G-3 Exam Questions and Answers Graded A

G-3 Exam Questions and Answers Graded A The term "Symptom" is used in manufacturer's literature to describe: Abnormal operation of the equipment Venting and Air Supply requirements are under section: 8 Equipment wiring diagrams indicate which of the following: Supply Voltage, Internal Wiring, Location of Controls, Field Wiring All furnace appliance manufacturer's literature give the name of the manufacturer, the : Btuh input, fan size, CFM, voltage, fuse size, and the physical dimensions Gas piping requirements fall under which section: 6 On a roof with a 10/12 pitch and a wall 4 feet high and 6 feet away from the vent opening, what is the minimum vent height for a category one propane fired appliance: 6ft The B149.1 Code is used to determine: The requirements for installing gas appliances To correct a symptom such as a fluctuating flame, a technician should first: Consult the Manufacturer's instructions Propane piping in all industrial buildings shall be identified as: Painted or banded in yellow paint or tape / marked or labelled "PROPANE" For residential Natural Gas piping systems of 200 feet or less, and having a working pressure less than 2 psig, the piping or tubing shall be pressure tested using either air or an inert gas for : 10 minutes How is the longest equivalent length determined for systems operating over 2 psig: Add the equivalent length in feet of straight pipe for each fitting, bend or valve to the longest run of pipe Which of the following statements is correct: All shut off valves installed outdoors must be of the plug, ball or eccentric type For residential Natural Gas piping systems of 100 feet or less, with a working pressure less than 2 psig, the piping or tubing system shall be pressure tested using air or inert gas at: 15 psig A Manual Shut Off Valve for Natural Gas shall be: A plug, ball or eccentric type rated for the pressure and temperature to which it will be subjected The gas line serving appliances in a recreational vehicle shall be purged of air: At an open top burner using a lighted taper An indication of excessive Primary Air is a: Lifting Flame What takes place at the Heat Exchanger in a Forced Air Furnace: Return Air is heated A Draft Hood will: Prevent a down draft from entering the appliance Air passing over a heat exchanger is heated by: Convection Most under fired storage Water Heater temperature controls utilize: Rod and Tube Sensors A yellow flame at an Atmospheric Burner could be the result of: Insufficient Primary Air The purpose of the High Limit Switch found on many gas fired appliances is to: Shut off the main gas valve should overheating occur A Noisy, lifting, blowing pilot flame is usually the result of: Excessive gas to the main burner A residential central forced air gas furnace heating system works n the principle of drawing: Conditioned air from a central area of the house then forcing it across a heat exchanger and returning back into the house through supply air ducts Which method of heat transfer is used in a standard gas-fired over: Convection If upon reactivation of an appliance a G-3 technician notices flame roll-out, the technician is required to: Turn off the Gas Supply and notify the Supervising Certificate Holder to repair the problem The configuration of a "Hi-Boy" forced air furnace is: Supply air entering at the top and return air exiting at the bottom Convection is: The transfer of heat by the movement of fluids Infra-red Heaters may not be used in: Occupied residences Which method of Heat Transfer is used in a Clothes Dryer: Convection If the gas/air velocity is too great at the port of an Atmospheric Burner, the flame with have a tendency to: Lift of the port Infra-red tube heaters transfer heat by: Radiation Atmospheric Burners are designed to operate under: Normal atmospheric pressure with low gas pressure What would the likely cause be if orange flashes were evident in a gas flame: Dust burning in the flame An orifice for propane appliance with the same input as a natural gas appliance is: Smaller than the natural gas orifice Lead Shields are generally used to anchor fasteners into: Concrete 1 imperial gallon of Propane weighs: 5.1 pounds The boiling point of Propane at atmospheric pressure is: -44*F The specific Gravity of Propane is: 1.52 Which substance is inert and passes through the combustion zone absorbing heat during the combustion process: Nitrogen A luminous flame is caused by: Not enough premixing air and fuel prior to combustion The oudarant added to Natural Gas and Propane for detection purposes is: Mercaptan What is approximate ignition temp of Natural Gas: 1200*F Where the heat exchanger of an appliance installed in a dwelling unit is found to be defective: The heat exchanger must be replaced What is the term fr a regulation device that is adjusted to deliver gas at atmospheric pressure within is flow rating: A Zero Governor Which of the following establishes minimum standards for the repair and servicing of gas appliances: Canadian Standards Association A person who has to work on a boiler where asbestos has to be