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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
