Black Seal Test 2025-2026 Most Recent Version
Comprehensive 400 Questions and Verified
Answers Accurate Solutions Already Graded A+
Get it 100% Correct
______ can lead to water hammer. - CORRECT ANSWER: Carryover
A aquastat is sensitive to changes in: - CORRECT ANSWER: Water temperature
A boiler operator's log must be maintained in all plants with over: - CORRECT
ANSWER: 100 horsepower
A boiler that is priming has ____. - CORRECT ANSWER: Water carried over with the
steam.
A boiler with water surrounding the outside of the tubes is called a _____ boiler. -
CORRECT ANSWER: Fire Tube
A common type of feedwater regulator is a: - CORRECT ANSWER: pressure sensitive
device
A draft fan located between the boiler and chimney is what type of draft? - CORRECT
ANSWER: Induced
A furnace explosion can be prevented by ____. - CORRECT ANSWER: Purging after
ignition failure
A low water fuel cutoff: - CORRECT ANSWER: Shuts off the fuel supply
,A manometer is calibrated in what units of measurement? - CORRECT ANSWER:
Inches of Water
A modulating pressure control is sensitive to: - CORRECT ANSWER: Pressure
A modulating pressuretrol controls: - CORRECT ANSWER: The boiler's high and low
fire
A rotary cup burner atomizes fuel: - CORRECT ANSWER: By means of a spinning
cup/high velocity air
A safety device that monitors the water level in the boiler and is electronically connected
to a fuel solenoid valve is called a: - CORRECT ANSWER: Low water cut-off
A safety valve on a low pressure hot water boiler will have a maximum setting of: -
CORRECT ANSWER: 160 psig
A solenoid valve: - CORRECT ANSWER: Is an automatic gas shutoff valve
A steam gauge is calibrated in: - CORRECT ANSWER: Lbs/Sq. Inch
A steam pressure gauge is designed to show steam calibrated in: - CORRECT
ANSWER: Lbs. / Sq. Inch
A steam pressure gauge is designed to show steam calibrated in: - CORRECT
ANSWER: Lbs./Sq. Inch
A vaporstat is sensitive to: - CORRECT ANSWER: Gas Pressure
,Absolute Pressure is equal to _____. - CORRECT ANSWER: Gauge Pressure +
Atmospheric Pressure
According to NJ Mechanical Inspection Bureau rules, the boiler jurisdiction (regulation)
number must be placed on the ___ of each boiler - CORRECT ANSWER: Front
An indication of a dirty fuel oil strainer would be: - CORRECT ANSWER: Slight change
in pressure drop
As solids and alkalinity in boiler water increase: - CORRECT ANSWER: Waterside
scaling is increased
As the water in a hot water system expands: - CORRECT ANSWER: The pressure
remains constant
Automatic feedwater regulators are blown down how often? - CORRECT ANSWER:
Daily
Blowing down a boiler excessively will cause a loss of: - CORRECT ANSWER:
Blowdown heat
Boiler fittings are important for: - CORRECT ANSWER: Safety only
Boiler water having high alkalinity could develop: - CORRECT ANSWER: Caustic
embrittlement
Boiler water having high alkalinity will develop: - CORRECT ANSWER: Caustic
embrittlement
, Boiler water should have a pH of: - CORRECT ANSWER: 11
Boilers are equipped with combustion gas/fuel oil burners for: - CORRECT ANSWER:
More flexible operation
Bottom blowdown is best performed when the boiler is___. - CORRECT ANSWER:
Under light load
Carryover can lead to: - CORRECT ANSWER: Water Hammer
Carryover could be dangerous and cause: - CORRECT ANSWER: Water Hammer
Cast iron sectional boilers are built for what type of draft firing? - CORRECT ANSWER:
Mechanical forced and/or induced
Cast iron sectional boilers are built for what type of draft firing? - CORRECT ANSWER:
Mechanical forced and/or induced
Combination forced and induced draft is also known as ____ draft. - CORRECT
ANSWER: Balanced
Combustion air is controlled by: - CORRECT ANSWER: Inlet dampers, fan intake vanes
and fan speed
Cracking of the boiler metal along the seams can be caused by: - CORRECT ANSWER:
Oxygen pitting
Draft in a boiler is measured in ___. - CORRECT ANSWER: Inches of water
Comprehensive 400 Questions and Verified
Answers Accurate Solutions Already Graded A+
Get it 100% Correct
______ can lead to water hammer. - CORRECT ANSWER: Carryover
A aquastat is sensitive to changes in: - CORRECT ANSWER: Water temperature
A boiler operator's log must be maintained in all plants with over: - CORRECT
ANSWER: 100 horsepower
A boiler that is priming has ____. - CORRECT ANSWER: Water carried over with the
steam.
