Cooling of engine is achieved by circulation a cooling liqui

【名词&注释】

磨损量(wear loss)

[单选题]Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

A. boiler
B. heater
C. engine
D. cooler

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学习资料：

[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

[单选题]测量曲轴臂距差时，曲轴旋转一周，可依次测得臂距值为（）。

A. L右、L上、L下、L左
B. L上、L下、L左、L右
C. L左、L右、L上、L下
D. L上、L右、L下、L左

[单选题]常见气阀的损伤有（）等。Ⅰ.气阀阀盘锥面；Ⅱ.阀面的烧伤与高温腐蚀；Ⅲ.阀盘与阀杆的裂纹；Ⅳ.阀杆的弯曲变形；Ⅴ.阀杆的磨损。

A. Ⅰ+Ⅱ+Ⅲ
B. Ⅰ+Ⅲ+Ⅳ+Ⅴ
C. Ⅰ+Ⅱ+Ⅲ+Ⅴ
D. Ⅰ+Ⅱ+Ⅲ+Ⅳ+Ⅴ

[单选题]In a naturally aspirated diesel engine, the volume of air intake is directly related to engine （）.

A. compression ratio
B. valve size
C. fuel pressure
D. cylinder clearance volume

[单选题]In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.

A. suction pressure regulator
B. thermostatic bypass valve
C. sea water temperature
D. water level in the expansion tank

[单选题]For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.

A. oil spray
B. oil bath
C. oil control rings
D. drilled passage through the camshaft

[单选题]Waterside scale in a fire-tube boiler may cause （）.

A. increased heat transfer
B. fireside erosion
C. high steam demand
D. overheated tube

[单选题]Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.

A. wheelhouse control station
B. engine room control station
C. captains office
D. chief engineers office

[单选题]If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.

A. compression pressures are below normal
B. lube oil is diluted with fuel oil
C. cranking speed is too low
D. exhaust system is partially restricted

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