handled must refer to the: Occupational Health and Safety Act and Regulations Which type of pilot is supervised by a primary safety control which must sense the presence of the pilot flame prior to gas being admitted to the main burner: Proved Pilot Any person who is served with an order to comply may: Appeal to the director for changes to the order Which type of pilot burns at low turn-down throughout the entire time the burner is in service, whether or no the main burner is firing, except 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? An Expanding Pilot What is the Category 3 Appliance: An appliance that operates with a positive vent static pressure and a flue loss of not less than 17% What is the Category 2 Appliance: An appliance that operates with a non-positive vent static pressure and a flue loss of less than 17% As the current increases in a conductor the magnetic field around the conductor: Increases Which of the following statements concerning a series electrical circuit is correct? If one load opens in a series circuit then all loads will stop operating Which meter is used to check for continuity? Ohm Meter In a parallel circuit containing a 3-ohm, a 7-ohm and a 10-ohm resistor, the current flow is: Highest through the 3-ohm resistor If a scale on a mechanical drawing is 1/8" - 1'0" then a line measuring 4" in length is actually 32 feet A mechanical drawing is used to: Give the building address, show the equipment location, piping layout duct sizing and duct layout To correct a symptom such as a fluctuating flame, a technician should first: Consult the manufacturer's instructions Gasket material used in a gas system shall be: Neoprene A load measures 120 volts across it but the load does not work. What is your diagnosis? Faulty Motor What is the formula for finding the resistance in a an electrical circuit? R = E/I Why is the manifold pressure important when setting up an appliance being converted from one fuel to another? Gas / Air ratio will not be correct for proper combustion A luminous flame will occur if there is a) too much or b) too little - fuel in ratio to air? b) Too little fuel in ratio to air (will cause a luminous flame) A/n ______________ controls the gas input to the burner. An Orifice A boiler shall conform to the requirements of? The Boiler & Pressure Vessel Act Recessed wall heaters use Type _______ vent. Type BW vent Name the appliance that commonly uses a Rod and Tube type control. Water Heater Can an Infrared heater be installed in a School? Yes Can a construction heater be installed in an occupied dwelling unit? Reference? No - 7.18.9 What unit of electricity remains the same in a series circuit? Ampheres/Current How far above a floor can a relief valve of the water discharge be? Reference? 12feet - 7.27.2 What letters are found on a terminal strip for a furnace or thermostat? R- 24v W- Heat Y- Cooling G- Fan ( sometimes C- Common) What part of the code do you make reference to when converting an appliance from gas to fuel specified on the rating plate? 4.5.4 or 7.6 Conduction is the form of heat transfer through a: Substance. The passing of energy from particle to particle True or False- The series parallel circuit is the most common type of circuit used in gas appliances True Which of the following may be used as a neutral wire? White Which of the following types of fire extinguishers should be used on electrical fires? Class C To determine the indicated gas pressure on a simple or traditional water-filled "U" tube manometer you: Read the amount of water column displaced on the pressure side and add it to the amount displaced on the atmospheric side The heat content of 1 cubic foot of Natural Gas is approximately: 1,000 Btu In cases of a threat to public safety, a Director may make orders: Related to matters that have not been provided in the Act Propane cylinders used in Ontario must be manufactured and approved to the requirements established by: Transport Canada When the installation of an appliance constitutes a conversion from another form of energy to gas, the installer must: Advise the user in writing of the follow in discontinuing the supply of the former form of energy Potential is measured in: Volts The total current in a parallel circuit (I.e. taken at source) will be: The sum of the current passing through each branch circuit The the absence of a readily accessible burner, an appliance not equipped with a continuous pilot shall be purged in accordance with: AnnexH of the B 149. 1-05 code The actual pressure drop in a gas line is measured by subtracting the: Working pressure at the appliance from the working pressure at the gas meter If the return and supply air plenum are both located on the top of the furnace, the furnace is a: Low Boy Conduction is: The transfer of heat from Particle to Particle The configuration of a "HI BOY" forced air gas furnace has: The supply air exiting at the top and return air entering at the bottom What type of venting does a Surface Combustion Infrared heater requires: No Vent A yellow flame at an atmospheric burner could be the result of: Insufficient primary air