Gasfitter - Class B - Exam Information

Self-Assessment
Exam Breakdown
Types of Exam Questions
Math Formulas
Acronyms

Self-Assessment

This tool can be used to reflect on your own experience and knowledge in the trade compared with what is on the exam.

Exam Breakdown

Each Red Seal exam's questions are developed to assess the activities laid out in the Red Seal Occupational Standard. This trade's Red Seal exam has 100 questions^{Footnote *}, which are distributed as follows:

Major Work Activity A - Performs common occupational skills - 7 questions

Task A-1 Performs safety-related functions

2 questions

Task A-2 Uses tools and equipment

2 questions

Task A-3 Organizes work

3 questions

Task A-4 Uses communication and mentoring techniques

0 questions

Major Work Activity B – Installs fuel piping and tubing systems - 14 questions

Task B-5 Selects and installs piping for fuel systems

7 questions

Task B-6 Selects and installs tubing for fuel systems

7 questions

Major Work Activity C - Installs venting and air supply systems - 15 questions

Task C-7 Selects and installs venting systems

6 questions

Task C-8 Selects and installs air supply systems

5 questions

Task C-9 Selects and installs draft control systems

4 questions

Major Work Activity D – Installs controls and electrical systems - 15 questions

Task D-10 Selects and installs combustion control systems

3 questions

Task D-11 Selects and installs flame safeguard systems

4 questions

Task D-12 Selects and installs operating control systems

4 questions

Task D-13 Selects and installs electrical systems

3 questions

Task D-14 Selects and installs automation and instrumentation control systems

1 question

Major Work Activity E - Installs and converts fuel systems, appliances and ancillary equipment - 15 questions

Task E-15 Selects, installs and converts fuel systems, appliances and ancillary equipment

8 questions

Task E-16 Selects and installs propane and natural gas storage, handling and dispensing systems

5 questions

Task E-17 Selects and installs other fuel storage, handling and dispensing systems

2 questions

Major Work Activity F - Tests and commissions fuel systems, appliances and ancillary equipment - 16 questions

Task F-18 Tests fuel delivery systems

7 questions

Task F-19 Commissions fuel systems, appliances and ancillary equipment

9 questions

Major Work Activity G - Services fuel systems, appliances and ancillary equipment - 18 questions

Task G-20 Maintains fuel systems, appliances and ancillary equipment

8 questions

Task G-21 Repairs fuel systems, appliances and ancillary equipment

8 questions

Task G-22 Decommissions fuel systems, appliances and ancillary equipment

2 questions

Types of Exam Questions

All Red Seal exam questions are written in multiple-choice format. A multiple-choice question consists of question followed by four possible responses (A, B, C, D). Every question has exactly one correct answer and three incorrect options. They are not misleading or trick questions, but the incorrect options are not always obvious.

There are three types of questions that you will see on Red Seal Exams:

Knowledge and Recall
Procedural and Application
Critical Thinking

Knowledge and Recall

This type of question tests your ability to recall and understand definitions, facts and principles.

For this trade, between 25 and 35% of questions that are this type.

Example of a Knowledge and Recall Question:

Which sizing table is used to determine the capacities of a CSST system?

Schedule 40 steel pipe tables.
Copper tubing tables for natural gas.
Copper tubing tables for propane gas.
Manufacturer’s sizing tables.

Answer: D

Procedural and Application

This type of question tests your ability to apply your knowledge of procedures to a situation.

For this trade, between 50 and 60% of questions are this type.

Example of a Procedural and Application Question:

How is the manual valve on a propane cylinder opened?

Throttled to control flow of gas.
Fully open when in use.
Adjusted and set when installed.
Adjusted according to vapour pressure in tank.

Answer: B

Critical Thinking

This type of question tests your ability to interpret data, solve problems and arrive at valid conclusions.

For this trade, between 10 and 20% of questions are this type.

Example of a Critical Thinking Question:

An air supply system is being laid out for a power draft-assisted burner firing at 1 200 000 Btuh. How many square inches are required?

86 in²
157 in²
171 in²
180 in²

Answer: B

Try more sample questions for this trade and check out the Exam Preparation Guide. It will give you practical insights on what goes into Red Seal exams, and how you can best prepare yourself to do well.

Math Formulas

Formulas [PDF, 187 KB]

The following formulas used in this trade may be needed to answer some questions on its Red Seal exam. They will also be provided with the exam sitting.

