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Gas 3|223 Final Exam Revision Questions With Expert Answers| Success Guaranteed, Exams of Engineering

Gas 3|223 Final Exam Revision Questions With Expert Answers|2025/2026

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Gas 3|223 Final Exam Revision
Questions With Expert Answers
If the scale on a mechanical drawing is 1/8" - 1'0" then a line measuring
4" in length is actually? - 32 feet
Mechanical drawings are used to? - give the building address,
show the equipment location, piping layout, duct sizing, and duct
layout
The B149.1-05 Code is used to determine - requirements for
installing gas appliances
A "bill of materials" is a - list of all the materials used
manufacturing the equipment.
The word "symptom" is used in manufactures' literature to describe -
Abnormal operation of the equipment
On a roof with a 12/12 pitch and no obstructions, the minimum vent
height for a natural gas fired appliance is - 4 feet
To correct a symptom such as fluctuating flame, a technician should
first - notify the local utility or fuel supplier
Safety directives and bulletins are issued by - Technical
Standards and Safety Authorrity
Equipment wiring diagrams indicate which of the following? -
Supply voltage, internal wiring, location of controls, field wiring
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Gas 3|223 Final Exam Revision

Questions With Expert Answers

If the scale on a mechanical drawing is 1/8" - 1'0" then a line measuring 4" in length is actually? - ✔ ✔ 32 feet

Mechanical drawings are used to? - ✔ ✔ give the building address, show the equipment location, piping layout, duct sizing, and duct layout

The B149.1-05 Code is used to determine - ✔ ✔ requirements for installing gas appliances

A "bill of materials" is a - ✔ ✔ list of all the materials used manufacturing the equipment.

The word "symptom" is used in manufactures' literature to describe - ✔ ✔ Abnormal operation of the equipment

On a roof with a 12/12 pitch and no obstructions, the minimum vent height for a natural gas fired appliance is - ✔ ✔ 4 feet

To correct a symptom such as fluctuating flame, a technician should first - ✔ ✔ notify the local utility or fuel supplier

Safety directives and bulletins are issued by - ✔ ✔ Technical Standards and Safety Authorrity

Equipment wiring diagrams indicate which of the following? - ✔ ✔ Supply voltage, internal wiring, location of controls, field wiring

A broken or dotted line on a manufacturer's wiring diagram normally indicates - ✔ ✔ field installed wiring

Equipment service bulletins are normally issued by the - ✔ ✔ Manufacturer

gas piping regulations are in sections ___________ of the b149.01- code? - ✔ ✔ 6

All furnace appliance manufacturers' literature gives the name of the manufacturer, the - ✔ ✔ Btuh input, fan size, CFM, voltage, fuse size, and the physical dimensions

Pipe fittings in gas piping shall be made of? - ✔ ✔ Steel or Malleable iron

The gas line serving appliances in a recreational vehicle shall be purged of air - ✔ ✔ at the open top burner using a lighted taper

What is the minimum depth a gas line must be buried under the lawn? - ✔ ✔ 15 inch

A manual shut off valve used for natural gas shall be - ✔ ✔ a plug, ball or eccentric type rated for the pressure or temperature to which it will be subjected

Copper tubing used for underground service shall be - ✔ ✔ type K or type L coated, or type G coated

How is a piping system tested after an appliance is connected? - ✔ ✔ At the normal working pressure of the system for 10 minutes

In a circuit the higher the resistance the lower the circuit flows? - ✔ ✔ True

An ampere is a unit for measure of? - ✔ ✔ Electrical current

Transformers that produce a secondary voltage that is higher than the line voltage is called? - ✔ ✔ Step up

When testing a capacitor the first thing a technician should do is? - ✔ ✔ Make sure power is off

Ten horsepower of mechanical power is equal to_____ watts of electrical power? - ✔ ✔ 7500

Transformers that produce a secondary voltage that is lower than the primary voltage is called? - ✔ ✔ Step down

The negative charge in an electric atom is called? - ✔ ✔ Electron

What is potential difference also called? - ✔ ✔ Voltage

What is the kilowatt out put of an electric heater that has 120v supply and draws 30 amps? - ✔ ✔ 3.60 kW

How much does 1 kW equal in BTUs? - ✔ ✔ 3410

The current required to operate 1 kW at 120v is? - ✔ ✔ 8.3 amps

What is the BTUh output of a 10 kW heater? - ✔ ✔ 34,

What organization is responsible for certification of venting material? - ✔ ✔ ULC

