【名词&注释】
润滑油(lubricating oil)、液压油(hydraulic oil)、极限值、活塞环(piston ring)、说明书(specification)
[单选题]在约定MCR工况下,废气锅炉推荐的最大压力损失一般为()MPa。
A. 0.001
B. 0.0015
C. 0.003
D. 0.0035
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学习资料:
[单选题]液压拉伸器的液压系统中的液压油绝对不可使用()。Ⅰ.液压油;Ⅱ.系统润滑油;Ⅲ.高级润滑油;Ⅳ.气缸油;Ⅴ.透平油。
A. Ⅳ+Ⅴ
B. Ⅱ+Ⅲ
C. Ⅱ+Ⅳ
D. Ⅰ+Ⅳ
[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,活塞裙部减磨环与气缸内孔单边最小间隙应不小于()。
A. 该处总间隙的30%
B. 说明书(specification)规定极限值的30%
C. 该处总间隙的20%
D. 说明书(specification)规定极限值的20%
[单选题]Leaky exhaust valve will result in which of the following?()(1) high exhaust temperature;(2) low compression pressure;(3) low firing pressure.
A. (1) and (2)
B. (1) only
C. (2) only
D. (1),(2) and (3)
[单选题]Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent ().
A. excessive crankcase pressure
B. excessive lube oil temperature
C. contamination of the lube oil by water
D. contamination of the cooling water by lube oil
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