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g3 128 quiz Revision Questions With
Solutions
the high limit swith circuitry of a residential appliance is wired in series with the? a) fan motor b)thermostate c)fan switch d)gas valve - ๐ โ d) on a gas meter if the 1/4 dial has moved on a pressure test this would indicate a)malfunction on gas meter b)static pressure oer 14"WC c)the piping not gas tight d) woking pressure below 7" wc - ๐ โ c) all liquid withdrawal propane cylinder service valves must be equipped with? a)manual shut off valve b)back check valve c)internal excess flow valve d)quick action shut off valve - ๐ โ c)
gasket material used on gas or propane system shall be a)natural rubber b)silicone c)polypropylene d)neoprene - ๐ โ d) how tight should a thermocouple connection be a)finger tight b)1/4 turn past finger tight c)11/2 turn past finger tight d)one turn past finger tight - ๐ โ b) on a 120 volt circuit the voltage to ground from an unbroken neutral wire should be a)120 volt b)0 volt c)110 volt d)24 volt - ๐ โ b) on a 120 volt circuit the voltage check on an open switch would be a)120 volt b)0 volt c)110 volt
c)class 3 d)all above - ๐ โ a) what are transformers which produce a secondary voltage which is lower than the primary called a)step down transformers b)step up transformers c)auto transformers d)neutral transformers - ๐ โ a) what is the millivolt (open test) out put of a thermocouple a)10 to 15 b)20 to 25 c)25 to 35 d)25 to 30 - ๐ โ b) can a G3 certificate holder, under direct supervision, install gas piping to a 450 cfg boiler a) yes b) no - ๐ โ a) what cools flue gases a)primary air b)blower fan
c) draft device d)excess air - ๐ โ c) what is the ignition temperature of natural gas a) 1020 F b) 1000 F c)1200 F d)900 F - ๐ โ c) what is the flame termperature of natural gas a)1000 F B)2025F C)3500 F D)3600 F - ๐ โ c) what is the air to gas ratio for propane a) 23to 1 b)10.5 to 1 c)1 to 10 d) 32.5 to 1 - ๐ โ a) what is the expansion rate of propane a) 600 to 1 b)270 to 1
b) mandatory safety data sheet c) material safety data sheet d)material safety daily sheet - ๐ โ c) for self protection you would need a) hard hat, gloves, glasses b)glasses, boots, respiratory c)respiratory, gloves, hard hat d) all the above - ๐ โ d) a ladder must extend above roof landing by a) 30" b)36" c)38" d)24" - ๐ โ b) what is the explosion limit of natural gas a)0.4% to 0.14% b)10% to 1% c)3% to 15% d)4% to 14% - ๐ โ d) who s the testing agency that certifies venting a) CGA
B) TSSA
C)ULC
D) CSA - ๐ โ C)
what is the relief pressure of a propane tank a) 250 psig b)275 psig c)350 psig d)375 psig - ๐ โ d) who issues gas technician certificates in Ontario a) Ontario code regulation permits b)T.S.A certification gas codes c)C.S.A regulation and certification d)technical standard safety authority - ๐ โ d) what is the flammability range of CO a)4% to 14% b)2.5 % to 5.5% c)12% to 74% d)23.5% to 10% - ๐ โ c) what are the products of complete combustion a) carbon dioxide, nitrogen, soot, heat
b)0. c)1. d)0.06 - ๐ โ c) what is the air comprised of a)20% nitrogen 8% oxygen b)80% nitrogen 20% oxygen c) 80% oxygen 20% nitrogen d) 80 hydrocarbon 20% excess air - ๐ โ b) what are the products of incomplete combustion a)carbon dioxide, water, soot, heat b)carbon monoxide, soot, water, air c)soot, aldehydes, carbon monoxide, heat d)aldehydes, carbon monoxide, soot - ๐ โ b) what type of air is premixed with gas prior to ignition a)excess air b) primary air c) combustion air d)dilution air - ๐ โ b) what type of air surrounds the flame for combustion a)venting air
b)post secondary air c)secondary air d)outside air - ๐ โ c) dilution air is a) air to cool hot flue gases b) air to needed for excess air c) air to start combustion d) air to ensure flame - ๐ โ a) how many symbols or classes of fire extinguishers exist? a)two b)three c) ABC d)four - ๐ โ d) if you had 60 watt light bulb at 120 volts what would be the resistance a) 310 b) c) d)265 - ๐ โ c) what is the weight of one gallon of propane a)1.
