單項選擇題

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

你可能感興趣的試題

單項選擇題

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

單項選擇題

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