Steam Boilers Tech Check 8 Flashcards
The primary function of a combustion control is to ensure———–
A safe boiler operation
B. boiler efficiency
C.safe and efficient boiler operation
D temperature regulation of the gases of combustion
C.safe and efficient boiler operation
The ON/OFF control system is usually found on————
A. boilers with large fluctuating loads
B. package fire tube boilers
C. boilers with high steam demand but constant load
D. low pressure boilers only
B. package fire tube boilers
The purpose of the boiler pressure control found in the ON/oFF control system is to————–
A regulate steam flow
B. regulate air flow
C. regulate fuel flow
D. start and stop the burner on steam pressure demand
D. start and stop the burner on steam pressure demand
The ON/OFF pressure control must be connected to the————
A.main steam line
B. main feedwater line
C. highest part of the steam side of the boiler
D. water side of the boiler below the NOWL
C. highest part of the steam side of the boiler
A steam siphon ensures that———– does not enter the boiler pressure control.
A steam
B. water
C. air
D.gas
A steam
A mercury-tube pressure control will only be accurate when it is installed
A. at the NOWL
B. below the NOWL
C. in a vertical position
D. in a horizontal position
C. in a vertical position
four elements that must be regulated in a combustion control system are———-,———–,———–,and——–.
A. fuel supply air supply; ratio of air to fuel; removal of
combustion gases
B. fuel supply water supply; air supply; ratio of water to fuel
C. temperature of water; temperature of fuel; temperature of steam; temperature of exit gases
D. pressure of water; pressure of steam; pressure of fuel;pressure of air
A. fuel supply air supply; ratio of air to fuel; removal of
combustion gases
The two scales found on the boiler pressure control are used to———-
A. set the operating steam pressure range of the boiler
B. eliminate low water
C. maintain high and low fire
D. warn the operator of flame failure
A. set the operating steam pressure range of the boiler
The purpose of the boiler modulating pressure control is to———
A. regulate the water flow
B. prevent carryover
C. start and stop the burner on steam pressure demand
D. regulate the high and low firing rates of the burner
D. regulate the high and low firing rates of the burner
The modulating pressure control must be connected to the————-
A. main steam line
B. main feedwater line
C. highest part of the steam side of the boiler
D water side of the boiler below the NowL
C. highest part of the steam side of the boiler
The burner motor continues to operate after fuel is shut off to the burner during————-
A. post purging
B. pre purging
C. synchronization
D. ignition lightoff
C. synchronization
The programmer in the ON/OFF control system is used to—————-
A. control the burner firing cycle
B. control the boiler operating range
C. secure the burner in the event of low water
D. regulate the steam flow
A. control the burner firing cycle
To eliminate the danger of a furnace explosion during startup, the firing sequence must first allow for————
A. pilot ignition
B. proving the pilot
C. a prepurge period
D. proving the main flame
C. a prepurge period
The purpose of the scanner is to prove
A, only the pilot
B. only the main flame
C. both the pilot and the main flame
D. the proper boiler water level
C. both the pilot and the main flame
The scanner must be installed on the front of the boiler to sight————
A. both the pilot and the main flame
B. the pilot only
C. the main flame only
D. the boiler water level
A. both the pilot and the main flame
