MAN-B&W公司推出的带汽轮发电机的废气锅炉系统，主要特点是

【名词&注释】

过热器(superheater)、蒸发器(evaporator)、给水预热器(feed unit water preheater)

[单选题]MAN-B&W公司推出的带汽轮发电机的废气锅炉系统，主要特点是它带有给水预热器、蒸发器和过热器的单压蒸汽系统；产生的蒸汽除用于加热外还可用于驱动汽轮发电机；废气锅炉与燃油辅助锅炉之间有循环水泵并共用汽鼓。对其评价可选为（）。

A. 该废气锅炉系统布置合理，但满足汽轮发电机所需蒸汽量时，不能满足加热之需
B. 排气余热利用较完善，能满足汽轮发电机和加热系统所需蒸汽量
C. 该废气锅炉系统更先进，不仅满足加热系统的要求，还部分满足汽轮发电机之需
D. 该废气锅炉系统适宜于各类功率大小的船舶

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学习资料：

[单选题]（）对发动机加速性影响更为突出，因此（）为优。

A. 运行部件的质量惯性/低速机
B. 运行部件的质量惯性/中速机
C. 受热部件的热惯性/低速机
D. 受热部件的热惯性/中速机

[单选题]曲轴与艉轴的同轴度误差的参数是（）。

A. δ总、φ总
B. δ、φ
C. δ总、φ
D. δ、φ总

[单选题]It is necessary to remove （） from the cooling spaces.

A. scar
B. scale
C. spur
D. bilge

[单选题]Opening of the cylinder （） will admit compressed air into the cylinder.

A. safety valve
B. indicator cock
C. blow-down valve
D. start valve

[单选题]The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.

A. an oil seal
B. removing heat
C. a gas seal
D. cooling the pisto

[单选题]Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.

A. clearance
B. crush
C. pitch
D. thrust

[单选题]In order to reverse the rotation of a two-stroke/cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed for the （）.

A. starting air and fuel pumps
B. piston cooling pumps
C. exhaust valves
D. all of the above

[单选题]Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.

A. temperature
B. pressure
C. engine speed
D. all of the above

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