Exam (elaborations)
B gas fitters course- Questions and Answers
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B gas fitters course- Questions and Answers
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B gas fitters course- Questions andAnswers
Thermocouple closed circuit test (under load) will generate how many millivolts? Correct
Ans-10-15 millivolts dc
Max BTU Input for thermocouple? Correct Ans-400,000 BTU
Main burner turn down test Correct Ans-Burners lowest input cannot go lower than 1/3 of
gas pressure to the burner
Flame lifting Correct Ans-Flame lifts off burner
Caused by fuel/air mixture velocities exceeding flame speed
Controlled by adjusting primary Air and check manifold pressure
Flash back Correct Ans-Flame travels back into burner
Caused by fuel/air mixture below flame speed
Controlled by adjusting the primary air and check manifold pressure
Carbonizing flame Correct Ans-Flame that is too rich in fuel and not enough air
Oxidizing flame Correct Ans-Flame that is starved of fuel and Too much oxygen or air
, OPD regulator Correct Ans-For systems with inlet pressure above 2 psi
5 psi inlet > 7-11 " w.c. Outlet
Limits down stream pressure in case of regulator failure
Pilot operated valve Correct Ans-For larger systems
1-10% droop
More accurate than direct operated valve
Direct operated valve Correct Ans-Limited to 2"
10-20% droop
Line regulator Correct Ans-Regulates after the meter
Soft valve seat for 100% shut off
Internal safety relief
Propane first stage regulator Correct Ans-From tank to line, knocks down pressure to 10 psi
to second regulator (red)
Propane second stage regulator Correct Ans-Installed downstream of first regulator, knocks
down pressure to 11 inches water column
(Green)
cathodic protection Correct Ans-a method in which an active metal, such as magnesium, is
connected to steel to protect it from corrosion
Standard conditions for gas Correct Ans-14.73 psi and 60°F
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