A.The boiler oil tank
B.The steam pipe
C.The fire side
D.The safety valves
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A.oxygen in the water
B.poor boiler design
C.density too high
D.excessive steam demand
A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
A.condensate
B.a small amount of make-up feed
C.A and B
D.None of the above
A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio
最新試題
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
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Which of the following statements is correct concerning heat transfer?（）
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Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Low compressor head pressure in a refrigeration system can be caused by（）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）