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G3 module 398 Questions|Test Quiz
Questions With Correct Solutions
- What are the three areas in the venting system to check before reactivation? - ✔ vents exterior venting system interior venting system
- What else must be checked before reactivation? - ✔ combustion and ventilation air openings combustion chamber testing and purging gas supply
- How long must the gas pressure be indicated on the manometer (or pressure testing gauge)? - ✔ 10 minutes
- What procedure must be performed on the control valves and piping before light up? - ✔ soap test
- What must be checked after the appliance has been reactivated? - ✔ manifold gas pressure main flame venting action flue products
- Why should the gas meter be turned on slowly when reactivating a system? - ✔ if the meter is turned on too fast the regulator does not
have time to react. This can cause over-pressure damage to the meter diaphragms, regulator valve seat, and gas controls downstream
- Why is it necessary to makE sure there are no open lines when activating a system? - ✔ to prevent an explosion
- How can you tell if a gas line is open in the system upon system activation? Natural Gas - ✔ the dial hand of the meter will begin rotating when the service valve is turned on
- How can you tell if a gas line is open in the system upon system activation? Propane Gas - ✔ the regulator will begin to feed, and if flow is substantial, a hissing sound will be heard
- Explain the purpose of a meter "dial test". - ✔ to test for leaks in the system up to the inlets of the gas controls
- Why is it important to examine the chimney or vent stack when visiting a premise to work on gas equipment? - ✔ the most common cause of CO poisoning is due to venting system problems
- What should be used as a reference when relighting an appliance? - ✔ the lighting instructions on the appliance rating plate
- What is indicated if the interior of a draft diverter is coated with black powder? - ✔ the burner either needs adjustment or cleaning
- What will result if layers of rust flakes build up inside the top section of a heat exchanger?Early stages: - ✔ incomplete combustion and CO production
- List the gases that sewer gas may be composed of. - ✔ methane, gasoline vapour, illuminating gas, hydrogen sulphide, carbon monoxide, acetylene, hydrogen, ammonia, oxygen, nitrogen
- List four common fuels found in the industrial environment. - ✔ gasoline, diesel, propane, natural gas
- How is propane normally shipped and stored? - ✔ as a liquid under pressure a) A Gas Technician must follow proper handling, storage, and use of hazardous materials. If no job-site information is available, contact the _______ - ✔ Construction Safety Association. b) Solvents are liquids which ___ other substances. Entrance of a hazardous solvent to your body may occur through .... - ✔ dissolve inhalation, skin contact or ingestion. Gas Technicians required to work removing asbestos are required to successfully complete a certified _______ _______ course. - ✔ asbestos abatement
- Hazardous materials are referred to in WHMIS regulations as ___________ - ✔ controlled substances.
- What factors must be considered by the gas technician when dealing with personal safety? - ✔ attitude, posture, clothing, protective equipment
- What personal protective equipment is always mandatory when working in the gas industry? - ✔ safety footwear
- What should be worn when working in an area where welding is being done? - ✔ proper flash goggles
- How do moderate noise levels affect the hearing over long periods of time? - ✔ they can reduce your ability to hear certain types of sounds
- How do moderate noise levels affect the hearing over long periods of time? - ✔ they can reduce your ability to hear certain types of sounds
- List the parts of the body that suffer 30% of all work- related injures.
- ✔ fingers, hands, and arms
- Define a confined space. - ✔ work area where entry and exit are restricted by location, design or construction, and where equipment operations or atmospheres may pose hazards to health and safety
- What are the main atmospheric hazards? - ✔ combustible or explosive gases and vapours, too much or too little oxygen, and toxic fumes
- Name two items that are considered group safety equipment? - ✔ fire extinguishers, first aid kits
- List three types of ventilation systems used in the workplace. - ✔ vacuum systems, exhaust systems, special ventilating equipment
- Where should oily waste and rags be collected? - ✔ in designated covered containers
- What should be done before adjusting or cleaning a power tool? - ✔ it must be stopped and disconnected from its power source
- List four ways an electrical source can cause a fire in the workplace. - ✔ motors burning, broken electrical wiring, light bulbs in contact with fine dust or oily surfaces, unprotected bulbs, and unshielded switches in dusty areas.
