BLACK SEAL HIGH PRESSURE EXAM PRACTICE 2026|2027 QUESTIONS
WITH 100% VERIFIED ANSWERS
What water treatment chemical is used to control alkalinity in boiler feedwater? - Correct Answer -
caustic soda
In a cooling water system when comparing a 3-inch gate valve to a 3-inch globe valve used for the same
application in the process, what will happen if both valves were fully open? - Correct Answer -The globe
valve would produce the larger head loss and the smaller flow rate.
What chemical should be added to boiler feedwater to prevent oxidation of the boiler drum and tubes? -
Correct Answer -sodium sulfite
Where is caustic embrittlement most likely to occur? - Correct Answer -on a riveted joint below the
water line
What is the proper procedure for returning a gauge glass to service, after installing a new glass? -
Correct Answer -open the drain and crack open the top valve
1|Page
,On a steam boiler in order to prevent the generation of steam greater than the maximum working
pressure requires activation of what device? - Correct Answer -The high steam pressure limit control
What is a generally accepted method to verify at the local level that a manual valve is fully closed on a
static piping system that is in the depressurized condition? - Correct Answer -Attempting to turn the
handwheel in the closed direction and verify no movement.
When a low-water fuel cutoff (LWFCO) has activated on a hot water heating boiler what shall happen? -
Correct Answer -Operation of the LWFCO shall cause a safety shutdown and lockout, requiring a physical
manual reset
When comparing a globe valve and a gate valve in the same application, the gate valve has a
__________pressure drop when fully opened and is the _________choice for throttling. - Correct Answer -
lower: poorer
If one atmosphere is about 14.7 psia what is the standard barometer reading at sea level equal to? -
Correct Answer -760 mm. Hg
After an adjustment of the packing gland on a valve that had a minor packing leak, the operator attempts
to operate the valve but finds it stuck. What is the most probable cause? - Correct Answer -The operator
overtightened the packing, causing the stem to bind.
2|Page
, What is the purpose of a siphon on a steam pressure gauge? - Correct Answer -to protect the gauge
from high steam pressure
A boiler horsepower is defined as: - Correct Answer -Evaporation of 34.5 pounds of water
In a water tube boiler, the gases of combustion will pass: - Correct Answer -Around the tubes
Where would you find a cyclone separator? - Correct Answer -In the steam drum
What is the regulation corresponding to boiler, pressure vessels and refrigeration systems in New
Jersey? - Correct Answer -New Jersey Administrative Code (NJAC) 12:90
When a license is improperly or not posted what is the amount of penalty or fine that may be imposed on
the Engineer, by the state? - Correct Answer -$500.00
In a high pressure steam plant, in which type of condenser would the cooling water and steam come into
direct contact? - Correct Answer -An open type
3|Page
WITH 100% VERIFIED ANSWERS
What water treatment chemical is used to control alkalinity in boiler feedwater? - Correct Answer -
caustic soda
In a cooling water system when comparing a 3-inch gate valve to a 3-inch globe valve used for the same
application in the process, what will happen if both valves were fully open? - Correct Answer -The globe
valve would produce the larger head loss and the smaller flow rate.
What chemical should be added to boiler feedwater to prevent oxidation of the boiler drum and tubes? -
Correct Answer -sodium sulfite
Where is caustic embrittlement most likely to occur? - Correct Answer -on a riveted joint below the
water line
What is the proper procedure for returning a gauge glass to service, after installing a new glass? -
Correct Answer -open the drain and crack open the top valve
1|Page
,On a steam boiler in order to prevent the generation of steam greater than the maximum working
pressure requires activation of what device? - Correct Answer -The high steam pressure limit control
What is a generally accepted method to verify at the local level that a manual valve is fully closed on a
static piping system that is in the depressurized condition? - Correct Answer -Attempting to turn the
handwheel in the closed direction and verify no movement.
When a low-water fuel cutoff (LWFCO) has activated on a hot water heating boiler what shall happen? -
Correct Answer -Operation of the LWFCO shall cause a safety shutdown and lockout, requiring a physical
manual reset
When comparing a globe valve and a gate valve in the same application, the gate valve has a
__________pressure drop when fully opened and is the _________choice for throttling. - Correct Answer -
lower: poorer
If one atmosphere is about 14.7 psia what is the standard barometer reading at sea level equal to? -
Correct Answer -760 mm. Hg
After an adjustment of the packing gland on a valve that had a minor packing leak, the operator attempts
to operate the valve but finds it stuck. What is the most probable cause? - Correct Answer -The operator
overtightened the packing, causing the stem to bind.
2|Page
, What is the purpose of a siphon on a steam pressure gauge? - Correct Answer -to protect the gauge
from high steam pressure
A boiler horsepower is defined as: - Correct Answer -Evaporation of 34.5 pounds of water
In a water tube boiler, the gases of combustion will pass: - Correct Answer -Around the tubes
Where would you find a cyclone separator? - Correct Answer -In the steam drum
What is the regulation corresponding to boiler, pressure vessels and refrigeration systems in New
Jersey? - Correct Answer -New Jersey Administrative Code (NJAC) 12:90
When a license is improperly or not posted what is the amount of penalty or fine that may be imposed on
the Engineer, by the state? - Correct Answer -$500.00
In a high pressure steam plant, in which type of condenser would the cooling water and steam come into
direct contact? - Correct Answer -An open type
3|Page