What is the provincial ministry that is ultimately responsible for the TSSA act? - ✔ ✔ MCS

Which organization is responsible for auditing gas contractors? - ✔ ✔ TSSA

Registrations of contractors; no person shall act as a contractor unless the _______ is registered for the purpose? - ✔ ✔ Person

What name is given to a vehicular portable structure that is of self propelled designed? - ✔ ✔ Motorized design

Name the device that is used to radiate heat to the surrounding air? - ✔ ✔ Radiant heater

What term is given to a part that is normally closed and allows flow in only one direction? - ✔ ✔ Back check valve

What is a category I appliance? - ✔ ✔ codebook

What type of draft is produced by a device downstream of a combustion zone of an appliance? - ✔ ✔ Induced draft

What is the expression for the maximum pressure to which any component or portion of the fuel system can be subjected? - ✔ ✔ Maximum operating pressure

What term is used to describe the method of replacing the existing fluid (gaseous or liquid) in piping, tubing, equipment, a container or an appliance with a desired fluid. - ✔ ✔ Purging

Which type of pilot burns without turndown throughout the entire time the burner is in service, whether the main burner is firing or not? - ✔ ✔ Continuous pilot

Which of the following is not permitted for natural gas use? - ✔ ✔ Type "M" copper tubing

A 1" diameter, 40' long natural gas plastic pipe with a supply pressure of 7-14" w.c would have a gas carrying capacity of? - ✔ ✔ 422 CFH

The pressure test requirements for a piping system less than 200', up to and including 2 PSIG working pressure is? - ✔ ✔ 15 minutes at 15 PSIG

A joint or connection in steel piping shall be? - ✔ ✔ Threaded, Flanged, Welded

What appendix gives purging times for gas piping? - ✔ ✔ Appendix H

A reading of 7.0" w.c equals - ✔ ✔ 1/4 PSIG

What is the maximum allowable gas supply pressure in a house? - ✔ ✔ 2 PSIG

A branch line used to supply a unit heater in an industrial building is no longer required, the correct procedure for the termination of the line is? - ✔ ✔ With a cap.

To accurately measure the pressure drop in a natural gas piping system you must? - ✔ ✔ measure the inlet and outlet pressure

Working pressure is defined as? - ✔ ✔ The gas pressure in the building line while the appliance is running.

Old, used sch 40 black iron piping may be re-certified by? - ✔ ✔ Technician

The table used to determine the equivalent length for gas pipe fitting is? - ✔ ✔ A.

A hose used to connect the bbq - ✔ ✔ Max 30' length, Approved, Working pressure of 250 PSIG

An infrared heater is used to heat various locations except? - ✔ ✔ Occupied residencies

If a gas technician notices orange flashes in a gas flame it's an indication of? - ✔ ✔ Dust burning in the flame

If the burner for an atmospheric appliance is cold, the flame will tend to? - ✔ ✔ Flash back

In reference to a warm air furnace, Delta T can be attained by? - ✔ ✔ The temperature difference between the supply air and the return air

When heat is transferred through a solid from particle to particle the heat transfer is referred to as? - ✔ ✔ Conduction

What type of venting does a recessed wall furnace use? - ✔ ✔ "BW" Vent

Identify one of the below appliances that does not use air circulating blower? - ✔ ✔ Gravity Warm Air System

Many domestic under fired storage water heaters use what type of temperature control? - ✔ ✔ Rod and Tube sensor

On a combination fan high limit switch the fan-on setting is approximately? - ✔ ✔ 140 F

Where should the nozzle of a fire extinguisher be pointed? - ✔ ✔ At the base of the fire

Which of following lists best describes the key safety categories which should be considered by a fuel technician in Ontario - ✔ ✔ Personal safety, tools, equipment, safety of others, site, OHSA, Ontario Fuel codes

How often do fire extinguishers have to be inspected? - ✔ ✔ every 12 months

Who is responsible for a hazard? - ✔ ✔ The person aware of it

Which fire extinguisher would you use in an electrical fire? - ✔ ✔ Class C

How many fire extinguishers are listed by ULC - ✔ ✔ 5

A foot has ____ inches and a meter has ____ centimeters? - ✔ ✔ 12 Inches, 100 centimeters

