HVAC Study Test
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Questions and Answers

  1. How many classes of fire extinguishers are listed?

  • three
  • four (correct)
  • five
  • six

    1. To determine the indicated gas pressure on a water-filled "U" tube manometer.

  • A. read the amount of water column displaced on the pressure side.
  • B. read the amount of water column displaced on the atmospheric side.
  • C. read the amount of water column displaced on the pressure side and add it to the amount displaced on the atmospheric side. (correct)
  • D. read the amount of water column displaced on the pressure side and subtract it

    1. A carbide bit is used to drill into:

  • A. steel. (correct)
  • B. wood.
  • C. iron.
  • D. black iron.

    1. A carbon bit is used to drill into:

    <p>D. concrete.</p> Signup and view all the answers

    1. Lead shields are generally used to anchor fasteners into:

    <p>D. concrete</p> Signup and view all the answers

    1. The ignition temperature of propane is:

    <p>B. 920°C -1020°C. (1688 F-1868 °F)</p> Signup and view all the answers

    1. One imperial gallon of propane weighs.

    <p>A. 5.1 pounds.</p> Signup and view all the answers

    1. When one pound of propane burns, it releases approximately:

    <p>C. 21,600 Btu.</p> Signup and view all the answers

    1. The amount of air required to bum 1 cubic foot of natural gas is approximately:

    <p>B. 10.0 cu. ft. (0.28 cu. m.)</p> Signup and view all the answers

    1. What theoretical gas-to-air ratio is necessary to achieve perfect combustion with an atmospheric natural gas burner?

    <p>A. 1 part of natural gas to 10 parts of air</p> Signup and view all the answers

    1. At 60 F (15.5°C) a pound of propane produces how many cubic feet of gas?

    <p>C. 8.50</p> Signup and view all the answers

    1. Propane shall have a distinctive odour content to ensure it is readily detectable in the atmosphere down to concentrations of:

    <p>B. 20% of the lower explosive limit.</p> Signup and view all the answers

    1. The requalification of refillable propane cylinders used in Ontario must be done in accordance with the procedures for cylinders as established by the:

    <p>B. Compressed Gas Association</p> Signup and view all the answers

    1. Which organization registers certified gas and oil technicians in Ontario?

    <p>B. The Ministry of Energy</p> Signup and view all the answers

    1. What is the name of the part of a piping or tubing system which conveys gas from the main supply piping, tubing, or header to an appliance or appliances:

    <p>B. branch line</p> Signup and view all the answers

    1. Which code expression describes a building used in connection with production or process work, or with storage or warehousing:

    <p>D. industrial building</p> Signup and view all the answers

    1. Which term is used to describe an appliance intended to supply hot liquid or vapour for space heating, processing, or power purposes

    <p>D. boiler</p> Signup and view all the answers

    1. Which type of appliance has the combustion products or flue gases mixed with the medium being heated:

    <p>A. direct fired appliance.</p> Signup and view all the answers

    1. Which of the following is an appliance draft control device:

    <p>C. a draft hood or draft regulator</p> Signup and view all the answers

    1. What is the name of the device that is installed either externally or internally to a venting system to extract heat from flue gases:

    <p>D. heat reclaimer</p> Signup and view all the answers

    1. Which type of appliance does not have the flue gases mixed with the medium being heated:

    <p>D. indirect fired appliance</p> Signup and view all the answers

    1. What is the term for an appliance which is supplied as a complete unit, including burner, controls, and integral wiring:

    <p>A. package unit</p> Signup and view all the answers

    What is the term for a device that is installed between the appliance and the vent termination and provides mechanical draft:

    <p>D. power venter</p> Signup and view all the answers

    1. A "relief device" in a piping system is a/an:

    <p>C. device designed to open to prevent a rise of gas pressure in excess of a specified value due to emergency or abnormal conditions</p> Signup and view all the answers

    1. A "quick-disconnect device" is:

    <p>D. a hand-operated device which provides for connecting and disconnecting an appliance to a gas supply</p> Signup and view all the answers

    1. An appliance pressure regulator is:

    <p>B. located in the valve train of an appliance</p> Signup and view all the answers

    1. What is the name for a valve designed to close when the liquid or vapour passing through it exceeds a prescribed flow rate as determined by a pressure drop across the valve:

