【名词&注释】
螺旋桨(propeller)、机械设备(mechanical equipment)、饱和度(saturation)、船舶动力装置(marine power plant)
[单选题]下述关于机舱饱和度ks和kv的说明,哪一项是错误的()。
A. ks和kv大表示机舱内机械设备布置得紧凑,利用程度高
B. ks和kv小表示机舱利用程度差
C. ks和kv小时,机舱的通风、散热差,管理维修不方便
D. 应保证动力装置正常工作和维修条件下,选取较大的ks和kv值
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学习资料:
[单选题]船舶动力装置(marine power plant)的主要耗能设备是()。Ⅰ.螺旋桨;Ⅱ.主机、发电机和辅助锅炉;Ⅲ.空气压缩机
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ+Ⅲ
[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]() is used for washing and drinking.
A. The ballast system
B. The salt water system
C. The bilge system
D. The domestic system
[单选题]A separate piston cooling system is used to limit any contamination () piston cooling glands() the piston cooling system only.
A. between;to
B. either;or
C. from;to
D. neither;nor
[单选题]The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed ().
A. nip
B. nap
C. gap
D. li
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