LP INSTALLERS PRACTICE EXAM
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT RATED A+
Question 1
Where do you file a permit for work to be done in buildings owned or used by the
State of Massachusetts?
Answer: State Inspector (Office of Public Safety and Inspections / Division
of Occupational Licensure)
Question 2
When pressure testing a fuel gas piping system over 1,000,000 BTU, which rule
does NOT apply?
Answer: Test 1 hour for each 200' of developed length
Question 3
What is the minimum horizontal distance required from a regulator vent discharge
to a building opening located below it?
Answer: 3 feet
Question 4
How many renewal cycles must a licensed plumber or gas fitter keep their
continuing education certificates?
Answer: 3 cycles (6 years total)
Question 5
On an LP-Gas piping system, what component is legally defined as the "Point of
Delivery"?
Answer: The outlet of the 1st stage regulator
Question 6
How fast must a spill switch (thermal cutoff switch) respond and trip when
detecting flue gas spillage?
Answer: Within 30 seconds
Question 7
If the firing rate in a combustion chamber exceeds 1,000,000 BTU/hr, but is less
than 5,000,000 BTU/hr, what gas control valve configuration is required?
Answer: 2 shut-off valves in series, or one valve with an overtravel
interlock (proof-of-closure switch)
How fast does a spill switch need to work ? -ANSWER ✔✔30 seconds
, If the firing rate in a combustion chamber exceeds 1,000,000 BTU , but less than
5,000,000 , what is required ? -ANSWER ✔✔2 shut offs in series , or one with
overtravel interlock
When using gas pressure boosters , which of the following apply ? -ANSWER
✔✔All must meet product - acceptance requirements The serving gas supplier has
provided written authorization Gas pressure boosters shall be located in well -
ventilated spaces , and readily accessible
What percentage of vent height can the length of a single - walled vent connector
be ? -ANSWER ✔✔75 %
What percentage of vent height can the length of Type B , double - walled vent
connector be ? -ANSWER ✔✔100 %
What is the max pressure for natural gas in a house ? -ANSWER ✔✔14 " WC
Within how many feet of an appliance does the shut off need to be ? -ANSWER
✔✔6'
How far does a roof hatch need to be from the edge of a roof to not need guardrails
? -ANSWER ✔✔6'
What is the maximum pressure allowed for CSST . -ANSWER ✔✔14 " WC
If the maximum firing rate per combustion chamber is ____ , BTU or greater , gas
pressure supervision provided by listed pressure switches or combination high /
low switch , interlocked to accomplish safety shutdown in event of either high or
low pressure . -ANSWER ✔✔1,000,000
Max spacing for support for CSST on a rooftop is every . -ANSWER ✔✔Blocks
used for Support 48 "
A vacuum is considered to be any pressure that is -ANSWER ✔✔Less than
atmospheric pressure (14.7 psi)
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT RATED A+
Question 1
Where do you file a permit for work to be done in buildings owned or used by the
State of Massachusetts?
Answer: State Inspector (Office of Public Safety and Inspections / Division
of Occupational Licensure)
Question 2
When pressure testing a fuel gas piping system over 1,000,000 BTU, which rule
does NOT apply?
Answer: Test 1 hour for each 200' of developed length
Question 3
What is the minimum horizontal distance required from a regulator vent discharge
to a building opening located below it?
Answer: 3 feet
Question 4
How many renewal cycles must a licensed plumber or gas fitter keep their
continuing education certificates?
Answer: 3 cycles (6 years total)
Question 5
On an LP-Gas piping system, what component is legally defined as the "Point of
Delivery"?
Answer: The outlet of the 1st stage regulator
Question 6
How fast must a spill switch (thermal cutoff switch) respond and trip when
detecting flue gas spillage?
Answer: Within 30 seconds
Question 7
If the firing rate in a combustion chamber exceeds 1,000,000 BTU/hr, but is less
than 5,000,000 BTU/hr, what gas control valve configuration is required?
Answer: 2 shut-off valves in series, or one valve with an overtravel
interlock (proof-of-closure switch)
How fast does a spill switch need to work ? -ANSWER ✔✔30 seconds
, If the firing rate in a combustion chamber exceeds 1,000,000 BTU , but less than
5,000,000 , what is required ? -ANSWER ✔✔2 shut offs in series , or one with
overtravel interlock
When using gas pressure boosters , which of the following apply ? -ANSWER
✔✔All must meet product - acceptance requirements The serving gas supplier has
provided written authorization Gas pressure boosters shall be located in well -
ventilated spaces , and readily accessible
What percentage of vent height can the length of a single - walled vent connector
be ? -ANSWER ✔✔75 %
What percentage of vent height can the length of Type B , double - walled vent
connector be ? -ANSWER ✔✔100 %
What is the max pressure for natural gas in a house ? -ANSWER ✔✔14 " WC
Within how many feet of an appliance does the shut off need to be ? -ANSWER
✔✔6'
How far does a roof hatch need to be from the edge of a roof to not need guardrails
? -ANSWER ✔✔6'
What is the maximum pressure allowed for CSST . -ANSWER ✔✔14 " WC
If the maximum firing rate per combustion chamber is ____ , BTU or greater , gas
pressure supervision provided by listed pressure switches or combination high /
low switch , interlocked to accomplish safety shutdown in event of either high or
low pressure . -ANSWER ✔✔1,000,000
Max spacing for support for CSST on a rooftop is every . -ANSWER ✔✔Blocks
used for Support 48 "
A vacuum is considered to be any pressure that is -ANSWER ✔✔Less than
atmospheric pressure (14.7 psi)
