Some two thousand million years ago, the mountain on the sun was raised probably be

A feed pump for an auxiliary boiler might lose suction if the _____.

A.boiler water level is low

B.feedwater is too hot

C.boiler steam demand is low

D.feedwater is too cold

The water level in a steaming auxiliary boiler will always _____.

A.rise when the steam pressure is increased

B.remain constant as long as the feed pump operates

C.fall when the steam pressure is decreased

D.vary as the steam demand changes

In the event of a flame failure in an auxiliary water-tube boiler, you must______.

A.relight the boiler immediately to prevent loss of steam pressure

B.relight the fire off the brickwork as the bricks are cherry red

C.purge the furnace of any combustible gases before attempting to relight the fire

D.speed up the feed pump to prevent dry firing when the burner flame is reestablished

The most common cause of scale formation in an auxiliary boiler is _____.

A.concentrations of calcium sulfate in the boiler water

B.fuel oil in the feed water

C.improper treatment of the feed water with calcium sulfate

D.excessive feed water alkalinity

A.increased fuel consumption

B.increased feed water consumption

C.fuel pump failure

D.combustion control system failure

The boiler feed pump discharge pressure is higher than the steam drum pressure to _____.

A.ensure feed water flow into the boiler

B.keep the steam drum pressure high

C.prevent water hammer in the feed line

D.help the feed water flash to steam

A.Increased suction head pressure

B.Decreased feedwater temperature

C.Pump recirculating line being open too much

D.Excessive feedwater temperature

Improper maintenance of an automatic auxiliary boiler oil burner could result in _____.

A.fuel pump failure

B.fan motor failure

C.increased feedwater consumption

D.decreased boiler efficiency

Excessive vibration of an automatically fired auxiliary boiler can be caused by _____.

A.air or water in the furnace

B.combustion pulses

C.fuel oil pump failure

D.flame failure

A.feed pump suction line

B.hot well

C.shell of the feed heater

D.feed lines to the boiler