Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
4 Cards in this Set
- Front
- Back
|
Thermocouples are connected in series to: 1) Generate a higher voltage 2) Increase the sensitivity of the detection system 3) Monitor more than one flame source 4) Generate a lower voltage 5) Provide a spare thermocouple in case of failure of one |
Generate a higher voltage |
|
|
Flame rods: 1) Should be cleaned of deposits regularly 2) Require frequent filing of electrical contacts to prevent corrosion build-up and failure of the device 3) Should not be exposed to temperatures above 100ºC 4) Should shut off the fuel within four seconds of flame failure 5) Are very reliable and maintenance free |
Should shut off the fuel within four seconds of flame failure |
|
|
A flame rod: 1) Forms an electric circuit with the rod, flame and burner 2) Is used for gas and oil fired burners 3) Forms an electric circuit with the rod, flame and relay 4) Senses the temperature of the flame 5) Is used to light the main burner |
Forms an electric circuit with the rod, flame and burner |
|
|
During the start-up, a boiler equipped with an automatic control system and a flame, scanning device, the main fuel supply valve: 1) Must be closed before ignition 2) Should be opened as soon as the pilot valve opens 3) Must be opened before ignition can take place 4) Can be opened before the flame scanner sees a flame 5) Can be opened any time during start-up sequence |
Must be closed before ignition |