A boiler with water surrounding the outside of the tubes is called a _____ boiler. -
CORRECT ANSWER: Fire Tube
A common type of feedwater regulator is a: - CORRECT ANSWER: pressure sensitive
device
A draft fan located between the boiler and chimney is what type of draft? - CORRECT
ANSWER: Induced
A furnace explosion can be prevented by ____. - CORRECT ANSWER: Purging after
ignition failure
A low water fuel cutoff: - CORRECT ANSWER: Shuts off the fuel supply
,A manometer is calibrated in what units of measurement? - CORRECT ANSWER:
Inches of Water
A modulating pressure control is sensitive to: - CORRECT ANSWER: Pressure
A modulating pressuretrol controls: - CORRECT ANSWER: The boiler's high and low
fire
A rotary cup burner atomizes fuel: - CORRECT ANSWER: By means of a spinning
cup/high velocity air
A safety device that monitors the water level in the boiler and is electronically connected
to a fuel solenoid valve is called a: - CORRECT ANSWER: Low water cut-off
A safety valve on a low pressure hot water boiler will have a maximum setting of: -
CORRECT ANSWER: 160 psig
A solenoid valve: - CORRECT ANSWER: Is an automatic gas shutoff valve
A steam gauge is calibrated in: - CORRECT ANSWER: Lbs/Sq. Inch
A steam pressure gauge is designed to show steam calibrated in: - CORRECT
ANSWER: Lbs. / Sq. Inch
A steam pressure gauge is designed to show steam calibrated in: - CORRECT
ANSWER: Lbs./Sq. Inch
A vaporstat is sensitive to: - CORRECT ANSWER: Gas Pressure
,Absolute Pressure is equal to _____. - CORRECT ANSWER: Gauge Pressure +
Atmospheric Pressure
According to NJ Mechanical Inspection Bureau rules, the boiler jurisdiction (regulation)
number must be placed on the ___ of each boiler - CORRECT ANSWER: Front
An indication of a dirty fuel oil strainer would be: - CORRECT ANSWER: Slight change
in pressure drop
As solids and alkalinity in boiler water increase: - CORRECT ANSWER: Waterside
scaling is increased
As the water in a hot water system expands: - CORRECT ANSWER: The pressure
remains constant
Automatic feedwater regulators are blown down how often? - CORRECT ANSWER:
Daily
Blowing down a boiler excessively will cause a loss of: - CORRECT ANSWER:
Blowdown heat
Boiler fittings are important for: - CORRECT ANSWER: Safety only
Boiler water having high alkalinity could develop: - CORRECT ANSWER: Caustic
embrittlement
Boiler water having high alkalinity will develop: - CORRECT ANSWER: Caustic
embrittlement
, Boiler water should have a pH of: - CORRECT ANSWER: 11
Boilers are equipped with combustion gas/fuel oil burners for: - CORRECT ANSWER:
More flexible operation
Bottom blowdown is best performed when the boiler is___. - CORRECT ANSWER:
Under light load
Carryover can lead to: - CORRECT ANSWER: Water Hammer
Carryover could be dangerous and cause: - CORRECT ANSWER: Water Hammer
Cast iron sectional boilers are built for what type of draft firing? - CORRECT ANSWER:
Mechanical forced and/or induced
Cast iron sectional boilers are built for what type of draft firing? - CORRECT ANSWER:
Mechanical forced and/or induced
Combination forced and induced draft is also known as ____ draft. - CORRECT
ANSWER: Balanced
Combustion air is controlled by: - CORRECT ANSWER: Inlet dampers, fan intake vanes
and fan speed
Cracking of the boiler metal along the seams can be caused by: - CORRECT ANSWER:
Oxygen pitting
Draft in a boiler is measured in ___. - CORRECT ANSWER: Inches of water
