【名词&注释】
工作时间(working time)、蒸汽压力(steam pressure)、锅炉蒸发量
[单选题]废气锅炉的蒸汽压力和蒸发量的选择应是()。
A. 蒸汽压力有所降低时可获得更多余热和废气锅炉蒸发量
B. 蒸汽压力有所提高时可获得更多余热和废气锅炉蒸发量
C. 蒸汽压力降低时则废气锅炉蒸发量减小
D. A,B,C均可
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学习资料:
[单选题]某设备的λ=0.0001,工作时间为50O0h,则R(5000)为()。
A. 0.99
B. 0.0948
C. 0.6065
D. 0.3679
[单选题]Which of the following may lead to the engine NOT to start on air?()
A. starting air pressure too high
B. correct timing of starting air valves
C. three of the six starting valves stuck
D. the turning gear disengaged
[单选题]If the temperature drops low enough, oil will not flow, () just tell us the temperature.
A. Hash point
B. Viscosity
C. Pour point
D. Cetane number
[单选题]Camshafts are usually driven by timing gears or ().
A. push rods
B. chain drives
C. rocker arms
D. flywheel
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