- List the four main classes fires are divided into. - ✔ A, B, C, and D
- A gasoline fire belongs to what class? - ✔ Class B
- What class of fire would be fought using a water extinguisher? - ✔ Class A
- How are fire extinguishers identified for use? - ✔ the fire designation rating code for each extinguisher can be found on the name plate
- In the gas industry what are the three main types of material that are fastened to or from? - ✔ wood, concrete, steel
- Why must expansion or vibration be taken into consideration when fastening or supporting equipment? - ✔ to ensure the equipment remains in place
- How should screws be stored? - ✔ in a clean, dry environment
- What may be required to be done before a large lag screw is fastened to a wooden member? - ✔ a pilot hole may have to be drilled
- What are the two common thread patterns found on bolts used by the gas technician? - ✔ National Coarse and National Fine
- What is used in place of bolts when a large amount of adjustment is required? - ✔ all threaded (ready) rod
- Which type of bolt can be used when fastening to hollow block walls?
- List three common configurations of pipe hangers. - ✔ clevis, adjustable steel ring, adjustable swivel ring
- Which type of support is commonly used by the gas technician to install vertical piping? - ✔ riser clamp
- List three types of solderless electrical fasteners. - ✔ twist-on caps, mechanical, eye, spade, splicing sleeve (any three) a) Lag bolts are not actually bolts. They are heavy ______ used to fasten __________ to wooden members. - ✔ screws brackets b) Usually the length of a bolt is measured from ________ the head to the end. - ✔ underneath c) A bolt with a _______ head is measured overall. - ✔ countersunk d) Inset anchors and lead and plastic shields are also known as ____ plugs. - ✔ rawl e) The most common bolt thread used in the gas industry is ____ - ✔ National Coarse NC. f) When the use of a manufactured bolt is difficult because of limited adjustment parameters, threaded or _______ can be cut to the required length. - ✔ ready rod
- Which type of reamer can be used for both hand and power reaming? - ✔ the straight, fluted, ratchet reamer
- Which pipe sizes use a thread pattern of 11.5 threads per inch? - ✔ sizes NPS 1, and NPS 2
- What is the purpose of thread cutting oil? - ✔ it is used to reduce friction, cool the tool and pipe, and flush away metal chips
- Which type of pipe threading die head does not have to be reversed after the thread has been cut? - ✔ the quick-opening die
- Why are electric power tools equipped with three-prong electrical plugs? - ✔ the third prong is the ground, which protects the user from electrical shock should there be a short circuit or if the insulation fails
- Which type of power tool is used to insert fasteners into concrete or steel? - ✔ one which is powder-actuated
- Where should the operator stand when firing a powder- actuated tool? - ✔ behind it
- List two common voltages used to power portable electric drills. - ✔ 110 Volt (AC), 12 Volt (DC)
- Which type of electric drill is designed for drilling into concrete? - ✔ the rotary hammer drill
- Which tool can be used to give a drill bit a start and to keep it from wandering? - ✔ a centre punch
- What should be done before inserting or removing drill bits from the chuck of a power drill? - ✔ the power cord should be disconnected
- Which type of blade is used with the chop saw to cut steel pipe or rod? - ✔ an abrasive type
- How are blades used in reciprocating saws identified for use? - ✔ they are colour coded according to their use
- Name two common types of stationary grinders. - ✔ bench and pedestal
- Which type of grinder is commonly used to grind bevels and clean weld spatters off pipes? - ✔ the portable angle grinder
- Is a powder-actuated tool that uses the captive piston principle considered a high-velocity or low-velocity tool? - ✔ 12. Is a powder- actuated tool that uses the captive piston principle considered a high- velocity or low-velocity tool?
- Electric power tools are (generally) equipped with a three-pronged grounding plug. This protects the tool user from receiving a shock from a _______ or a wiring breakdown. - ✔ short circuit
- Power tools should not be operated in a gaseous or __________ atmosphere. - ✔ explosive
- Power tools should not be operated when standing on a _____ surface. - ✔ wet
- True or False? Powder-activated tools require one to take a course of instruction designed by the manufacturer before being qualified to operate the tool. - ✔ true
steel-toothed abrasive. To cut thermoplastics use a/an ________ blade. - ✔ steel toothed
- The sharp edge left by an electric saw cut is referred as the ____. - ✔ burr rue or False? A power grinder may be used to:
make smooth polished surface make cutting edges on tools used for cutting. cut metal to a desired shape and size - ✔ true
- For drilling through joists or studding, or in tight corners the ______ drive electric drill is used. - ✔ right angle
- When undertaking a "cutting" operation with an electric saw _____ lubricants are used to reduce friction between the cutting blade and the material being cut. - ✔ anti- welding Cartridge type and powder load for powder-actuated tools are distinguished by the metal of the enclosure case and a specific colour coding for the cartridge type and powder load, respectively.
