G2 GAS TECHNICIAN MODULE 15 B
REVISED QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT RATED A+
What are the primary functions of a gas pressure regulator?
a. Decreases and maintains steady downstream pressure ✔✔
b. Enables precise pressure adjustments for connected equipment ✔✔
c. Delivers a steady, uniform gas flow ✔✔
Answer: Decreases and maintains steady downstream pressure; enables precise
pressure adjustments; delivers a steady, uniform gas flow. ✔✔
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What three key forces operate within a gas regulator?
a. Measuring element (diaphragm) ✔✔
b. Restricting element (orifice and valve seat) ✔✔
c. Loading element (adjusting spring) ✔✔
Answer: Measuring element (diaphragm), restricting element (orifice/seat), and
loading element (spring). ✔✔
═════════════════════════════════════════════
Which internal pressure provides the closing force inside a regulator?
a. Upstream inlet pressure
b. Downstream outlet gas pressure ✔✔
c. Atmospheric spring pressure
d. Vent line backpressure
Answer: Downstream outlet gas pressure ✔✔
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What key purpose does a regulator vent serve?
a. Permits air movement above the diaphragm for smooth operation ✔✔
b. Relieves gas safely if the diaphragm ruptures or overpressurization occurs ✔✔
c. Accommodates a leak-limiting device to restrict discharge upon failure ✔✔
Answer: Permits air movement for diaphragm movement, vents excess gas during
overpressure or failure, and accommodates leak-limiting devices. ✔✔
What does a cent limiting orifice do? What is the drill size? How much gas per
hour will it allow to pass? -ANSWER ✔✔1. Allows airflow in and out of the top
of the regulator.
, 2. Normally #78 drill size.
3. Will allow one cubic foot per hour gas to pass?(propane)
How do you mount a disc limiting orifice? -ANSWER ✔✔Vertically mounted for
proper install
When do you use a surge limiting device? How does it work? -ANSWER ✔✔Used
when a regulator is required to be slow opening. Uses a ball to restrict the flow of
air.
What does a service regulator do? -ANSWER ✔✔Reduces service pressure down
to supply pressure.
What does an appliance regulator do? -ANSWER ✔✔Reduces supply pressure to
manifold pressure
Where is the system regulator located? -ANSWER ✔✔Located between the
service and appliance regulator. Also known as the low pressure regulator or zone
regulator
What does a first stage regulator do? -ANSWER ✔✔Reduces tank pressure down
to service pressure. (Propane) 250 psig - 10 psig
What does a second stage regulator do? -ANSWER ✔✔Reduces service pressure
down to supply line pressure. (Propane) 10 psig - 11" w.c.
How does a twin stage regulator work and what does it do? -ANSWER ✔✔Has
two stages of pressure regulation in one device. Reduces tank pressure to supply
pressure. 250 psig - 11" w.c.
What does a single stage regulator do? -ANSWER ✔✔Reduces tank pressure to
supply pressure through one orifice.
In Ontario what type of regulation must be used in all permanent propane
installations? -ANSWER ✔✔Must have two-stage regulation
REVISED QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT RATED A+
What are the primary functions of a gas pressure regulator?
a. Decreases and maintains steady downstream pressure ✔✔
b. Enables precise pressure adjustments for connected equipment ✔✔
c. Delivers a steady, uniform gas flow ✔✔
Answer: Decreases and maintains steady downstream pressure; enables precise
pressure adjustments; delivers a steady, uniform gas flow. ✔✔
═════════════════════════════════════════════
What three key forces operate within a gas regulator?
a. Measuring element (diaphragm) ✔✔
b. Restricting element (orifice and valve seat) ✔✔
c. Loading element (adjusting spring) ✔✔
Answer: Measuring element (diaphragm), restricting element (orifice/seat), and
loading element (spring). ✔✔
═════════════════════════════════════════════
Which internal pressure provides the closing force inside a regulator?
a. Upstream inlet pressure
b. Downstream outlet gas pressure ✔✔
c. Atmospheric spring pressure
d. Vent line backpressure
Answer: Downstream outlet gas pressure ✔✔
═════════════════════════════════════════════
What key purpose does a regulator vent serve?
a. Permits air movement above the diaphragm for smooth operation ✔✔
b. Relieves gas safely if the diaphragm ruptures or overpressurization occurs ✔✔
c. Accommodates a leak-limiting device to restrict discharge upon failure ✔✔
Answer: Permits air movement for diaphragm movement, vents excess gas during
overpressure or failure, and accommodates leak-limiting devices. ✔✔
What does a cent limiting orifice do? What is the drill size? How much gas per
hour will it allow to pass? -ANSWER ✔✔1. Allows airflow in and out of the top
of the regulator.
, 2. Normally #78 drill size.
3. Will allow one cubic foot per hour gas to pass?(propane)
How do you mount a disc limiting orifice? -ANSWER ✔✔Vertically mounted for
proper install
When do you use a surge limiting device? How does it work? -ANSWER ✔✔Used
when a regulator is required to be slow opening. Uses a ball to restrict the flow of
air.
What does a service regulator do? -ANSWER ✔✔Reduces service pressure down
to supply pressure.
What does an appliance regulator do? -ANSWER ✔✔Reduces supply pressure to
manifold pressure
Where is the system regulator located? -ANSWER ✔✔Located between the
service and appliance regulator. Also known as the low pressure regulator or zone
regulator
What does a first stage regulator do? -ANSWER ✔✔Reduces tank pressure down
to service pressure. (Propane) 250 psig - 10 psig
What does a second stage regulator do? -ANSWER ✔✔Reduces service pressure
down to supply line pressure. (Propane) 10 psig - 11" w.c.
How does a twin stage regulator work and what does it do? -ANSWER ✔✔Has
two stages of pressure regulation in one device. Reduces tank pressure to supply
pressure. 250 psig - 11" w.c.
What does a single stage regulator do? -ANSWER ✔✔Reduces tank pressure to
supply pressure through one orifice.
In Ontario what type of regulation must be used in all permanent propane
installations? -ANSWER ✔✔Must have two-stage regulation
