船舶动力装置题库2022相关专业每日一练(07月29日)

1. [单选题]将主轴颈下沉量视为主轴承下瓦的磨损量是由于（）。

A. 主轴颈无磨损
B. 忽略曲轴主轴颈的磨损量
C. 二者磨损相同
D. 主轴承下瓦磨损量大

2. [单选题]Blow-off of the relief valves of the main cylinders during operation indicates （）.

A. the cylinder cover is cracked
B. the injector holes is clogged
C. the cams are not properly set
D. fuel pump is leaking

3. [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

4. [单选题]Vee-type engines have the connecting rods from two cylinders connected to each （） of the crankshaft.

A. throw
B. web
C. main bearing
D. deflectio

5. [单选题]The highest pressure in a diesel engine cylinder normally occurs （）.

A. at TDC
B. before TDC
C. after TDC
D. during air starting

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