In a （） engine the charge of air in the cylinder before co

【名词&注释】

增压器(turbocharger)、涡轮机(turbine)、螺旋桨鸣音

[单选题]In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.

A. pressure charged
B. naturally aspirated
C. contaminated
D. high speed diesel

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学习资料：

[单选题]要求机座全部底脚螺栓中的（）以上的螺栓采用紧配螺栓，以防机座移位。

A. A．10%
B. B．15%
C. C．20%
D. D．25%

[单选题]喘振是（）流通部分出现气流与叶片强烈撞击和脱流的结果。

A. 压气机
B. 涡轮机
C. 增压器
D. 涡轮壳体

[单选题]消除螺旋桨鸣音的办法是将随边（）制成抗鸣边缘，从而改变涡流引起的振动频率。

A. 0.4R～0.8R处
B. 0.4R处以外
C. 0.4R～0.7R处
D. 0.4R处

[单选题]An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.

A. viscosity
B. twisting moments
C. inertia
D. thermal expansio

[单选题]The design of （） is similar to that of the main bearing.

A. the block bearing
B. the camshaft bearing
C. the connecting rod small end bearing
D. the connecting rod large end bearing

[单选题]The process to remove exhaust gases by blowing in fresh air is called （）.

A. charging
B. supercharging
C. starting
D. scavenging

[单选题]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time

[单选题]A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.

A. double-acting engine
B. opposed pistons engine
C. single-acting engine
D. horizontal acting engine

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