Chapter 18 Boiler Combustion Controls Flashcards
1
Q
What is the voltage level generated by a thermocouple?
a) 30 millivolts
b) 15 millivolts
c) 60 millivolts
d) 100 millivolts
A
a) 30 millivolts
2
Q
What is the maximum allowable water temperature in a hot water boiler?
a) 200 C (392 F)
b) 75 C (167 F)
c) 150 C (302 F)
d) 120 C (248 F)
A
d) 120 C (248 F)
3
Q
What is the maximum time allowed for a gas valve to close following a flame failure on a gas burner with an electronic flame scanner?
a) 5 seconds
b) 2 seconds
c) 4 seconds
d) 10 seconds
A
c) 4 seconds
4
Q
The time taken for the automatic pilot valve to close in the event of a loss of flame detection is about
a) 5 seconds
b) 10 seconds
c) 15 seconds
d) 22 seconds
A
b) 10 seconds