a)22. b)20. c)18. d)18.46 - ๐ โ c) if the parallel circuit had 23 amps with the same resistance, what will be the voltage a)110.00 volts b)115.25 volts c)122.60 volts d)125.35 volts - ๐ โ d) if you had 60 watts light bulb at 120 volts what would be the amperage a). b)0. c)0. d)0.10 - ๐ โ b) what is the chemical composition of natural gas a) CCH B)C4H C)CH D)CH4 - ๐ โ D)
when it has been determined that the voltage to a unit is approximately 115 volts, which range should an analog volt meter be set at a)0-30v b)0-250v c)0-600v d)0-1000v - ๐ โ b) on a 120 volt receptacle, the neutral connection terminals are a)black b)gold c)silver d)green - ๐ โ c) what is the most common fire extinguishers used in the work place? a)ABD b)BCD c)CBA d)ABC - ๐ โ d) one horsepower equals _____ watts a) b) c)
b)oxygen c)hydrocarbons d)inorganic compounds - ๐ โ c) what does a heat anticipator do a) determines the length of the burner "on" cycle b)acts as a high limit backup c)shuts the Bruner down on over temperature d)shuts the burner down if oil flow is lost - ๐ โ a) a volt is a unit of measure of a)the quantity of electrons 'flow b)the amount of electrical pressure c)how much a circuit will limit current flow d)the amount of power used by a circuit - ๐ โ a) which of the following is an operating control a)air proving switch b)low water cut-off c)thermostat d)pressure relief valve - ๐ โ c) what are ohms used to measure a)the quantity of electrons flowing in a circuit
b)the amount of electrical pressure across a circuit c)the amount of opposition to current flow in a circuit d)the amount or power used by a circuit - ๐ โ c) what are materials that DO NOT readily produces free electrons called a)insulators b)conductors c) grounds d)ions - ๐ โ a) what is potential measured in a)volts b)amps c)ohms d)watts - ๐ โ a) what is electromotive force another expression for a)voltage b)current c)resistance d)power - ๐ โ a) a broken or dotted line on a manufacturer's wiring diagram normally indicates:
pressure testing gas pipe 2 1/2 inches by 300 feet long at what Psig? a) 60 psig b)15 psig c)25 psig d) 50 psig - ๐ โ d) can a decorative appliance be installed in a bedroom a)yes b)no - ๐ โ a) what is the minus pipe diameter for underground installation a)3/ b)1/ c)5/ d)3/4 - ๐ โ b) can 3/8' schedule 40 fittings be used on natural gas systems? (clause 6.3.8.1- must be schedule 80) a) yes b) no - ๐ โ b) what is the maximum spacing for supporting a 1 inch steel gas pipe a)6ft b)10 ft
c)8 ft d)4 ft - ๐ โ d) for a natural gas hose what is the maximum length for a portable appliance (clause 6.20.3b) a)10 ft b)25 ft c)50 ft d)30 ft - ๐ โ d) can an infrared heater be installed in a house a) ye s b) no - ๐ โ b) can carbon dioxide be used to purge gas piping or tubing system a) yes b) no - ๐ โ b) can a malleable iron bushing be used to reduce one pipe size? (clause 6.9.10) a) yes b) no - ๐ โ b) if you install a 2 inch diameter nipple for a dirt pocket what would be the minimum depth? a) 3 1/2"
