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单项选择题
A.proper combustion
B.water in the fuel
C.excess air
D.cold fuel oil
单项选择题
A.The safety valve escape piping should be disconnected from the valve body and a blank inserted
B.The boiler vent valves should be opened
C.All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks
D.All of the above
单项选择题
A.The boiler oil tank
B.The steam pipe
C.The fire side
D.The safety valves
单项选择题
A.oxygen in the water
B.poor boiler design
C.density too high
D.excessive steam demand
单项选择题
A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
单项选择题
A.condensate
B.a small amount of make-up feed
C.A and B
D.None of the above
单项选择题
A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
单项选择题
A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio
单项选择题
A.Reciprocating pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
单项选择题
A.discharge is continuous
B.it has no internal valves
C.upon accidental closing of discharge valve, excessive pressure will not build up
D.all of the above are true