【名词&注释】
不合格(unqualified)、国内外、中心线(center line)、充分利用(make full use)、中央冷却系统(central cooling system)
[单选题]要充分利用排气余热而降低废气锅炉出口温度t2,同时还应保证锅炉受热面必需的温度,该温差是()。Ⅰ.排气与给水的温度t2-tw;Ⅱ.排气与蒸汽的温度t2一ts
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ或Ⅱ对
D. Ⅰ+Ⅱ
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[单选题]假设某-中央冷却系统(central cooling system)中设有三台循环水泵,若在寒带水域时,只有一台水泵工作就可以满足冷却需要,则三台水泵之间从可靠性角度考虑则是()。Ⅰ.并联关系;Ⅱ.申联关系
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ,Ⅱ都对
D. Ⅰ,Ⅱ都不对
[单选题]目前国内外均以(S+D)/2为测量点A制定臂距差标准,若在大于(S+D)/2处的B点测量,则臂距差ΔB必定()。
A. >ΔA
B. =ΔA
C. <ΔA
D. ≥ΔA
[单选题]平台检验舵杆中心线与舵承孔中心线同轴度不合格时,应采取()措施修复。
A. 偏镗舵承孔
B. 重新定位舵杆
C. 研磨舵杆与舵叶的配合面
D. 指针法
[单选题]“The engine not obtaining the sufficient speed for firing” means that ().
A. the start fails
B. the fuel pumps will be put into operation
C. the fuel valves are damaged
D. the combustion process will take over
[单选题]When the fuel oil is burning in the combustion chamber, it ().
A. gives up large amount of heat
B. gives off large amount of heat
C. gives up large amount of steam
D. gives off large amount of steam
[单选题]In the closed cooling system, the water ().
A. is made to circulate out of the system
B. is made to circulate within the system
C. is made circulate within the system
D. is made circulate out of the system
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