BLACK SEAL CERTIFICATION EVALUATION
TESTED QUESTIONS AND ANSWERS
COMPLETE REVIEW
●● If a one square inch column of water is one foot tall, how much does
it weigh?
Answer: .433 lbs
●● Where is the flame sensing device located on a boiler?
Answer: front
●● Cracking of the boiler metal can be caused by:
Answer: caustic embrittlement
●● How would you test the operation of the flame failure device?
Answer: by shutting off the fuel supply valve
●● Where are the combustible gases located in a water tube boiler?
Answer: flowing around the tubes
●● What are you preventing by increasing the pressure within a cold
boiler gradually?
,Answer: thermal shock
●● When performing a hydrostatic test, the pressure on the boiler should
not exceed:
Answer: 10 psi above 1.5 times the MAWP
●● A boiler operator log must be maintained in a boiler room containing
over:
Answer: 100 horsepower
●● If a flame sensing device notices that there is a flame failure, what
device does it secure?
Answer: fuel solenoid valve
●● What type of draft has a fan between the boiler and the chimney?
Answer: induced
●● What is used to control alkalinity?
Answer: caustic soda
●● What is the best way to decide the blowdown frequency for a boiler?
Answer: boiler water analysis
, ●● What device is used to obtain sufficient static head for the returning
condensate in a two-pipe gravity return system?
Answer: return trap
●● What is the maximum temperature a hot water boiler can be to
qualify in New Jersey as low pressure?
Answer: 250 degrees
●● What type of boiler is an HRT (horizontal return tube)?
Answer: fire-tube
●● What is the purge cycle in a boiler meant to do?
Answer: remove combustible gases
●● Which valve is allowed between the boiler and safety valve?
Answer: no valve
●● Which is a common type of feedwater regulator in a low pressure
plant?
Answer: pressure sensitive device
●● When open, an OS&Y (outside stem & yoke) valve offers ----- to the
flow of steam.
TESTED QUESTIONS AND ANSWERS
COMPLETE REVIEW
●● If a one square inch column of water is one foot tall, how much does
it weigh?
Answer: .433 lbs
●● Where is the flame sensing device located on a boiler?
Answer: front
●● Cracking of the boiler metal can be caused by:
Answer: caustic embrittlement
●● How would you test the operation of the flame failure device?
Answer: by shutting off the fuel supply valve
●● Where are the combustible gases located in a water tube boiler?
Answer: flowing around the tubes
●● What are you preventing by increasing the pressure within a cold
boiler gradually?
,Answer: thermal shock
●● When performing a hydrostatic test, the pressure on the boiler should
not exceed:
Answer: 10 psi above 1.5 times the MAWP
●● A boiler operator log must be maintained in a boiler room containing
over:
Answer: 100 horsepower
●● If a flame sensing device notices that there is a flame failure, what
device does it secure?
Answer: fuel solenoid valve
●● What type of draft has a fan between the boiler and the chimney?
Answer: induced
●● What is used to control alkalinity?
Answer: caustic soda
●● What is the best way to decide the blowdown frequency for a boiler?
Answer: boiler water analysis
, ●● What device is used to obtain sufficient static head for the returning
condensate in a two-pipe gravity return system?
Answer: return trap
●● What is the maximum temperature a hot water boiler can be to
qualify in New Jersey as low pressure?
Answer: 250 degrees
●● What type of boiler is an HRT (horizontal return tube)?
Answer: fire-tube
●● What is the purge cycle in a boiler meant to do?
Answer: remove combustible gases
●● Which valve is allowed between the boiler and safety valve?
Answer: no valve
●● Which is a common type of feedwater regulator in a low pressure
plant?
Answer: pressure sensitive device
●● When open, an OS&Y (outside stem & yoke) valve offers ----- to the
flow of steam.
