1.Generating tubes in waste heat boilers are finned to ____________.
A.reduce gas flow turbulence
B.prevent exhaust gas corrosion
C.increase the rate of combustion
D.increase the rate of heat transfer
2.It is desirable for an auxiliary boiler safety valve to pop open and reseat quickly to __________.
A.give warning that excessive boiler pressure has been reached
B.prevent wire drawing of the disc and seat
C.prevent valve pounding
D.provide sufficient blowdown
3.A failure to any component of a flame safeguard control for an automatically fired auxiliary boiler, will result in ______________.
A.the prevention of automatic restart
B.an immediate furnace explosion
4.The amount of oil consumed by a return flow-type fuel atomization system, fitted with both supply and return meters, can be determined by the ____________.
A.supply meter reading only
B.return meter reading only
C.sum of the supply and return meter readings
D.difference between the supply and return meter readings
5.The flame safeguard control system of a large automatic auxiliary boiler will provide fuel shut off in the case of high ____________.
6.If the fire goes out in an automatically fired auxiliary boiler and the burner continues to supply fuel, there is a potential danger of ______________.
A.overpressure and dry firing
B.a severe furnace explosion
C.spalling damage to the brickwork
D.heat damage to the atomizer
7.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 gauge glass
D.crack the steam stop to assure protective steam flow
8.When an automatically fired boiler has a flameout, which of the following actions should occur FIRST?
A.The fuel valve should be de-energized.
B.The purge cycle should begin.
C.An alarm should ring.
D.The fuel oil pump should stop.