BLACK SEAL EXAM SCRIPT PREMIUM
QUESTIONS AND SOLUTIONS GRADED A+
●● Carryover can lead to:
Answer: Water Hammer
●● Water column & gauge glass should be blown down:
Answer: Daily
●● If water leaves the boiler at 170•, what temperature does it return at?
Answer: 150•
●● What is the most common cause of cast iron boiler failure?
Answer: Cracking
●● The positioning control cannot function without:
Answer: Air
●● What is the most common of problems in a hot water system?
Answer: Air
●● What fire tube is most efficient?
,Answer: 4 Pass
●● Where are the combustion gases on a serpentine boiler?
Answer: Below the tubes
●● What is the purpose of a check valve?
Answer: To Prevent reverse flow & Allow flow in one direction
●● A solenoid valve:
Answer: Is an automatic gas shutoff valve
●● The most common type of pressure control device used is the:
Answer: Mercury Tube
●● A steam gauge is calibrated in:
Answer: Lbs/Sq. Inch
●● Heavy soot on the fireside of tubes:
Answer: Should be removed for better heat transfer
●● What code is a heating boiler built to:
Answer: ASME Section IV(4)
,●● When connecting a Bourdon tube steam gauge to a boiler, a pigtail is
used to:
Answer: Protect Bourdon tube from steam
●● External feed water treatment can be a _____ process.
Answer: Cold lime soda, hot lime soda, or ion exchange
●● Natural water may contain:
Answer: Solids and other pollutions
●● What is the min. temp of a hot water boiler operation to prevent
condensation?
Answer: 170 F
●● What test is performed on re-tubed (repaired) boiler and what is the
water temp.?
Answer: Hydrostatic test at 70F
●● T/F: The amount of draft is not affected by the height of the stack.
Answer: False
, ●● Under what ASME section is the care and operation of heating
boilers?
Answer: Section VI (6)
●● A aquastat is sensitive to changes in:
Answer: Water temperature
●● The expansion tank in a hot water system allows for the expansion
of:
Answer: Water
●● Who can adjust a safety valve?
Answer: Manufacturer Representative
●● As the water in a hot water system expands:
Answer: The pressure remains constant
●● A modulating pressuretrol controls:
Answer: The boiler's high and low fire
●● The pressuretrol:
Answer: Turns the boiler on and off
QUESTIONS AND SOLUTIONS GRADED A+
●● Carryover can lead to:
Answer: Water Hammer
●● Water column & gauge glass should be blown down:
Answer: Daily
●● If water leaves the boiler at 170•, what temperature does it return at?
Answer: 150•
●● What is the most common cause of cast iron boiler failure?
Answer: Cracking
●● The positioning control cannot function without:
Answer: Air
●● What is the most common of problems in a hot water system?
Answer: Air
●● What fire tube is most efficient?
,Answer: 4 Pass
●● Where are the combustion gases on a serpentine boiler?
Answer: Below the tubes
●● What is the purpose of a check valve?
Answer: To Prevent reverse flow & Allow flow in one direction
●● A solenoid valve:
Answer: Is an automatic gas shutoff valve
●● The most common type of pressure control device used is the:
Answer: Mercury Tube
●● A steam gauge is calibrated in:
Answer: Lbs/Sq. Inch
●● Heavy soot on the fireside of tubes:
Answer: Should be removed for better heat transfer
●● What code is a heating boiler built to:
Answer: ASME Section IV(4)
,●● When connecting a Bourdon tube steam gauge to a boiler, a pigtail is
used to:
Answer: Protect Bourdon tube from steam
●● External feed water treatment can be a _____ process.
Answer: Cold lime soda, hot lime soda, or ion exchange
●● Natural water may contain:
Answer: Solids and other pollutions
●● What is the min. temp of a hot water boiler operation to prevent
condensation?
Answer: 170 F
●● What test is performed on re-tubed (repaired) boiler and what is the
water temp.?
Answer: Hydrostatic test at 70F
●● T/F: The amount of draft is not affected by the height of the stack.
Answer: False
, ●● Under what ASME section is the care and operation of heating
boilers?
Answer: Section VI (6)
●● A aquastat is sensitive to changes in:
Answer: Water temperature
●● The expansion tank in a hot water system allows for the expansion
of:
Answer: Water
●● Who can adjust a safety valve?
Answer: Manufacturer Representative
●● As the water in a hot water system expands:
Answer: The pressure remains constant
●● A modulating pressuretrol controls:
Answer: The boiler's high and low fire
●● The pressuretrol:
Answer: Turns the boiler on and off
