Low Pressure Boiler License |139 questions with correct answers

Name the most frequent cause for failure on cast iron boilers? CORRECT ANSWER cracking due to overheating (low water) or thermal shock What is the maximum size of safety valve permitted on a heating boiler? CORRECT ANSWER 4 1/2 inches What is the function of a boiler vent? CORRECT ANSWER It is used to vent air from the boiler when filling with water or warming the boiler, and to prevent vacuum from forming when taking the boiler offline. What is the function of low water fuel cut-off? CORRECT ANSWER It shuts off the boiler burner in the event of a low water What is the function of the operating pressure control? CORRECT ANSWER An automatic device that controls the starting and stopping of the burner on steam pressure demand. Explain the term "water hammer". CORRECT ANSWER Banging cause by steam and water mixing in a steam line. What is the first thing a boiler operator must do when taking over a shift ? CORRECT ANSWER Check the water level on all boilers that are online/working Name two pressure controls required on a steam heating boiler. CORRECT ANSWER Modulating pressure control, pressure control or ON/OFF conbustion control What determines the frequency of boiler blowdown? CORRECT ANSWER Feed water annalist