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TSSA G2 Practice Questions (Units 10-16)
Questions and Answers Latest 2026
(10) What is a Servo? Ans: A
mechanism set in motion by other
mechanisms
(10) What is Setpoint? Ans: The desired outlet perssure
(10) Which regulator is more accurate; pilot operated or
direct operated? Ans: Pilot operated
(10) In which applications are pilot operated regulators
normally employed other than servo regulation? Ans:
High capacity applications in commercial, institutional,
and industrial settings.
(10) How is the accuracy of a regulator determined? Ans:
The amount of flow it can pass for a given amount of
droop determines the accuracy of a regulator. The closer
the regulator is to setpoint, the more accurate it is.
P2 - If the reading is 144 V what should you do? Ans:
Move the ground to the other terminal of the secondary
and the reading between L1 and the ungrounded side of
the secondary will read 96 V
© 2025 All rights reserved
, 2 | Page
(10) What are the four factors that may affect droop?
Ans: Spring rate, diaphragm rate, orifice size, and inlet
pressure
(10) In many service and line pressure regulators how can
you change the flow capacity? Ans: By changing the
orifice size
(10) Which way should the adjustment screw be turned to
increase downstream pressure? Ans: Clockwise
(10) Where shouldn't leak limiting devices installed and
why? Ans: Outdoors, because if they are exposed to the
outdoors they may become clogged by moisture or
insects.
(10) What is the pitot tube design used for? Ans: To
decrease regulator droop
(10) Line pressure regulators for use on systems with an
inlet pressure over 0.5 psi must be of what type? Ans:
Positive shut-off type
(10) What drill size opening do most small appliance
regulators vent through to the indoors (in a ventilated
area). Ans: #78 Drill size
(10) For piping systems over 2 psi, a line pressure
regulator must be equipped with __________ or
___________. Ans: A line relief device or an overpressure
protection device
© 2025 All rights reserved
, 3 | Page
(10) What are the minimum and maximum hydrostatic
relief device pressures on liquid propane systems? Ans:
375 psi and 500 psi
(10) What are the typical upstream and manifold gas
pressures for NG and LP Ans: LP: 13" w.c. upstream, 11"
w.c. manifold
NG: 7" w.c. upstream, 3.5" w.c. manifold
(10) After a gas piping system has been installed, how
many pressure tests are required and when? Ans: The
first before any appliances are installed and the second
after all the appliances are installed
(10) All piping and components must be _____________
and ___________before being concealed Ans: inspected
and tested
(10) How do you check for seepage at the gas meter? Ans:
Release a small amount of gas from the system at static
pressure (with the supply valve in the fully closed
position) then wait to see if the pressure creeps back up
(10) Piping shall __________ before entry into a building
unless otherwise authorized by the authority having
jurisdiction Ans: Rise above grade
(10) Piping may not pass under a ________ or _________
Ans: Footing or building wall
(10) How shall movable commercial cooking appliances
be connected to gas lines and what standard covers this
© 2025 All rights reserved
TSSA G2 Practice Questions (Units 10-16)
Questions and Answers Latest 2026
(10) What is a Servo? Ans: A
mechanism set in motion by other
mechanisms
(10) What is Setpoint? Ans: The desired outlet perssure
(10) Which regulator is more accurate; pilot operated or
direct operated? Ans: Pilot operated
(10) In which applications are pilot operated regulators
normally employed other than servo regulation? Ans:
High capacity applications in commercial, institutional,
and industrial settings.
(10) How is the accuracy of a regulator determined? Ans:
The amount of flow it can pass for a given amount of
droop determines the accuracy of a regulator. The closer
the regulator is to setpoint, the more accurate it is.
P2 - If the reading is 144 V what should you do? Ans:
Move the ground to the other terminal of the secondary
and the reading between L1 and the ungrounded side of
the secondary will read 96 V
© 2025 All rights reserved
, 2 | Page
(10) What are the four factors that may affect droop?
Ans: Spring rate, diaphragm rate, orifice size, and inlet
pressure
(10) In many service and line pressure regulators how can
you change the flow capacity? Ans: By changing the
orifice size
(10) Which way should the adjustment screw be turned to
increase downstream pressure? Ans: Clockwise
(10) Where shouldn't leak limiting devices installed and
why? Ans: Outdoors, because if they are exposed to the
outdoors they may become clogged by moisture or
insects.
(10) What is the pitot tube design used for? Ans: To
decrease regulator droop
(10) Line pressure regulators for use on systems with an
inlet pressure over 0.5 psi must be of what type? Ans:
Positive shut-off type
(10) What drill size opening do most small appliance
regulators vent through to the indoors (in a ventilated
area). Ans: #78 Drill size
(10) For piping systems over 2 psi, a line pressure
regulator must be equipped with __________ or
___________. Ans: A line relief device or an overpressure
protection device
© 2025 All rights reserved
, 3 | Page
(10) What are the minimum and maximum hydrostatic
relief device pressures on liquid propane systems? Ans:
375 psi and 500 psi
(10) What are the typical upstream and manifold gas
pressures for NG and LP Ans: LP: 13" w.c. upstream, 11"
w.c. manifold
NG: 7" w.c. upstream, 3.5" w.c. manifold
(10) After a gas piping system has been installed, how
many pressure tests are required and when? Ans: The
first before any appliances are installed and the second
after all the appliances are installed
(10) All piping and components must be _____________
and ___________before being concealed Ans: inspected
and tested
(10) How do you check for seepage at the gas meter? Ans:
Release a small amount of gas from the system at static
pressure (with the supply valve in the fully closed
position) then wait to see if the pressure creeps back up
(10) Piping shall __________ before entry into a building
unless otherwise authorized by the authority having
jurisdiction Ans: Rise above grade
(10) Piping may not pass under a ________ or _________
Ans: Footing or building wall
(10) How shall movable commercial cooking appliances
be connected to gas lines and what standard covers this
© 2025 All rights reserved
