Quiz - Valves/Ancillary Equipment Flashcards
How does a thermocouple work?
a) detects flame through AC voltage flow?
b) detects flame through optical reading
c) detects flame through ultraviolet light reading
d) detects flame through production of millivoltage
d)
A flame rectification system works through the use of?
a) optical flame direct current reading
b) UV light rectified current reading
c) removing one half of the AC cycle
d) Removing one half of the DC cycle
c)
What is the definition of intermittent pilot?
a) is only on during get run time of the burner
b) comes on intermittent during the run cycle of the burner
c) is on continuously but then turns off once the burner is lit
d) comes on to light the burner but then goes out
a)
What is the main function of the pilot?
a) heat the thermocouple
b) light the burner
c) create millivoltage
d) prove the burner is working properly
b)
What is a flame safeguard?
a) controls the start up of burner
b) monitors the burner
c) shuts down burner in case of flame failure
d) all of the above
d)
The appliance you are working on has a flame safeguard control that is no longer working and you are required to replace it. What is an option in this situation?
a) replace with any flame safeguard from the manufacturer
b) replace with a generic flame safeguard
c) replace with a flame safe guard from the same manufacturer utilizing a different sequence of events
d) replace with a flame safeguard from a different manufacturer utilizing a similar sequence of events
d)
What type of pilot is used for redundant gas valve?
a) expanding
b) interrupted
c) intermittent
d) aerated
c)
On a redundant gas valve what would occur if the pilot valve failed to close the call for heat was satisfied?
a) the main flame remains burning
b) the pilot flame remains burning
c) both flames remain burning
d) both flames are extinguished
b)
A combination servo gas valve will regulate pressure to?
a) the main burner
b) the pilot burner
c) both burners
d) neither burner
a)
What is the opening and closing force of a diaphragm gas valve?
a) an electromagnet
b) a solenoid
c) the thermostat
d) the gas pressure
d)
What will result if the bleed port on a diaphragm gas valve is complete blocked on a call for heat?
a) the valve will go into a hunting condition
b) the valve will not open
c) the armature will not move
d) gas will bleed to the pilot
b)
What will result on a diaphragm gas valve when a call for heat is satisfied?
a) electromagnet will pull the armature to the vent port
b) the electromagnet will pull the armature to the pressure port
c) the return spring will pull armature to the vent port
d) the return spring will pull the armature to the pressure port
c))
What voltage is NOT sufficient to operate a solenoid valve?
a) 250mv
b) 24v
c) 110v
d) 120v
a)
A solenoid gas valve installed with a manual opening device is?
a) prohibited
b) required with propane
c) must be labelled
d) recommended by code
a)
A 100% safe gas valve train valve will:
a) be installed after the automatic gas valve
b) shut off main gas only
c) insure both pilot and main gas shutoff
d) shut off pilot gas only
c)
