G2 Gas Technician Module 12 Questions And Revised Correct Answers PASSED!!
G2 Gas Technician Module 12 Questions And Revised Correct Answers PASSED!! In series with gas valve.,What does a water flow switch do? - ANSWER : Automatic safety control (normally open). Senses water flow and switch closes What does a Pressure Control Switch (pressuretrol) do in a steam boiler? - ANSWER : Automatic control that senses high and low steam pressure in a boiler. It closes to start burner on low pressure and opens at high temperature to stop the burner. Controls steam pressure in the boiler. What does a high pressure control do in a steam boiler and at what psi does it open? - ANSWER : Automatic safety control that is normally closed. It senses high pressure in the steam boiler and opens the switch. This is at 15 psi when it opens. How does a Thermocouple work? - ANSWER : Two dissimilar metals that are joined at two junctions. Heating one of the junctions produces a DC voltage. The temp difference between the hot and cold metals determines the quantity of the DC voltage. sufficient to hold a solenoid like a pilot stat energized.,How much voltage will a thermocouple produce? - ANSWER : It produces 25 - 30 millivolts
Información del documento
- Subido en
- 17 de mayo de 2024
- Número de páginas
- 12
- Escrito en
- 2023/2024
- Tipo
- Examen
- Contiene
- Preguntas y respuestas
