steam demand is high
salinity is high
safety valve simmers
burner flame is extinguished
第1题：
When an auxiliary boiler is panting and emitting(发出) black smoke, you should______.
A.increase the fuel oil temperature
B.decrease the fuel oil temperature
C.decrease the fuel oil supply pressure
D.increase the air supply
第2题：
concentrations of calcium sulfate in the boiler water
fuel oil in the feed water
improper treatment of the feed water with calcium sulfate
excessive feed water alkalinity
第3题：
A.salinity is abnormally
B.high steam demand is too
C.feed-water flow is low
D.water level is abnormally low
第4题：
fuel oil supply temperature is normal
burner electrode is incorrectly positioned
fuel／air ratio is incorrect
ignition current is too low
第5题：
Move the fuel control mechanism to the no fuel position
Block the fuel supply by closing the master fuel valve
Shut off the fuel supply and block the flow of intake air
Relieve all pressure in the fuel system
第6题：
cold fuel oil
low fuel oil pressure
low atomizing steam pressure
water in the fuel oil
第7题：
relieve excess fuel oil pressure during the “off” fire cycle
admit water to the dry pipe
throttle the forced draft fan output for proper combustion
reduce excess steam pressure in the boiler
第8题：
The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler ______.
A.steam demand is high
B.salinity is high
C.safety valve simmers(爆发)
D.burner flame is extinguished
第9题：
an increased flash point
higher lube oil pressures
an increased viscosity
lower lube oil pressures
第10题：
increase the fuel oil temperature
decrease the fuel oil temperature
decrease the fuel oil supply pressure
increase the air supply