Formulas

Measurement unit abbreviations

°C: degree Celsius
°F: degree Fahrenheit
°K: degree Kelvin
A: ampere
BHP: boiler horsepower
BTU: British thermal unit
Btuh: British thermal units per hour
CFH: cubic feet per hour
CFM: cubic feet per minute
ft.: foot
ft²: square foot
ft³: cubic foot
gal.: imperial gallon
gpm: imperial gallons per minute
hr: hour
in.: inch
in²: square inch
in³: cubic inch
kg: kilogram
kPa: kilopascal
kPaG: kilopascal gauge
kW: kilowatt
L: litre
lb.: pound
lbf: pound - force
m: metre
m²: square metre
m³: cubic metre
min: minute
mm: millimetre
psi: pounds per square inch
psia: pounds per square inch absolute
psig: pounds per square inch gauge
s: second
SCFM: standard cubic feet per minute
SPR: seconds per rotation
t: ton (ice melted over a 24-hour period)
USG: American gallon
USGPM: American gallons per minute
V: volt
VA: volt-ampere
W: watt

Values

∆T: temperature difference
B: base
BarG: bar gauge
C: specific heat of fluid
CO₂: carbon dioxide
D: distance
FCS: fully closed signal
FOS: fully open signal
H: height
HV: heating value
I: current (in amperes)
IS: input signal
L: length
M: mass of fluid per hour
P: pressure
P_base: base/atmospheric pressure
P_test: test pressure
PF: pressure factor
r: radius
R: resistance (in ohms)
SF: safety factor
stoich: stoichiometric
T: temperature
T_amb: ambient temperature
W: width

Constants

π: 3.1416
1 ft³ of water: 6.228 gal.
1 USG: 8.33 lb.
45° offset: 1.414
12 000 BTU (cooling capacity): 1 t
Air- fuel ratio: 14.7
Base/atmospheric pressure: 14.73 psig/psia
Boiler horsepower (BHP): 33 500
BTU per 1 000 W (single phase): 3.414
BTU per 1 000 W (three phase): 1.73
Heat content - natural gas: 1 000 BTU/ft³
Heat content - propane: 2 500 BTU/ft³
Pressure head conversion unit: 0.433 psi/ft.
Specific heat of air: 1.08
Standard for air at sea level: 4.5

Conversion factors

Conversion factors
To convert	To	Multiply by
°C	°F	1.8 and add 32
°C	°K	1 and add 273
decimal	second	60
ft²	in²	144
ft³	USG	7.48
kg	lb.	2.205
kPa	lbf/ft²	20.88
kPa	lbf/in² (psi)	0.1450
kPaG	lbf/in² gauge (psig)	0.1450
L	USG	0.2200
L/min	USGPM	0.2641
L/s	gpm	13.20
m	ft.	3.281
m²	ft²	10.76
m³	ft³	35.31
mm	in.	0.03937

General formulas

General formulas
Descriptions	Full	Abbreviated
% of CO₂	$\frac{stoichiometric {CO}_{2}}{1 + (% of excess air \div 100)}$	$\frac{stoich {CO}_{2}}{1 + (\frac{% excess air}{100})}$
Actuator position (%)	$\frac{input signal - fully closed signal}{fully open signal - fully closed signal}$	$\frac{IS - FCS}{FOS - FCS}$
Btuh	mass of fluid per hour × specific heat of fluid × temperature difference	$M \times C \times Δ T$
CFH	$(\frac{appliance output in Btuh}{appliance efficiency %}) \div heating value$	$\frac{output}{efficiency} \div HV$
CFH	$\frac{appliance output in Btuh}{heating value}$	$\frac{output}{HV}$
CFH	(dial size ÷ seconds per rotation) × seconds in 1 hour × pressure factor	$\frac{dial}{SPR} \times 3 600 \times PF$
CFH	$\frac{seconds in 1 hour \times dial size}{seconds per rotation}$	$\frac{3 600 \times dial}{SPR}$
CFM	$\frac{(British thermal units per hour \times efficiency)}{(specific heat of air \times temperature difference)}$	$\frac{Btuh \times E}{1.08 \times Δ T}$
CO₂ volume (combustion)	appliance output in Btuh × cubic feet of CO₂ per cubic foot of gas ÷ heating value	$output \times {ft}^{3} of {CO}_{2} / {ft}^{3} of gas \div HV$
Fuse rating	amperes × safety factor	$A \times SF$
Gauge pressure reading	$(\frac{(pressure + air-fuel ratio) \times (temperature difference + temperature)}{ambient temperature + temperature}) - air-fuel ratio$	$(\frac{(p + 14.7) \times (△ T + T)}{T_{amb} + T}) - 14.7$
Input (Btuh)	$\frac{appliance output in Btuh}{appliance efficiency %}$	$\frac{output}{efficiency}$
Input (Btuh)	(base pressure + dial size) × cubic feet per hour ÷ base pressure × heating value	$(\frac{[P_{base} + dial] \times CFH}{P_{base}}) \times HV$
Input (Btuh)	cubic feet per hour × heating value	$CFH \times HV$
Input (Btuh)	$(\frac{seconds in 1 hour \times bar gauge}{seconds per rotation}) \times (\frac{base pressure + bar gauge}{base pressure}) \times heating value$	$(\frac{3 600 \times BarG}{SPR}) \times (\frac{P_{base} + BarG}{P_{base}}) \times HV$
Net stack temperature	downstream flue temperature − ambient temperature	$downstream flue T - T_{amb}$
Output (Btuh)	temperature difference × 1 USG × minutes in 1 hour × American gallons per minute	$Δ T \times 8.33 \times 60 \times USGPM$
Output (Btuh)	total number of boiler horsepower × number of boilers	$# BHP \times 33 500 \times # boilers$
Power	volt × ampere	$V \times A$
Pressure factor	(base pressure + bar gauge) ÷ base pressure	$\frac{P_{base} + BarG}{P_{base}}$
Pressure test	$(\frac{[combustion rate \times number of cylinders] + (136.354 \times air-fuel ratio)}{[test pressure \times number of cylinders] + 136.354}) - air-fuel ratio$	$(\frac{[comb. rate \times # cyl.] + (136.354 \times 14.7)}{[P_{test} \times # cyl.] + 136.354}) - 14.7$
Purge time	cubic feet per minute × number of air changes ÷ exhaust fan capacity measured in standard cubic feet per minute	$\frac{CFM \times # air changes}{SCFM}$
Seconds per rotation	$\frac{cubic feet per hour}{(seconds in 1 hour \times pressure factor)} \times dial size$	$\frac{CFH}{(3 600 \times PF)} \times dial$
Travel	offset distance × 45° offset constant	$offset D \times 1.414$
Volt ‑ ampere	current × voltage	$I \times E$
Voltage	current × resistance	$I \times R$

