2022船舶动力装置题库考试试题下载(3L)

1. [单选题]当十字头式柴油机缸径＞700mm时，在未装活塞环的条件下，活塞位于近上、下止点位置时，活塞裙部减磨环处与气缸内孔单边最小间隙应不小于（）。

A. 该处总间隙的30%
B. 该处总间隙的20%
C. 说明书^{(specification)}规定极限值的30%
D. 说明书^{(specification)}规定极限值的20%

2. [单选题]The cylinder and piston must be warmed up （） to a temperature of about 140 degF in standing by engine.

A. repeatedly
B. quickly
C. gradually
D. immediately

3. [单选题]The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.

A. assist in a quick cutoff of fuel injection
B. allow oil backflow from the injector to the helix
C. reduce fuel oil pressure between injection strokes
D. meter the quantity of fuel delivered

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