【名词&注释】
可达性(accessibility)、螺旋桨(propeller)、动力装置(power plant)、填料函(stuffing box)、活塞杆填料、有效热效率(effective thermal efficiency)
[单选题]可达性越好,维修性就越好。可达性是指在维修作业中对()的难易程度。Ⅰ.产品内部进行修理操作;Ⅱ.插入工具;Ⅲ.更换零部件
A. 仅Ⅰ
B. Ⅰ+Ⅱ
C. Ⅰ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ
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学习资料:
[单选题]动力装置有效热效率(effective thermal efficiency)是指()。Ⅰ.每小时螺旋桨推力功的相当热量与同一时间内动力装置消耗的燃油完全燃烧所发出的总热量之比Ⅱ.3600kJ与动力装置每千瓦小时所消耗燃油(燃油消耗率的燃油)的热量之比
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ,Ⅱ都对
D. Ⅰ,Ⅱ都不对
[单选题]废气锅炉出口排烟温度t2不应低于露点,为了最大限度利用排气余热,在标定工况下,t2=露点+△t(℃),式中△t不应小于()℃.
A. 25
B. 30
C. 40
D. 50
[单选题]活塞杆填料函安装在气缸底板中心孔中,具有()的作用。Ⅰ.密封扫气空气;Ⅱ.密封燃气;Ⅲ.除油污;Ⅳ.除积炭;Ⅴ.分隔。
A. A.Ⅰ+Ⅱ+Ⅴ
B. B.Ⅰ+Ⅴ
C. C.Ⅱ+Ⅴ
D. D.Ⅰ+Ⅲ+Ⅴ
[单选题]在水平平面内,当曲柄的两个主轴承位置偏左,曲轴轴线呈左弧线弯曲(即呈“(”形)时,该曲柄的臂距差Δ-为()值。
A. 正
B. 负
C. 零
D. 正或零
[单选题]The cylinder covers and the liners are bolted together by means of ().
A. bolts welded into the cylinder head
B. bolts welded into the cylinder frames
C. studs screwed into the cylinder head
D. studs screwed into the cylinder frame
[单选题]To prevent the build up of high stresses engine must not be run continuously ().
A. faster than dead slow speed
B. slower than dead slow speed
C. with the output of MCR
D. at critical speed
[单选题]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve ()
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单选题]The crankcases of many diesel engines are kept under a slight vacuum to ()
A. improve fuel economy
B. increase the air charge velocity
C. reduce the risk of explosion
D. all of the above
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