Area formulas

Description	Full	Abbreviated
Circle	π × radius squared	$π r^{2}$
Rectangle	length × width	$L \times W$
Sphere	4 × π × radius squared	$4 π r^{2}$
Triangle	$\frac{base \times height}{2}$	$\frac{B \times H}{2}$

Volume formulas

Volume formulas
Description	Full	Abbreviated
Cuboid	length × width × height	$L \times W \times H$
Cylinder	π × radius squared × height	$π r^{2} H$
Sphere	$\frac{4 \times π \times radius cubed}{3}$	$\frac{4 π r^{3}}{3}$

Acronyms

Acronyms [PDF, 63 KB]

The following acronyms used in this trade may be on its Red Seal exam. They will also be provided with the exam sitting.

ABS: acrylonitrile butadiene styrene
ACR: air conditioning and refrigeration
AFUE: annual fuel utilization efficiency
AHJ: authority having jurisdiction
ANSI: American National Standards Institute
BFS: battery-filling system
CAPS: combustion air proving switch
CEC: Canadian Electrical Code
cfm: cubic feet/minute
CSA: Canadian Standards Association
CSST: corrugated stainless steel tube
DFMAH: direct-fired make-up air heater
DWV: drain, waste, vent
EAC: electronic air cleaner
ECM: electronically commutated motor
EF: electrofusion
FARC: fuel air ratio control
FLA: full load amps
FVS: fuel valve switch
HGPS: high gas pressure switch
HSI: hot surface ignitor
HWA: high water alarm
I.D.: inside diameter
IR: infrared
LGPS: low gas pressure switch
LP: liquid propane
LWA: low water alarm
LWCO: low water cut-off
NBC: National Building Code
NPS: nominal pipe size
O.D.: outside diameter
OHS: Occupational Health and Safety
OHSA: Occupational Health and Safety Act
PB: proportional band
PID: proportional integral derivative
POC: proof of closure
ppm: parts per million
psia: pounds per square inch absolute
psig: pounds per square inch gauge
QNFT: quantitative fit test
spr: seconds per revolution
SSOV: safety shut-off valve
USG: U.S. gallon
USWG: U.S. water gallon
UV: ultraviolet
VAC: Volts/Alternative Current
VDC: Volts/Direct Current
VFD: variable frequency drive
VPS: valve proving system
w.c.: water column
WHMIS: Workplace Hazardous Materials Information System

For more information about exam preparation materials contact your provincial/territorial apprenticeship office.

Gasfitter - Class B - Exam Information

Table of Contents

Knowledge and Recall

Procedural and Application

Critical Thinking

Formulas

Measurement unit abbreviations

Values

Constants

Conversion factors

General formulas

Area formulas

Volume formulas