單項(xiàng)選擇題Setting a sealing equipment astern on the tailshaft can’t （）

A.prevent the seawater from intergrating
B.prevent the lube oil from running out of the outside aboard
C.strengthen the intencity of the sterntube
D.prevent the mud and sand from entering the lube oil system


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1.單項(xiàng)選擇題In the process of the shafting management, special attention should be paid to（）

A.on the sailing, the water in the aft peak tank should be excluded as much as possible
B.the stuffing style ahead sealing shouldn’t have any water leaking out
C.Simplex astern sealing shouldn’t have any oil leaking out
D.Simplex ahead sealing can have some oil leaking out

2.單項(xiàng)選擇題The main advantage of improved Simplex tailshaft seal are（）

A.the good sealing performance and the simple structure
B.the good sealing performance and the short life expectancy
C.the good sealing performance but the short life expectancy
D.the good sealing performance and the lower cost

3.單項(xiàng)選擇題Simplex tailshaft seal equipment’s working condition is terribleThe main cause is （）

A.the shafting’s vertical vibration
B.violent friction and sea water corrosive
C.friction and high temperature
D.violent friction and high temperature

4.單項(xiàng)選擇題The center line condition of the transmission shaft can be checked by（）

A.the border flange’s excursion and flection
B.the both end shafts line’s accordance
C.the border flange’s flection and the both end shafts line’s accordance
D.the border flange’s accordance and both end shafts flection degree

5.單項(xiàng)選擇題In the navigation（） cause the shafting over load easily.

A.the stopping engine suddenly
B.the sailing astern and changing direction suddenly
C.the sailing from the shallow water area to the deep water area
D.the ship’s trim too much