单项选择题
Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.
A.check and regulate the water level
B.close the air cock once fires are lit
C.blowdown the gage glass
D.crack the steam stop to assure protective steam flow
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相关考题
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单项选择题
Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（）
A.Maintains a constant head on the system
B.Reduces the likelihood of air or steam pockets formation
C.Provides a low pressure point for the addition of makeup cooling water
D.All of the above -
单项选择题
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 -
单项选择题
The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.
A.reduce water temperature
B.reduce water turbulence
C.provide an air cushion
D.allow for an increase in water volume as the engine warms up
