TQ Gas Flashcards
Which type of burner is commonly used in a domestic hot water tank?
Up-shot
What is the minimum passageway dimensions required to access a gas appliance?
36” x 36”
What is the minimum access opening required to access the space a gas appliance is located within?
24” x 30”
What are the testing requirements for welded gas piping?
(underground gas line, metal riser has one welded joint)
50 psig or 1.5 times the max operating pressure for 3 hours
What is the minimum dimension a pool heater can be located from a property line?
18”
The heat anticipator should be set to match what;
A) Control circuit amperage
B) Manufacturers gas valve amperage
C) Control circuit resistance
D) A or B above
D) A or B above
What is the minimum distance required from a source of ignition in a repair garage?
54”
What is the minimum distance required from a source of ignition in a storage garage?
18”
What percentage must the vent sizing table capacity be reduced when installing a corrugated liner?
A) 10%
B) 15%
C) 20%
D) 25%
C) 20%
Which flame detection method listed below utilizes energy light waves?
A) Intermittent
B) Ionization
C) Ultraviolet
D) Thermoelectric
C) Ultraviolet
What is the minimum dimension required for unthreaded portion of piping penetrating a finished floor?
2”
What is the minimum dimension required for unthreaded portion of piping penetrating a wall or ceiling?
1”
How is a heat anticipator wired in a controlled circuit?
Series
Ideal combustion
Same as perfect combustion, NO EXCESS AIR
CO2, N2, H2O, Heat and Light
Complete combustion
Has excess air
CO2, N2, H2O, O2, Heat and Light
Limits of flammability of natural gas
5% - 15%
Limits of flammability of propane gas
2% - 10%
On a 120 VAC circuit, what is the condition of a closed switch with 3 VAC measured across the switch contacts?
The switch is within acceptable limits (3% max)
Minimum combustable clearance required above a space heater?
36”
What is the COMBUSTION CHAMBER draft tolerance for a balanced draft system?
A) -0.02” to -0.04” wc
B) -0.2” to -0.4” wc
C) 0.02” to 0.04” wc
D) 0.4” to 0.6” wc
D) 0.4” to 0.6” wc
What is the VENT draft tolerance for a balanced draft system?
A) -0.02” to -0.04” wc
B) -0.2” to -0.4” wc
C) 0.02” to 0.04” wc
D) 0.4” to 0.6” wc
A) -0.02” to -0.04” wc
What is the minimum dimension a gas appliance vent can terminate above a paved sidewalk or paved driveway located on a public property?
7 feet
Difference between type BH vent systems and type BW vent systems?
Corrosion resistance
How many hours would a burner firing propane operate with a rated input of 8855 BTU’s if it were connected to a properly filled 30lb cylinder?
A) 32 hours
B) 58 hours
C) 72 hours
D) 84 hours
C) 72 hours
30 lbs x 8.5 CF/lb = 255 CF
255 CF x 2500 BTU/CF = 637,500 BTU
637,500 BTU / 8855 BTU/hr = 72 hours
One ton of refrigeration cooling can be expressed in minutes as what?
200 BTU’s per minute
One ton of refrigeration cooling can be expressed in hours as what?
12,000 BTU’s per hour
One ton of refrigeration cooling can be expressed in days as what?
288,000 BTU’s per day
How many BTU’s of heat energy can be removed from a space if a one ton cooling unit operated for four hours?
48,000 BTU’s
12,000 x 4 = 48,000
With direct reference to a belt driven single speed blower motor on a conventional furnace, how can a technician INCREASE fan speed?
Close the width of the blower motor pulley sheave
With direct reference to a belt driven single speed blower motor on a conventional furnace, how can a technician DECREASE fan speed?
Open the width of the blower motor pulley sheave
Max high limit temperature setting allowed on a conventional forced air furnace?
250 degrees F
Minimum buried depth for type L copper?
15”
Minimum dimensions a DFMHA can be installed from the edge of a roof?
6 feet
How can a gasfitter size an unknown future branch in a gas piping system?
100% (full size) of the pipe immediately downstream of the meter
According to the CEC, what would be the class of a transformer with a secondary output of 24 VAC?
Class 2
Which type of LWCO is acceptable to be installed on a low temperature hydronic boiler?
A) Probe type
B) Float type
C) Flow type
D) A or B above
D) A or B above
Minimum dimension above grade for a combustion air intake into a building?
12” (1 foot)
Minimum size opening allowed for a screen on a combustion air duct opening?
1/4” by 1/4”
Which agency regulates the testing of venting materials for gas fired appliances?
A) CSA
B) ULC
C) CGA
D) ABSA
B) ULC
Minimum pressure scale reading allowed on a test gauge used for low-pressure gas line pressure test?
A) 15 psig
B) 30 psig
C) 45 psig
D) 60 psig
D) 60 psig
Max CO2 measurement that could be achieved during a combustion analysis for natural gas?
12%
Max CO2 measurement that could be achieved during a combustion analysis for propane gas?
14%
From the list below, which component must be installed in the liquid piping when manifolding two propane tanks together?
A) Overflow protection defice
B) Hydrostatic relief valve
C) Vapour relief valve
D) All of the above
B) Hydrostatic relief valve
Minimum distance allowed between a direct fired vaporizer and a property line?
A) 10 feet
B) 25 feet
C) 50 feet
D) 75 feet
B) 25 feet
What should be done with the condensate from a high-efficient category IV furnace?
Neutralized and piped directly to a drain
High-efficient gas appliance condensate water vapour contained in the _______.
A) Flue gases
B) Vent gases
C) Dilution gases
D) Ventilation gases
A) Flue gases
Primary purpose of LED lights on a control module?
Identifies component faults
Minimum distance required between a direct vaporizer and a propane tank?
10 feet
Max number of supports required on a horizontal propane tank?
2 pads or piers
Which type of weld is only permitted on a socket weld fitting or slip on flange?
A) Surface
B) Plug or Slot
C) Fillet
D) Groove
C) Fillet
With regards to permanent propane installations, what is the mandatory requirement for pressure control?
Two stage regulation is required
Unless placed in a permanently fixed manner, which code listed below regulates the installation of gas operated appliances and piping for mobile home installation?
A) CSA B-149.1-20
B) CSA B-149.2-20
C) CSA Z-240.4.2
D) Z-662-15
C) CSA Z-240.4.2
Unless specified by the manufacturer, periodic inspection of pressure relief devises on propane tanks shall not exceed;
A) Two years
B) Five years
C) 10 years
D) 15 years
B) Five years
What method is required to size an excess flow valve on a propane system?
A) In excess of 10% the max anticipated flow rate
B) In excess of 25% the max anticipated flow rate
C) In excess of 50% the max anticipated flow rate
D) In excess of 75% the max anticipated flow rate
C) In excess of 50% the max anticipated flow rate
What is required when installing a gas log in an existing masonry fireplace?
The chimney damper shall be permanently secured in an open position
Where should the water connection from a back flow preventer be made to a hydronic heating system?
Supply line close to boiler
Purpose of the back flow preventer on a boiler system?
Protect drinking water (potable water) from contamination
What is the average vaporization rate of a 100lb propane cylinder?
50,000 BTU’s per hour
How many 100 lb propane cylinders can be connected on a manifold to a propane piping system?
A) 2
B) 3
C) 4
D) 5
C) 4
Acronym for simplified apprentice coaching method?
PTSD (Plan, Tell, Show, Do)
