【名词&注释】
柴油机(diesel engine)、增压器(turbocharger)、舵系中心线、光学仪器法、中心线位置
[单选题]舵系中心线与轴系中心线位置度检验方法采用()。
A. 专用量具
B. 光学仪器法
C. 专用量具或光学仪器法
D. 拉线法
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学习资料:
[单选题]MAN B&W MC型柴油机在约定MCR工况下,允许增压器后排气背压为()MPa,废气管内实际流速约为()m/s
A. 0.0015/20
B. 0.0015/30
C. 0.003/35
D. 0.0035/50
[单选题]对于质量分布在同一平面内,轴向长度较小的回转件,其平衡精度用()表示。
A. A.FR
B. B.e
C. C.e×ω
D. D.G
[单选题]油润滑艉轴承和艉轴在()式润滑系统中工作,艉轴()。
A. 闭/包铜套
B. 闭/不包铜套
C. 开/包铜套
D. 开/不包铜套
[单选题]During the suction stroke, the piston is moving ().
A. inwards
B. outwards
C. downwards
D. upward
[单选题]Exhaust temperature increases in all cylinders, the possible cause may be()(1) increased scavenging air temperature(2) air in fuel pumps and fuel valves(3) fouling of air and gas passages
A. (1)+(2)
B. (1)+(3)
C. (2)+(3)
D. (1)+(2)+(3)
[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]To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of ().
A. brass
B. copper
C. iron
D. monel metal or stainless steel
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