【名词&注释】
动力装置(power plant)、三角形(triangle)、气缸套(cylinder liner)、符合要求(meet the requirement)
[单选题]当轴系同轴度测量值总偏移和总曲折落入标准值δ总max-φ总max三角形内时,表明轴系的()符合要求(meet the requirement)。
A. 扭曲度
B. 弯曲度
C. 偏差度
D. 同轴度
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学习资料:
[单选题]动力装置长期在部分负荷下工作,废热锅炉排烟温度t2过低,对废热利用设备的维护管理是()。
A. 有利的
B. 合理的
C. 必须的
D. 不利的
[单选题]当气缸套工作表面有轻微的拉痕或磨痕时,应使用()进行打磨予以消除。
A. 锉刀
B. 刮刀
C. 油石
D. 扁铲
[单选题]Increased air () will raise scavenge efficiency and allow a greater mass of air to be compressed; more fuel may now be burned giving an increased power.
A. specific volume
B. density
C. viscosity
D. calorific value
[单选题]The exhaust gases for a new engine should be () when the engine operates under full load.
A. smoky
B. a little bit dense
C. visible
D. almost invisible
[单选题]The mechanical efficiency of an engine () because losses occur in the form of friction.
A. is always less than 100%
B. is always more than 100%
C. is always equal to 90%
D. is always less than 90%
[单选题]Which of the following may take place if the clearance of the main bearings are excessive?()
A. bearing knocks
B. dropping of pressure of LO
C. noises
D. all the above
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