operating the boiler at less than normal water level
installing fins on the firesides of water-tubes
increasing the amount of excess air to the burners
treating the boiler water with chemical oxygen scavengers
第1题：
Receives saturated steam from the generating tubes
Serves as a reservoir of boiler feed water
Holds internal fittings for separation of moisture from steam
Collects steam exhausted from the turbines
第2题：
relight the boiler immediately to prevent loss of steam pressure
relight the fire off the brickwork as the bricks are cherry red
purge the furnace of any combustible gases before attempting to relight the fire
speed up the feed pump to prevent dry firing when the burner flame is reestablished
第3题：
A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.
A.corrosion at low engine loads
B.erosion at high engine loads
C.overload at high engine loads
D.scaling at all exhaust temperatures
第4题：
size of the heat sink
temperature difference between the regions
size of the heat source
total heat of the system
第5题：
remove suspended and precipitated solids from the boiler water
completely drain the boiler in an emergency situation
prevent hardened scale deposits in the water drum
remove floating impurities from the oily water surface
第6题：
The safety valve escape piping should be disconnected from the valve body and a blank inserted
The boiler vent valves should be opened
All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks
All of the above
第7题：
The safety valve escape piping should be disconnected from the valve body and a blank inserted
The boiler vent valves should be opened
All handhole/manhole covers should be tightened up as much as possible to preclude any leaks
All of the above
第8题：
lower thermal expansion rates than wet liners
greater heat transfer rate than wet liners
greater wear resistance than wet liners
procedure to replace dry liners is simpler than for wet liners
第9题：
Heat is always transferred at a constant rate
Heat transfer rate increases as temperature difference increases
The rate of heat transfer is not affected by temperature difference
The high temperature region is known as a heat sink
第10题：
Heat is given off from a high temperature region known as a heat sink
Heat transfer rate is affected most by the size of the heat sink involved
Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink
Heat transfer by radiation will occur only by mass motion of a fluid substance