G2 Gas Technician Module 20 Revised
Test Questions and answers with 100%
Complete Solutions | verified &updated
2024
What two types of drive heads can be used on a thermostatic radiator valve? -
✔✔Mechanical and electrical
On three and four-way mixing valves, where does the mixing take place? -
✔✔Within the valve body
Where should an outdoor temperature sensor be placed? - ✔✔Away from direct
sunlight, away from other heat sources and away from a shielding structure
What are the three general methods used to control temperature zones in a
building? - ✔✔Circulating pumps, zone valves, and thermostatic radiator valves
, What is the purpose of a balancing valve? - ✔✔Modulate and balance the
flow through each branch
Where is the circulating pump in a hydronic system located? - ✔✔Typically on
the supply side
The pressure difference produced by a pump between it's inlet and outlet ports is
a partial definition of what? - ✔✔Pump Head
If two identical pumps are installed in series, what happens to the system
pressure? - ✔✔Pressure Increases
What happens if the same pumps are installed in parallel? - ✔✔GPM Increases
If a check valve chatters, what must be done? - ✔✔Must be replaced
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