【名词&注释】
柴油机(diesel engine)、发电机、使用情况(service condition)、固定式(fixed)、不允许(not allow)
[单选题]轴带发电机和柴油发电机相比具有的优点是()。Ⅰ.油耗低;Ⅱ.维护费少;Ⅲ.机舱噪声低
A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ
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学习资料:
[单选题]并联连接系统按照部件的连接情况可分为备用部件和基本部件,根据使用情况有()。Ⅰ.固定式连接热态(在负荷下)各用方式;Ⅱ.固定式连接冷态(在无负荷下)各用方式;Ⅲ.不固定式(流动式)连接各用方式
A. Ⅰ十Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ
[单选题]不允许(not allow)柴油机排气恶化,防止锅炉烟垢沉积,其措施是()。
A. 保持柴油机良好的燃烧和排气,减少排气颗粒排放率
B. 在柴油机负荷低时,旁通全部废气,防止锅炉烟垢沉积
C. A十B
D. 在柴油机负荷高时,废气部分旁通,减少锅炉烟垢沉积
[单选题]The crank-room cover should not be opened until at least () minutes after the engine stops.
A. 10
B. 15
C. 20
D. 30
[单选题]The engine has one or two group of fuel pumps, depending upon ().
A. the number of fuel valves
B. the number of cylinders
C. the speed of engine
D. the power of engine
[单选题]If the temperature drops low enough, oil will not flow, () just tell us the temperature.
A. Hash point
B. Viscosity
C. Pour point
D. Cetane number
[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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