BLACK SEAL EXAM 300 QUESTIONS & CORRECT
ANSWERS LATEST 2025
A Manometer measures? - ANSWER-difference in pressure between two points
Spalling in a boiler refers to - ANSWER-Hairline cracks in the refractory
Fittings on a boiler are necessary for proper boiler operation because of? -
ANSWER-Efficiency and safety
To prevent a vacuum on a boiler coming off the line the operator should ? -
ANSWER-Open the boiler vent
Safety valves are designed to? - ANSWER-pop open
Scale protects the boiler heating surfaces? - ANSWER-False
All steam boilers must have one or more safety valves? - ANSWER-True
A low pressure steam boilers MAWP is _______ psi - ANSWER-15
The bourbon tube in a steam pressure gauge is protected by what? - ANSWER-A
siphon
,A compound gauge indicates - ANSWER-Pressure or vacuum
The boiler operator must ________ before laying up a boiler - ANSWER-
Thoroughly clean both the fire and water side of the boiler
T/F
Pressure on water does not change the boiling point of water - ANSWER-False
In a fire tube boiler the heat and gases of combustion pass - ANSWER-through the
tubes
A siphon installed between the boiler and the pressure gauge protects the
Bourdon tube from_____ reaching the pressure gauge - ANSWER-Steam
On boilers that have a quick opening and screw blow down valves, the quick
opening valve must be located ? - ANSWER-Closest to the boiler and followed by
the screw type valve
T/F
Softened water is used in a boiler to prevent pitting - ANSWER-False
The pour points of fuel oil is the ________ temp at which fuel will ? - ANSWER-
Lowest/flow
,The fire point of fuel oil is the minimum temperature at which the fuel oil will -
ANSWER-burn continually
Surface tension on water in the steam and water drums are increased by? -
ANSWER-Impurities floating on the water surface
The bottom blow down on a boiler - ANSWER-Removes sludge and sediment from
the mud drum
T/F
Anthracite coal has a Hugh carbon content - ANSWER-True
Try cocks on a water column are used ? - ANSWER-As a secondary means of
determining the water level
T/F
When boilers are set in battery, The bottom blow down valves, feed water valves
and the Main steam stop valves should be locked closed before entering the
boiler - ANSWER-True
The best time to blow down a boiler is ? - ANSWER-At its lowest load
T/F
A boiler should always start in High fire to ensure proper ignition of the fuel -
ANSWER-False
, How many different basic types of boilers are there? - ANSWER-3
What is placed inside the steam and water drums of a laid up boiler to absorb
moisture? - ANSWER-Silica gel
The most important fitting on a boiler is the? - ANSWER-safety valve
Low pressure boilers equipped with quick opening and screw valves are blown
down by opening the valves in what order? - ANSWER-Quick opening first
Water hammer in steam lines is caused by ..... - ANSWER-condensation in the line
as fuel oil is heated, its viscosity - ANSWER-decreases
Draft availability in a natural draft system is dependent on - ANSWER-Height of
the chimney
Safety valve connections must be approved by the ___ - ANSWER-American
Society of Mechanical Engineers (ASME)
Draft is measured with a(n) - ANSWER-Manometer
Under what ASME code is the care and operation of heating boilers - ANSWER-
Section VI
Foaming could be caused by? - ANSWER-Impurities on the water surface
ANSWERS LATEST 2025
A Manometer measures? - ANSWER-difference in pressure between two points
Spalling in a boiler refers to - ANSWER-Hairline cracks in the refractory
Fittings on a boiler are necessary for proper boiler operation because of? -
ANSWER-Efficiency and safety
To prevent a vacuum on a boiler coming off the line the operator should ? -
ANSWER-Open the boiler vent
Safety valves are designed to? - ANSWER-pop open
Scale protects the boiler heating surfaces? - ANSWER-False
All steam boilers must have one or more safety valves? - ANSWER-True
A low pressure steam boilers MAWP is _______ psi - ANSWER-15
The bourbon tube in a steam pressure gauge is protected by what? - ANSWER-A
siphon
,A compound gauge indicates - ANSWER-Pressure or vacuum
The boiler operator must ________ before laying up a boiler - ANSWER-
Thoroughly clean both the fire and water side of the boiler
T/F
Pressure on water does not change the boiling point of water - ANSWER-False
In a fire tube boiler the heat and gases of combustion pass - ANSWER-through the
tubes
A siphon installed between the boiler and the pressure gauge protects the
Bourdon tube from_____ reaching the pressure gauge - ANSWER-Steam
On boilers that have a quick opening and screw blow down valves, the quick
opening valve must be located ? - ANSWER-Closest to the boiler and followed by
the screw type valve
T/F
Softened water is used in a boiler to prevent pitting - ANSWER-False
The pour points of fuel oil is the ________ temp at which fuel will ? - ANSWER-
Lowest/flow
,The fire point of fuel oil is the minimum temperature at which the fuel oil will -
ANSWER-burn continually
Surface tension on water in the steam and water drums are increased by? -
ANSWER-Impurities floating on the water surface
The bottom blow down on a boiler - ANSWER-Removes sludge and sediment from
the mud drum
T/F
Anthracite coal has a Hugh carbon content - ANSWER-True
Try cocks on a water column are used ? - ANSWER-As a secondary means of
determining the water level
T/F
When boilers are set in battery, The bottom blow down valves, feed water valves
and the Main steam stop valves should be locked closed before entering the
boiler - ANSWER-True
The best time to blow down a boiler is ? - ANSWER-At its lowest load
T/F
A boiler should always start in High fire to ensure proper ignition of the fuel -
ANSWER-False
, How many different basic types of boilers are there? - ANSWER-3
What is placed inside the steam and water drums of a laid up boiler to absorb
moisture? - ANSWER-Silica gel
The most important fitting on a boiler is the? - ANSWER-safety valve
Low pressure boilers equipped with quick opening and screw valves are blown
down by opening the valves in what order? - ANSWER-Quick opening first
Water hammer in steam lines is caused by ..... - ANSWER-condensation in the line
as fuel oil is heated, its viscosity - ANSWER-decreases
Draft availability in a natural draft system is dependent on - ANSWER-Height of
the chimney
Safety valve connections must be approved by the ___ - ANSWER-American
Society of Mechanical Engineers (ASME)
Draft is measured with a(n) - ANSWER-Manometer
Under what ASME code is the care and operation of heating boilers - ANSWER-
Section VI
Foaming could be caused by? - ANSWER-Impurities on the water surface
