A.distance of the suction liquid level above the line of the pump
B.distance the suction liquid level is below the center line of the pump
C.force necessary to overcome frictional losses in the pump and piping
D.amount in inches of mercury the total suction head is below atmospheric pressure
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A.produces pressure
B.imparts energy to a fluid to move it from level ‘A’ to level ‘B’
C.creates a vacuum to move a liquid in all installation
D.is to develop a pressure differential
A.firing for extended periods in the low fire mode
B.overheating, due to waterside deposits
C.varying the water level above the crown sheet
D.carrying excessive alkalinity in the boiler water
A.decrease the velocity of gases flowing past the tubes
B.increase the rate of heat transfer
C.reduce accumulations carbon deposits
D.direct the flow of gases
A.fuel oil supply temperature is normal
B.burner electrode is incorrectly positioned
C.fuel／air ratio is incorrect
D.ignition current is too low
A.when the boiler has been secured long enough for most solids to settle
B.when the boiler has been cooled to ambient temperature
C.only after raising the water level to within 0~5 inch of the high water cutout only
D.after bypassing the low pressure
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