NJ Black Seal Exam Preparation Version 3 Newest
2026-2027 With Complete Questions And Correct
Detailed Answers| Brand New Version!
As solids and alkalinity in boiler water increase. - ANSWER-Waterside
scaling is increased.
What chemical would be used to control scale in a low pressure boiler?
- ANSWER-Phosphate
What will excessive oxygen in the boiler water cause? - ANSWER-Pitting
of boiler metal
By N.J.A.C 12:90 what is the minimum thickness allowed for
atmospheric blowdown tank? - ANSWER-5/16 inch
In the state of NJ, when is it permissible to have only one bottom blow
off valve? - ANSWER-When MWAP does not exceed 100 PSI
1|Page
,N.J.A.C requires the sewer lines be protected from high temperatures
and pressure from boiler blow off lines. - ANSWER-A blowdown tank
What effect would frequent blowing down of a boiler have on a system?
- ANSWER-Blow down heat loss.
The maximum size of the bottom blowdown line and surface line? -
ANSWER-2.5 inch
As the firing rate increases in a boiler equipped with a convection
superheater, the steam temperature - ANSWER-Increases
Before a hydrostatic test is performed on a boiler, each safety valve
should be: - ANSWER-Held to its seat by means of a testing clamp
What boiler should never be subjected to an accumulation test? -
ANSWER-A boiler equipped with a super heater
What is the difference between the set-point pressure at which a safety
valve opens at the pressure at which this valve closes? - ANSWER-
Blowback
2|Page
, What is the function of a dry pipe in a boiler? - ANSWER-Remove
moisture from steam drum
What part of a safety valve is used to ensure the valve seats properly. -
ANSWER-Guides and bushings
A safety valve data nameplate suggests that the orifice opening on the
valve is 1.5 inch with a set pressure 98 PSIG. What is the total force? -
ANSWER-173 LBS (1.5X1.5) X .7854 X 98
If a boiler has an opening pressure of 345 PSI and a 2 1/2 in diameter
what is the total force? - ANSWER-(2.5X2.5) X .7854 x345
If one atmosphere is about 14.7 PSIA, what is the standard barometer
reading at sea level? - ANSWER-760 MM. HG
If steam were reduced by a PRV from 500 PSI to 125 PSI, the steam at
125 would have? - ANSWER-The same heat as at 500 PSI
In steam piping, which type of steam trap has no moving parts? -
ANSWER-The continuous flow type
3|Page
2026-2027 With Complete Questions And Correct
Detailed Answers| Brand New Version!
As solids and alkalinity in boiler water increase. - ANSWER-Waterside
scaling is increased.
What chemical would be used to control scale in a low pressure boiler?
- ANSWER-Phosphate
What will excessive oxygen in the boiler water cause? - ANSWER-Pitting
of boiler metal
By N.J.A.C 12:90 what is the minimum thickness allowed for
atmospheric blowdown tank? - ANSWER-5/16 inch
In the state of NJ, when is it permissible to have only one bottom blow
off valve? - ANSWER-When MWAP does not exceed 100 PSI
1|Page
,N.J.A.C requires the sewer lines be protected from high temperatures
and pressure from boiler blow off lines. - ANSWER-A blowdown tank
What effect would frequent blowing down of a boiler have on a system?
- ANSWER-Blow down heat loss.
The maximum size of the bottom blowdown line and surface line? -
ANSWER-2.5 inch
As the firing rate increases in a boiler equipped with a convection
superheater, the steam temperature - ANSWER-Increases
Before a hydrostatic test is performed on a boiler, each safety valve
should be: - ANSWER-Held to its seat by means of a testing clamp
What boiler should never be subjected to an accumulation test? -
ANSWER-A boiler equipped with a super heater
What is the difference between the set-point pressure at which a safety
valve opens at the pressure at which this valve closes? - ANSWER-
Blowback
2|Page
, What is the function of a dry pipe in a boiler? - ANSWER-Remove
moisture from steam drum
What part of a safety valve is used to ensure the valve seats properly. -
ANSWER-Guides and bushings
A safety valve data nameplate suggests that the orifice opening on the
valve is 1.5 inch with a set pressure 98 PSIG. What is the total force? -
ANSWER-173 LBS (1.5X1.5) X .7854 X 98
If a boiler has an opening pressure of 345 PSI and a 2 1/2 in diameter
what is the total force? - ANSWER-(2.5X2.5) X .7854 x345
If one atmosphere is about 14.7 PSIA, what is the standard barometer
reading at sea level? - ANSWER-760 MM. HG
If steam were reduced by a PRV from 500 PSI to 125 PSI, the steam at
125 would have? - ANSWER-The same heat as at 500 PSI
In steam piping, which type of steam trap has no moving parts? -
ANSWER-The continuous flow type
3|Page
