Black Seal: Class 4 Boiler- Test
Questions With 100% Accurate
Answers 2026 Updated.
_______________are the most important valves on the boiler - Answer Safety Valves
highest part of the steam side of the boiler. - Answer Safety valves are located on the
Only spring-loaded pop type valves are allowed for a ________ - Answer safety valve
ASME code requires at least__________safety valve on every boiler. - Answer one
Boilers with more than______ of heating surface shall have two or more safety valves - Answer
500 SQ FT
Safety valves over 3" in diameter for pressures over 15 PSI shall have a - Answer flanged or
weld-end inlet.
_______________must direct proper discharge of steam away from operator and not put strain
on safety valve - Answer Safety valve piping
used to express the electrical pressure differential between two points of a conductor i.e. water
pressure required to make water flow in a pipe. - Answer Volt
used to express the number of electrons flowing through a conductor per unit of time i.e. flow
of water measured through a pipe measured in gallons per minute. - Answer Ampere
basic unit of electrical power. Watts= volts X amperage - Answer Watt
used to express resistance to the flow of electrons in a conductor i.e. friction that occurs in
pipes as water flows through. - Answer Ohm
electrons flowing only one way in a circuit. They have a positive and negative terminal. Best
example is a battery or photocell. - Answer D.C.-direct current
electron flow that reverses its direction at regular intervals of time. - Answer A.C.- alternating
current
,______is either single phase or three-phrase and is commonly found in building wiring. -
Answer A.C.-alternating current
material that promotes free flow of electrons such as copper or aluminum. - Answer Electrical
conductor
material that does not allow free flow of electrons such as wood or rubber. - Answer Electrical
insulator
____________must be mounted directly to the boiler or water column. - Answer Glass gauges.
Tubular gauges are used up to 250 PSI and flat gauges for pressures over 250 PSI.
Glass gauge is located at the ______ so the gauge glass is _______ above the highest heating
surface on a fire tube boiler. - Answer A) NOWL B) 2-3"
The _____________must be located so the lowest part of the gauge glass is 3" above the lowest
safe operating water level. - Answer water column
Pressures over __________ require two separate means of checking water level, either two
direct-reading water gauges or two remote views with one direct-reading gauge. - Answer 400
PSI
To maintain, clean and test a gauge glass: - Answer 1)Close steam and water valves on water
column or gauge glass. 2)Open drain valve fully, drain and then crack steam valve and allow
gentle rush of steam to pass through water column or gauge glass (>20 sec.) 3)Close steam
valve, inspect and repeat until clean. 4)Close blow down valve and simultaneously open steam
and water valves, slowly bringing back to normal operating level.
If _____________ top line is clogged or closed glass will show as full. - Answer glass gauge If
bottom line is clogged or closed water will show as stationary and slowly fill up due to steam
condensation.
Glass gauges should be blown down and tested at least _________and preferably each
________change. - Answer A) once a day B) shift
Glass gauges must be connected with minimum ___________, one valve at the top and one
valve at the bottom of the gauge glass so removal/replacement is possible while the boiler is
under pressure and have a minimum____ blow down valve preferably with piping directing
discharge away from the operator. - Answer A) ½" piping B) ¼"
,The water column is used to___________ of boiler water so accurate readings of the water level
in the glass gauge can be taken. - Answer slow down turbulence
The water column is connected with minimum___ piping and have a minimum____ blow down
valve. - Answer A) 1" B) 1/4"
All 90* connections going to water column must be fitted with _____ for cleaning. - Answer
tees
For pressures over _______ all lower piping must have a shield or sleeve to reduce effect
temperature differentials - Answer 400 PSI
Valves between boiler and water column must be _____________ that show if the valve is open
or closed. - Answer os&y or lever type
Valves on the water column should be ____________. Some areas don't allow valves between
the boiler and water column. - Answer locked open
The_____________ is located at the highest part of the steam side of the boiler and each boiler
must have it's own. It must be clearly visible, well lighted and protected from heat and cold. -
Answer steam pressure gauge
A steam pressure gauge is used to indicate ____________ in the boiler. - Answer steam
pressure
Steam pressure gauges must have a ______ that protects the Bourdon tube from live steam. -
Answer siphon or pig tail
¼" _________ pipe can be used for temperatures up to 450* F on steam gauges. - Answer
brass or copper
Steel or wrought iron piping must be at least ____and minimum I.D. of ______. - Answer A) ½"
B) ¼"
Stem pressure gauges must have a ¼" branch connection with valve for attaching a
_____________. - Answer test gauge
Steam pressure gauge must be between ____________ times the safety valve setting - Answer
1 ½ and 2
, Hydrostatic testing raises the boiler pressure______ times the MAWP. - Answer 1 ½
A steam pressure gauge must be graduated so the pointer is in near ____________at normal
operating pressure. - Answer vertical position
A shut off valve on a steam gauge must be of the__________where you can easily see if it is
open or closed. - Answer lever type
Some municipals don't allow _________ between the boiler and steam gauge. - Answer valves
Steam pressure gauges can be damaged when: - Answer 1.Over pressured. 2.Subjected to over
vibration. 3.Subjected to high heat. 4.Pressure applied to fast can damage Bourbon tube.
