshead type engine generally has two lubrication systems, a function performed only by crankcase oil system is（）

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• A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）

  A、the use of a poor quality oil B、the deterioration of its properties C、the formation of deposits D、the reduction in heat transfer ability

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• The main function of tie rods in the construction of large, low speed diesel engines is to（）.

  A . stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength B . accept most of the tensile loading that results from the firing forces developed during operation C . mount the engine frame securely to the hull to prevent shaft coupling misalignment D . connect the crosshead solidly to the piston rod

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• Trunk type diesel engine pistons are effectively cooled when heat is（）

  A . radiated through the engine block B . transferred to water cooled cylinder walls C . conducted through the piston crown D . transferred to escaping exhaust gase

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• Today, crankshafts for large 2-stroke crosshead engines are of the （）type.

  A . semi-built B . built-up C . solid forged D . individual forged

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• Smaller engines can be made more rigid than large ones and may not have （）.

  A . through bolts B . turbo-chargers C . bed plates D . colum

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• One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.

  A . casting interlocking components B . welding plates to form sections for assembly C . forging integral components D . case hardening integral component

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• Large crosshead type engine generally has two lubrication systems, a function performed only by cylinder oil system is（）

  A . lubricating B . cooling C . sealing D . cleaning

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• Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.

  A . cylinder liners and piston rings B . main bearings C . crankpin bearings D . turboblower

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• Which of the following procedures should be carried out to permit the use of a crosshead engine with an inoperable after-cooler?（）

  A . Bypass the after-cooler to operate at speed B . Run at reduced speed until the cooler can be repaired or renewed C . Switch to diesel fuel and run at full speed D . Nothing need to be done due to the low heating value of heavy fuel

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• In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.

  A . reciprocating at the piston pin, rotary at the crank pin B . reciprocating at the crank pin, rotary at the piston pin C . straight reciprocation D . straight rotatio

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• Cast iron pistons used in large propulsion diesel engines are constructed with （）

  A . not taper what so ever B . the skirt being tapered and smaller than the crown C . the skirt being tapered and larger than the crown D . the crown being tapered and smaller than the skirt

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• 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 . injector

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• （） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.

  A . The medium speed 4-stroke trunk piston engine B . The low speed 2-stroke crosshead engine C . The medium speed 2-stroke crosshead engine D . The low speed 4-stroke trunk piston engine

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• The diesel engine is a type of （）.

  A、A. turbine engine B、B. gas turbine C、C. steam engine D、D. internal combustion engine

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• Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.

  A . fuel oil vapor at the sludge tank vent B . unburned fuel vapors in the scavenge air receiver C . lube oil vapors in the crank case D . lube oil vapors in the engine room

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• Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）

  A . increase back pressure during the exhaust process B . facilitate periodic replacement of the valves C . reduce the pumping loss associated with scavenging D . reduce tension on valve spring

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• In some modern large diesel engines, which of the following is used as the support for the main bearings?（）

  A . Bedplate B . Block C . Base D . Sum

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• On a large diesel engine installation, crankshaft axial alignment is maintained by the （）

  A . piston rod guides B . engine thrust bearing C . crosshead bearing D . main shaft flexible coupling

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• 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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• 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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• Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）

  A . cooling water leaving each cylinder B . fuel oil entering the injector C . exhaust gases at various locations D . lube oil at the bearing supplie

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• There are three types of large arteries, elastic arteries and small arteries.

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