Minnesota Special Engineer Boiler License Practice Exam: Questions & Answers: Guaranteed A+ Score Solution

What device must be located between a hot water boiler and the expansion tank? (Ans- A shut off valve so the expansion can be isolated and drained during operation of the boiler. On a hot water boiler, every time the burner operates the safety relief valve opens. Why? (Ans- The expansion tank is water logged, or the isolating valve for the expansion tank is closed. An Aquastat is used on a...? (Ans- Hot water boiler To reduce thermal shock on hot water boilers, what devices are used? (Ans- Low limit or low fire hold control, three way valve, run around pump. On a steam boiler the control named operator will... (Ans- On pressure decrease: Start. On pressure increase: Stop. On a hot water boiler the control called the operator will... (Ans- On temperature decrease: Start. On temperature increase: Stop. On a steam boiler what is a siphon or pigtail used for? (Ans- To protect the steam gauge from too high of temperature. What is one reason causing the expansion tank to fill with water? (Ans- Air leaks from the gauge glass fitting. What would you do if you cam into a boiler room and found no water in the boiler? (Ans- Shut off the burner and allow boiler to cool. What is the purpose of the bottom blow down on a steam boiler? (Ans- To remove sludge and sediment and to drain the boiler.