How should an electric drill be disconnected? - ✔ ✔ By pulling the plug at the outlet

What type of fastener is used to join two electricala conductors? - ✔ ✔ Marrette, wire nut

Shots for powder activated guns must be stored? - ✔ ✔ in a dry, secure location

What is the area of a rectangular air supply opening measuring 12" x 10" - ✔ ✔ 120 square inches

convert 40 C to Fahrenheit - ✔ ✔ 104 F

To determine the indicated gas pressure on a "simple" or traditional water-filled "U" tube manometer - ✔ ✔ read the amount of water column displaced on the pressure side and add it to the amount displaced on the atmospheric side

Copper wire should be skinned with - ✔ ✔ a wire stripper

A carbide tipped bit is used to drill into - ✔ ✔ concrete

The fastener used to connect a drain hose to a fan coil unit is? - ✔ ✔ Gear Clamp

The relative density of liquid propane is approximately? - ✔ ✔ 0.

How much air is required to burn 1,000 cubic feet of natural gas per hour? - ✔ ✔ 10,000 cu.ft.

The specific gravity of propane is? - ✔ ✔ 1.

Which of the following are characteristics of carbon monoxide? - ✔ ✔ colorless, tasteless, odorless, combustible, lighter than air and extremely toxic

Which of the following is toxic? - ✔ ✔ carbon monoxide

What is natural gas mainly composed of? - ✔ ✔ Carbon and Hydrogen

Which of the following are symptoms of carbon monoxide poisoning? - ✔ ✔ headaches, nausea, dizziness, confusion, rapid heart rate, death

As the temperature of liquid propane in a tank increases, the vapor pressure of the propane does what? - ✔ ✔ Increases

The minimum amount of air required for complete combustion to burn 1 cubic foot (0.028 cu.m.) of propane is approximately? - ✔ ✔ 25. cu.ft

The boiling point of propane at atmospheric pressure is? - ✔ ✔ - F

At 60 F one pound of liquid propane will produce ___ cubic feet of vapor? - ✔ ✔ 8.

If a natural gas flame is adjusted to produce more than 11.9% carbon dioxide what happens? - ✔ ✔ Carbon monoxide may be produced

The ignition temperature of propane is in the range of? - ✔ ✔ 920F- 1020F

Propane cylinders used in Ontario must be manufactured and approved to the requirements established by... - ✔ ✔ Transport Canada

A quick disconnect device is? - ✔ ✔ a hand-operated device which provides for connecting and disconnecting an appliance to the gas supply

When is a certificate required order to install or service a propane appliance? - ✔ ✔ when installing or servicing an appliance in other than one's own residence

A Notice of Proposal to deny an authorization will inform the person of? - ✔ ✔ their right to a hearing with director

When an appliance is installed on a roof, the minimum clearance between the appliance and the edge of the roof shall be? - ✔ ✔ 6 feet

An authorization holder who is not in agreement with the Director's ruling may? - ✔ ✔ Appeal to the Divisional Court

Which expression best describes a control intended to prevent an unsafe condition of temperature, pressure or liquid level? - ✔ ✔ Safety limit control

Every person commits an offense who? - ✔ ✔ Contravenes the Act, Makes a false statement, fails to comply with an authorization

Which type of pilot burns low turndown throughout the entire time the burner is in service, whether or not the main burner is firing, expect that upon a call for heat, the fuel flow to the pilot is automatically increased to produce a flame which will reliably ignite the main burner fuel - ✔ ✔ expanding pilot

In cases of a threat to public safety a Director may make order - ✔ ✔ that contravene the provisions of the act

A steam boiler shall conform to the requirements of which of the following agencies or organizations? - ✔ ✔ The Technical Standards and Safety Authority

A person who is served with an order to comply may? - ✔ ✔ only comply with the order

The holder of a G.1 certificate is permitted to work on? - ✔ ✔ appliances with any input in vapor phase

A person might be refused authorization to perform any duties under the Act where - ✔ ✔ the person is not qualified

A director's safety order must be - ✔ ✔ in writing

If an Inspector under the TSSA issues an order, or if a Director under the TSSA refuses to renew a license, registration or certificate, there is no means of appealing or changing the order or decision. - ✔ ✔ False

During an inspection, every person shall - ✔ ✔ assist the inspector and produce anything where necessary

