Chapter 5 Flashcards
Quiz 5
Furnace explosions can best be avoided by:
purging the furnace after any flame interruption
A solenoid valve is a direct-acting valve in the gas system and is used:
as an automatic gas shut-off valve
Contaminated oxygen is not required for the combustion of fuel.
True
Soot build-up on heating surfaces
both increases the amount of fuel and blocks heat transfer
What are the three types of draft used in power plants?
natural, forced, and induced
All of the following could be used to control a fan’s output
adjusting the inlet dampers
increasing or decreasing the fan speed adjusting the pitch of the fan blades
Soot is an insulator and it blocks heat transfer
True
A(n) ________ draft fan is located after the furnace.
Induced
All of the following prevent explosions in a boiler room?
The BMS System
The purge Cycle during the sequence of operation
Testing the low-water cut-off
Air is forced into the burner via the draft fan and draft fan motor, what type of draft is this?
Forced Draft
One therm of natural gas equals how many Btu?
100,000
Induced draft means that there is a fan on the back end of the system (by the chimney).
True
When a boiler has an unsafe level of water, what device is electronically activated?
Fuel solenoid valve- which shuts off the fuel supply
What is the Btu content of natural gas?
100,000 Btu/therm
If the boiler continues to run after testing the LWCO, the operator shall stop the boiler.
True
