【名词&注释】
不可靠度(unreliability)、气缸中心线
[单选题]如果某海区每年发生大风浪的概率Pw=0.25,某船每年经过该海区航行的概率Pv=0.1,该船航行不可靠度为F(t)=0.20,则该船在该海域遇险的概率P()为。
A. 0.0045
B. 0.9955
C. 0.8520
D. 0.005
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学习资料:
[单选题]测量发现,活塞在气缸中发生倾斜,即活塞位于近上、下止点位置时,活塞在气缸中分别偏向一侧,活塞与气缸左、右方向上的间隙不等,这是由于()原因造成的。
A. A.导板发生上下方向倾斜
B. B.导板发生左右方向倾斜
C. C.导板与气缸中心线距离过大或过小
D. D.滑块与活塞中心线距离过大或过小
[单选题]关于臂距值L,不正确的说法是()。
A. 根据臂距值可以计算臂距差
B. 曲柄销在上止点位置的臂距值记为L上
C. 曲柄销在左平位置的臂距值记为L左
D. 测量点距曲柄销中心线越近,所测的L值越大
[单选题]舵杆纵向裂纹应采用()修理。
A. 修刮
B. 焊补
C. 粘接
D. 更换
[单选题]Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine () ahead and astern.
A. a brief trial with turning gear
B. a brief trial on power
C. a long trial by steering gear
D. one minutes trial with windla
[单选题]In a four-stroke engine the camshaft rotates at ().
A. half the engine speed
B. twice the engine speed
C. the engine speed
D. four times the engine speed
[单选题]Put in the engine turning gear Now examine thoroughly inside the crankcase to () that everything is correct.
A. make sure
B. be sure
C. assure
D. believe
[单选题]The most important factor that causes the wear of the engine parts is ().
A. excessive heat
B. friction
C. oxidation
D. high pressure
[单选题]A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST ().
A. reduce the engine load
B. increase the cooling water flow
C. increase the lube oil pressure
D. adjust the fuel rack
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