Low-velocity cartridges are in _____ cases. Higher velocity cartridges are in ______ cases.
The weakest charge is colour-coded ___ , the strongest is colour-coded _____. - ✔ brass nickel grey, purp
- Which type of measuring device is most often used by the gas technician? - ✔ the pocket or spring-loaded type
- Which type of square has an adjustable head? - ✔ the combination square
- What is a drill gauge used for? - ✔ it is used to measure drill sizes
- What is the purpose of flue gas analysis? - ✔ safety (check for toxic gases) and efficiency of operation
- List three types of flue gas analyzers. - ✔ tube, liquid, and continuous type
- How many different gases is each detector tube designed to test for?
- What is the advantage of using a liquid type flue gas analyzer compared to the tube type? - ✔ liquid types can be used to take many samples without changing the chemicals, tubes are normally used only once.
- Which type of flue gas analyzer allows you to adjust the burner while watching the results on a monitor? - ✔ the continuous sampling type
- Which type of liquid manometer does the gas technician normally use? - ✔ the water column manometer
Propane : 2520 Btu/ft
- What are the limits of flammability for natural gas and propane? - ✔ Natural gas : 4 - 15% Propane : 2.2 - 9.5% % contained in natural gas Oxygen butane ethane carbon dioxide methane propane nitrogen - ✔ Oxygen .1% butane .81% ethane 6.8% carbon dioxide .14% methane 87.4% propane 1.55% nitrogen3.2% ____ gas is natural gas containing propane, butane, pentane, and other heavy hydrocarbons. - ✔ wet
____ gas produced a common ingredient used in rubber products, carbon black. - ✔ sour Natural gas with all the heavier hydrocarbons removed is also called ____ gas. - ✔ dry The accepted chemical composition for natural gas is ____. Propane is ___.
. - ✔ CH C3H Air has specific gravity of 1.0. Vaporized propane's specific gravity is ____ or ___ For natural gas it is - ✔ 1.52 or 1. 0. At atmospheric pressure, propane has a boiling point of ______ For natural gas, the boiling point occurs at _______ - ✔ -44°F (-42°C). -258°F (-161°C). The specific gravity of liquid propane is - ✔ 0.. At atmospheric pressure, propane gas expands at the ratio of ___ when changing from a liquid to a gas. - ✔ 270: The expansion ratio of natural gas from a liquid to a gas is - ✔ 600:1. Flame Speed (inches/s) NG - ✔ 12 Limits of Flammability (%) NG - ✔ 4- Max. Flame Temperature (°F)NG - ✔ 3550
- What is the term used to describe the air that is mixed with fuel gas before the point of ignition? - ✔ primary air
- What is the purpose of dilution air? - ✔ to cool the hot vent gases to control the draft influence on the combustion chamber
- What is the air-to-gas ratio that applies to all fuel gases? - ✔ each (1000 Btu of fuel input) x 10 ft3 air = perfect combustion
- What is the normal percentage of combustion air to excess air requirements for an atmospheric burner? - ✔ the volume of excess air equal to 50% of combustion air requirements is considered acceptable
- What are the total air volume supply requirements for an atmospheric burner? - ✔ 30 ft3 of air for each 1000 Btu of input
- List four possible causes of incomplete combustion, other than lack of air. - ✔ flame quenching cracked heat exchanger blocked venting negative air pressure
- What are the three colour zones of a stable Bunsen flame? - ✔ inner cone, outer cone, outer mantle
- The Combustion Triangle's elements are , , and. - ✔ fuel, heat and oxygen The mathematically exact volume of air that must be mixed with a fuel gas to achieve perfect combustion.
A)Stoichiometric combustion B)complete combustion C)incomplete combustion - ✔ A All fuel is completely burned and no harmful products of incomplete combustion are produced. A)Stoichiometric combustion B)complete combustion C)incomplete combustion - ✔ B Unburned fuel will contain carbon, hydrogen carbon monoxide and complex chains of alcohol (aldehydes) A)Stoichiometric combustion B)complete combustion C)incomplete combustion - ✔ C Excessive cold air is chilling the flame front... cause? - ✔ flame Excessive air being exhausted from building... cause? - ✔ negative pressure Flame characteristics change as soon as the blower comes on... cause? - ✔ cracked heat exchanger Impingement on the cold metal surface of the heat exchanger... cause?