By covering a piece of wood with 1/4" of insulating millboard and 28 gauge sheet metal, a person may reduce the side clearance of an appliance that requires 6 inches clearance from combustible material - ✔ ✔ By 4 inches

Where the Divisional Court hears an appeal of a Director's ruling, the courts decision is? - ✔ ✔ Final

What is the expression for a housekeeping unit, used or intended to be used by persons for whom sleeping accommodation is provided but who are not harbored or detained to receive medical care or are not involuntarily detained: - ✔ ✔ residential building

A damper is a: - ✔ ✔ Plate or valve for regulating the flow of air or flue gases

The voltage reading across an open switch of an energized (12V) circuit should be? - ✔ ✔ Applied Voltage

Resistance in a circuit is measured by using a? - ✔ ✔ Ohm meter

When the circuit flows in one direction while maintaining a constant voltage is called? - ✔ ✔ Direct Voltage

One horsepower of mechanical power is equal to _______ watts of electrical power? - ✔ ✔ 750

The number of conductors in a number 14/2 gauge wire is? - ✔ ✔ 2

Transformers that share a winding or portion of winding are called? - ✔ ✔ Auto transformer

The two most important ratings of a capacitor are? - ✔ ✔ Volts and Microfarads

Voltage meters are read in ____ with the load? - ✔ ✔ Parallel

Operating controls govern the operation of an electrical load and are always shown in ______ position? - ✔ ✔ Normally Open

One watt is equal how many BTU's? - ✔ ✔ 3.

On a 120v receptacle the hotline connection are? - ✔ ✔ Gold

What is the amount of amperage that could kill a person? - ✔ ✔ Lowest amount

An electron has a ____ charge. - ✔ ✔ Negative

In line amp meters are always read in ____ with a load - ✔ ✔ Series

On a 120v receptacle the neutral line connection terminals are? - ✔ ✔ Silver

The total capacitance of a series circuit that contains of a 5 mf and 10 mf? - ✔ ✔ 3.

Total capacitance in parallel circuit that contains of 10 ohms load and a 5 ohms load is? - ✔ ✔ 15

Safety controls are always found in the ____ position? - ✔ ✔ Closed

Transformers which produce a secondary voltage which is lower than the primary are said to be: - ✔ ✔ step down transformer

As the current increases in a conductor the magnetic field around the conductor - ✔ ✔ Increases

What is the kilowatt output of an electric heater that has a 240 volt supply and draws 50 amps - ✔ ✔ 12,

Which meter is used to check for potential - ✔ ✔ Volt meter

With the fuse removed from the circuit, the resistance reading across a blown fuse would be? - ✔ ✔ Infinity

The equivalent resistance of two 10 Ohm resistors connected in parallel is - ✔ ✔ 5.

Which of the following wires rated for highest current? - ✔ ✔ # AWG

Which of the following statements concerning electrical conductors is correct? - ✔ ✔ A junction box connector approved for the box and wire type must be used

If voltage is constant in a resistive circuit when current increases, resistance - ✔ ✔ decreases

The branch electrical circuit to a heating appliance may be used to supply power to - ✔ ✔ accessories necessary for the safe operation of the appliance

The voltage reading across an open switch of an energized electrical circuit should be - ✔ ✔ the applied voltage

Which of the following statements concerning ammeters is correct - ✔ ✔ an in-line ammeter must be connected in series with the load

When checking to determine an unknown supply voltage with an analog meter having ranges of 0-30 volts, 0-250 volts, 0-600 volts, and 0-1000 volts which range should be selected? - ✔ ✔ 0-1000v

Which statement is correct? - ✔ ✔ The series-parallel circuit is the most common type of circuit used in gas appliances.

If resistance is constant in a resistive circuit and there is a voltage surge the current: - ✔ ✔ Increases

Electrical wires shall be supported - ✔ ✔ every 5 feet

Which statement is correct concerning a parallel circuit? - ✔ ✔ The total resistance of the circuit will be less than the smallest resistance in the circuit

Equipment specifications indicate mainly: - ✔ ✔ dimensions required to install the appliance, weight of the equipment, electrical characteristics, size and location of the vent outlet, piping inlet size, model number

Steel piping used in gas installations shall comply with - ✔ ✔ ASTM A53 or ASTM A

What is the maximum allowable length of corrugated flexible connector when it is used to connect a suspended appliance to piping or tubing? - ✔ ✔ 6 feet