一般来说，轴系中心线的同轴度偏差是由于（）造成的。

【名词&注释】

中心线(center line)、充分利用(make full use)

[单选题]一般来说，轴系中心线的同轴度偏差是由于（）造成的。

A. 曲轴过度磨损
B. 主轴承过度磨损
C. 海损事故
D. 艉轴过度磨损

查看答案&解析 查看所有试题

学习资料：

[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

[单选题]All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.

A. angled
B. rounded
C. being angled
D. being rounded

[单选题]It is necessary to remove （） from the cooling spaces.

A. scar
B. scale
C. spur
D. bilge

[单选题]The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.

A. the oil separator
B. the fresh water generator
C. the compressor
D. fire pum

[单选题]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

A. be jammed
B. be opened
C. be seated
D. be broke

[单选题]When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.

A. just
B. nearly
C. merely
D. already

[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

[单选题]Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）.

A. inside micrometer
B. feeler gauge
C. adjustable trammel
D. sighting device

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