TSSA G2 Practice Questions (Units 10-
16)
(10) What is a Servo? - answer A mechanism set in motion by other mechanisms
(10) What is Setpoint? - answer The desired outlet pressure
(10) Which regulator is more accurate; pilot operated or direct operated? - answer Pilot
operated
(10) In which applications are pilot operated regulators normally employed other than
servo regulation? - answer High-capacity applications in commercial, institutional, and
industrial settings.
(10) How is the accuracy of a regulator determined? - answer 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? - answer 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
(10) What are the four factors that may affect droop? - answerSpring rate, diaphragm
rate, orifice size, and inlet pressure
(10) In many service and line pressure regulators how can you change the flow
capacity? - answerBy changing the orifice size
(10) Which way should the adjustment screw be turned to increase downstream
pressure? - answerClockwise
(10) Where shouldn't leak limiting devices installed and why? - answerOutdoors,
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? - answerTo decrease regulator droop
(10) Line pressure regulators for use on systems with an inlet pressure over 0.5 psi
must be of what type? - answerPositive shut-off type
(10) What drill size opening do most small appliance regulators vent through to the
indoors (in a ventilated area). - answer#78 Drill size
, (10) For piping systems over 2 psi, a line pressure regulator must be equipped with
__________ or ___________. - answerA line relief device or an overpressure protection
device
(10) What are the minimum and maximum hydrostatic relief device pressures on liquid
propane systems? - answer375 psi and 500 psi
(10) What are the typical upstream and manifold gas pressures for NG and LP -
answerLP: 13" w.c. upstream, 11" w.c. manifold
NG: 7" w.c. upstream, 3.5" w.c. manifold
(10) - answer
(10) After a gas piping system has been installed, how many pressure tests are required
and when? - answerThe 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 - answerinspected and tested
(10) How do you check for seepage at the gas meter? - answerRelease 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 - answerRise above grade
(10) Piping may not pass under a ________ or _________ - answerFooting or building
wall
(10) How shall movable commercial cooking appliances be connected to gas lines and
what standard covers this connection? - answerIt shall be connected by a certified
connector complying with standard CAN/CSA-6.16
(10) When a metal connector is used with a commercial cooking appliance on wheels or
rollers what shall be provided to protect the connector? - answerA non combustible
restraining device
(10) Steel gas piping must conform to which ASTM standards? - answerASTM A53 or
A106
(10) Schedule 40 and Schedule 80 pipe have the same ________________. -
answerOutside diameter
(10) What is the melting point of the fusible plug on an acetylene cylinder? - answer100
Degrees Celsius (212 Degrees Fahrenheit)
16)
(10) What is a Servo? - answer A mechanism set in motion by other mechanisms
(10) What is Setpoint? - answer The desired outlet pressure
(10) Which regulator is more accurate; pilot operated or direct operated? - answer Pilot
operated
(10) In which applications are pilot operated regulators normally employed other than
servo regulation? - answer High-capacity applications in commercial, institutional, and
industrial settings.
(10) How is the accuracy of a regulator determined? - answer 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? - answer 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
(10) What are the four factors that may affect droop? - answerSpring rate, diaphragm
rate, orifice size, and inlet pressure
(10) In many service and line pressure regulators how can you change the flow
capacity? - answerBy changing the orifice size
(10) Which way should the adjustment screw be turned to increase downstream
pressure? - answerClockwise
(10) Where shouldn't leak limiting devices installed and why? - answerOutdoors,
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? - answerTo decrease regulator droop
(10) Line pressure regulators for use on systems with an inlet pressure over 0.5 psi
must be of what type? - answerPositive shut-off type
(10) What drill size opening do most small appliance regulators vent through to the
indoors (in a ventilated area). - answer#78 Drill size
, (10) For piping systems over 2 psi, a line pressure regulator must be equipped with
__________ or ___________. - answerA line relief device or an overpressure protection
device
(10) What are the minimum and maximum hydrostatic relief device pressures on liquid
propane systems? - answer375 psi and 500 psi
(10) What are the typical upstream and manifold gas pressures for NG and LP -
answerLP: 13" w.c. upstream, 11" w.c. manifold
NG: 7" w.c. upstream, 3.5" w.c. manifold
(10) - answer
(10) After a gas piping system has been installed, how many pressure tests are required
and when? - answerThe 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 - answerinspected and tested
(10) How do you check for seepage at the gas meter? - answerRelease 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 - answerRise above grade
(10) Piping may not pass under a ________ or _________ - answerFooting or building
wall
(10) How shall movable commercial cooking appliances be connected to gas lines and
what standard covers this connection? - answerIt shall be connected by a certified
connector complying with standard CAN/CSA-6.16
(10) When a metal connector is used with a commercial cooking appliance on wheels or
rollers what shall be provided to protect the connector? - answerA non combustible
restraining device
(10) Steel gas piping must conform to which ASTM standards? - answerASTM A53 or
A106
(10) Schedule 40 and Schedule 80 pipe have the same ________________. -
answerOutside diameter
(10) What is the melting point of the fusible plug on an acetylene cylinder? - answer100
Degrees Celsius (212 Degrees Fahrenheit)