True or False. To maintain gauges replace broken glass to keep dirt out of mechanical parts, only
use high quality gauge oil as regular oil attracts dirt and is detrimental to gauge operation. -
Answer TRUE
Pressure gauges shall be tested quarterly or when any irregularity is observed using
a_____________ or test gauge constructed for the purpose of testing gauges. - Answer dead
weight tester
Steam pressure gauges use _____ and a _________ tube to measure steam pressure in the
boiler. - Answer A) PSI B) Bourbon
___________ consist of valves, piping, control system and auxiliary equipment that provides
water at the correct temperature and pressure to the boiler. - Answer Feedwater systems
Seamless Schedule 80 steel pipe must be used in boilers operating over ____________ - Answer
100 PSI or 220F.
A____________ is used to add make up water due to loss of condensate due to leaks and
evaporation. - Answer float control
_____________ consists of stop valves, check valves, gate valves and feedwater regulators. -
Answer Feedwater piping
Questions With 100% Accurate
Answers 2026 Updated.
_______________are the most important valves on the boiler - Answer Safety Valves
highest part of the steam side of the boiler. - Answer Safety valves are located on the
Only spring-loaded pop type valves are allowed for a ________ - Answer safety valve
ASME code requires at least__________safety valve on every boiler. - Answer one
Boilers with more than______ of heating surface shall have two or more safety valves - Answer
500 SQ FT
Safety valves over 3" in diameter for pressures over 15 PSI shall have a - Answer flanged or
weld-end inlet.
_______________must direct proper discharge of steam away from operator and not put strain
on safety valve - Answer Safety valve piping
used to express the electrical pressure differential between two points of a conductor i.e. water
pressure required to make water flow in a pipe. - Answer Volt
used to express the number of electrons flowing through a conductor per unit of time i.e. flow
of water measured through a pipe measured in gallons per minute. - Answer Ampere
basic unit of electrical power. Watts= volts X amperage - Answer Watt
used to express resistance to the flow of electrons in a conductor i.e. friction that occurs in
pipes as water flows through. - Answer Ohm
electrons flowing only one way in a circuit. They have a positive and negative terminal. Best
example is a battery or photocell. - Answer D.C.-direct current
electron flow that reverses its direction at regular intervals of time. - Answer A.C.- alternating
current
,______is either single phase or three-phrase and is commonly found in building wiring. -
Answer A.C.-alternating current
material that promotes free flow of electrons such as copper or aluminum. - Answer Electrical
conductor
material that does not allow free flow of electrons such as wood or rubber. - Answer Electrical
insulator
____________must be mounted directly to the boiler or water column. - Answer Glass gauges.
Tubular gauges are used up to 250 PSI and flat gauges for pressures over 250 PSI.
