2026-2027 Frequently Tested Exam Questions With
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1. At what pressure would a relief valve blow off on a hot water boiler? -
ANSWER 30 psi
2. At what pressure would a relief valve blow off on a water heater? - ANSWER
150 psi
3. At what pressure would a relief valve blow off on a steam boiler? - ANSWER
15 psi
4. What control is used to control the pressure of a steam boiler? - ANSWER
Pressure control
5. What valve is used to prevent gravity flow in a hot water boiler system? -
ANSWER Flow check valve
6. If an oil tank is located 4 feet or more above an oil burner what valve is
needed? - ANSWER OSV or PRV
, 7. What would be used to pull oil from an oil tank to a burner? - ANSWER
Oil pump
8. What is the term that best describes the resistance to oil flow? - ANSWER
Viscosity
9. What prevents oil lines from plugging? - ANSWER Oil filter
10.A strap on limit control would be mounted where? - ANSWER Supply
line
11.What device would be shut off by the high limit? - ANSWER Burner
12.What are the three functions of the fan/limit control - ANSWER Fan off,
fan on, shut off burner at high limit
13.What is the normal operating pressure of a steam system? - ANSWER 2
psi
14.What is the main function of the primary control? - ANSWER Safety and
react to light
15.If oil pressure is set to 100 psig what should the cut off pressure be? -
ANSWER 20%; 80 psi