單項(xiàng)選擇題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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1.單項(xiàng)選擇題The intake valves in a diesel engine are reseated by ().

A.cam followers
B.push rods
C.combustion gases
D.valve springs

2.單項(xiàng)選擇題The outlet from an expansion tank of a closed freshwater cooling system should be piped to the ().

A.cylinder head water outlet header
B.cylinder jacket inlet main
C.heat exchanger inlet connection
D.jacket water pump suction line

3.單項(xiàng)選擇題Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the ().

A.main bearings
B.connecting rod bearings
C.piston pin bushings
D.All of the above

4.單項(xiàng)選擇題After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the ().

A.furnace to be re-purged
B.electric charge to buildup in the igniter
C.fuel pump to restart
D.dram level to stabilize

5.單項(xiàng)選擇題Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the ().

A.air charge density becoming too high
B.piston crown surfaces becoming too cold
C.formation of excessive quantities of condensate
D.compression pressure being greatly reduced