Glass gauge is located at the ______ so the gauge glass is _______ above the highest heating
surface on a fire tube boiler. - Answer A) NOWL B) 2-3"
The _____________must be located so the lowest part of the gauge glass is 3" above the lowest
safe operating water level. - Answer water column
Pressures over __________ require two separate means of checking water level, either two
direct-reading water gauges or two remote views with one direct-reading gauge. - Answer 400
PSI
To maintain, clean and test a gauge glass: - Answer 1)Close steam and water valves on water
column or gauge glass. 2)Open drain valve fully, drain and then crack steam valve and allow
gentle rush of steam to pass through water column or gauge glass (>20 sec.) 3)Close steam
valve, inspect and repeat until clean. 4)Close blow down valve and simultaneously open steam
and water valves, slowly bringing back to normal operating level.
If _____________ top line is clogged or closed glass will show as full. - Answer glass gauge If
bottom line is clogged or closed water will show as stationary and slowly fill up due to steam
condensation.
Glass gauges should be blown down and tested at least _________and preferably each
________change. - Answer A) once a day B) shift
Glass gauges must be connected with minimum ___________, one valve at the top and one
valve at the bottom of the gauge glass so removal/replacement is possible while the boiler is
under pressure and have a minimum____ blow down valve preferably with piping directing
discharge away from the operator. - Answer A) ½" piping B) ¼"
,The water column is used to___________ of boiler water so accurate readings of the water level
in the glass gauge can be taken. - Answer slow down turbulence
The water column is connected with minimum___ piping and have a minimum____ blow down
valve. - Answer A) 1" B) 1/4"
All 90* connections going to water column must be fitted with _____ for cleaning. - Answer
tees
For pressures over _______ all lower piping must have a shield or sleeve to reduce effect
temperature differentials - Answer 400 PSI
Valves between boiler and water column must be _____________ that show if the valve is open
or closed. - Answer os&y or lever type
Valves on the water column should be ____________. Some areas don't allow valves between
the boiler and water column. - Answer locked open
The_____________ is located at the highest part of the steam side of the boiler and each boiler
must have it's own. It must be clearly visible, well lighted and protected from heat and cold. -
Answer steam pressure gauge
A steam pressure gauge is used to indicate ____________ in the boiler. - Answer steam
pressure
Steam pressure gauges must have a ______ that protects the Bourdon tube from live steam. -
Answer siphon or pig tail
¼" _________ pipe can be used for temperatures up to 450* F on steam gauges. - Answer
brass or copper
Steel or wrought iron piping must be at least ____and minimum I.D. of ______. - Answer A) ½"
B) ¼"
Stem pressure gauges must have a ¼" branch connection with valve for attaching a
_____________. - Answer test gauge
Steam pressure gauge must be between ____________ times the safety valve setting - Answer
1 ½ and 2
, Hydrostatic testing raises the boiler pressure______ times the MAWP. - Answer 1 ½
A steam pressure gauge must be graduated so the pointer is in near ____________at normal
operating pressure. - Answer vertical position
A shut off valve on a steam gauge must be of the__________where you can easily see if it is
open or closed. - Answer lever type
Some municipals don't allow _________ between the boiler and steam gauge. - Answer valves
Steam pressure gauges can be damaged when: - Answer 1.Over pressured. 2.Subjected to over
vibration. 3.Subjected to high heat. 4.Pressure applied to fast can damage Bourbon tube.
True or False. To maintain gauges replace broken glass to keep dirt out of mechanical parts, only
use high quality gauge oil as regular oil attracts dirt and is detrimental to gauge operation. -
Answer TRUE
Pressure gauges shall be tested quarterly or when any irregularity is observed using
a_____________ or test gauge constructed for the purpose of testing gauges. - Answer dead
weight tester
Steam pressure gauges use _____ and a _________ tube to measure steam pressure in the
boiler. - Answer A) PSI B) Bourbon
___________ consist of valves, piping, control system and auxiliary equipment that provides
water at the correct temperature and pressure to the boiler. - Answer Feedwater systems
Seamless Schedule 80 steel pipe must be used in boilers operating over ____________ - Answer
100 PSI or 220F.
A____________ is used to add make up water due to loss of condensate due to leaks and
evaporation. - Answer float control
_____________ consists of stop valves, check valves, gate valves and feedwater regulators. -
Answer Feedwater piping