    <p>A. maximum capacity valve</p> Signup and view all the answers

    28 . What is the term for a regulating device that is adjusted to deliver gas at atmospheric pressure within its flow rating:

    <p>A. zero governor</p> Signup and view all the answers

    1. An under-fired storage water heater shall always:

    <p>C. have a temperature and pressure relief device</p> Signup and view all the answers

    1. The air supply for central heating furnaces, boilers and water heaters that have an input of less than 400,000 Btu/h (120 kW) shall be provided in accordance with:

    <p>A. clauses 8.2 &amp; 8.3 of the B149.1 gas code</p> Signup and view all the answers

    1. Vent sizing for central heating furnaces, boilers and water heaters that have an input of less than 400,000 Btu/h (120 kW) may be provided in accordance with:

    <p>D. clause 8.13 of the B149.1 code</p> Signup and view all the answers

    1. To determine the specific purpose an appliance is to be used for, the __________________ should be consulted.

    <p>B. customer's maintenance instructions manual</p> Signup and view all the answers

    1. When referring to appliance manufacturer's instructions, the natural gas and propane installation code:

    <p>D. requires that they be left with the end user</p> Signup and view all the answers

    1. By covering a piece of wood with 1/4" (6 mm) of insulating millboard and 28 gauge (0.3mm) sheet metal, a person may reduce the side clearance of an appliance that requires 6 inches (150 mm) clearance from combustible material:

    <p>A. by 4 inches (100 mm)</p> Signup and view all the answers

    1. Instructing the user in the safe and correct operation of newly installed appliances or equipment is the responsibility of the:

    <p>D. appliance installer</p> Signup and view all the answers

    1. When a new appliance is to be installed where the municipality requires work permits and inspections for every installation:

    <p>C. it Is the responsibility of the installer to secure the necessary permits and the inspections</p> Signup and view all the answers

    1. What is the largest size of propane cylinder manufactured:

    <p>D. 1,000 lbs. WC (454 kg)</p> Signup and view all the answers

    1. When cylinders are being transported, they shall be secured:

    <p>C. in an upright position, in a well-ventilated location with the relief valve communicating with the vapour space only</p> Signup and view all the answers

    1. On a roof with a 12/12 pitch and no obstructions, the minimum vent height is:

    <p>B. 4 feet</p> Signup and view all the answers

    1. Which information is in both the Natural Gas and Propane code books?

    <p>A. responsibility of the installer, individual installation data for each type of appliance, clearances from combustibles, piping practices, pipe sizing charts, venting tables</p> Signup and view all the answers

    41.To correct a symptom such as a fluctuating flame:

    <p>C. consult the manufacturer's check list.</p> Signup and view all the answers

    1. Drawings that show multiple views of an object for clarification are called:

    <p>B. Orthographic drawings</p> Signup and view all the answers

    1. What theoretical gas to air ratio is necessary to achieve perfect combustion with an atmospheric natural gas burner?

    <p>A. 1 part of natural gas to 10 parts of air</p> Signup and view all the answers

    1. The Ontario Natural Gas Utilization Code is used to determine:

    <p>C. regulations for installing gas appliances.</p> Signup and view all the answers

    1. No one may initially activate a 300,000 Btuh input appliance connected to a piping system:

    <p>B. unless the installation is inspected by a G.2 technician or higher.</p> Signup and view all the answers

    1. A draft hood will:

    <p>D. prevent down a draft from entering the appliance</p> Signup and view all the answers

    1. The configuration of a "Hi Boy" forced air gas furnace has:

    <p>D. supply air exiting at the top and return air entering at the bottom.</p> Signup and view all the answers

    1. If the return and supply air plenum are both located on the top of the furnace, the furnace is a:

    <p>B. low boy</p> Signup and view all the answers

    1. Decorative appliances to be installed in vented fireplaces mounted on a grating system are usually referred to as:

    <p>D. gas logs.</p> Signup and view all the answers

    1. Infrared heaters may not be used in:

    <p>C. Occupied Residences</p> Signup and view all the answers

    1. If the gas/air velocity is too great at the port of an atmospheric burner, the flame will have a tendency to:

    <p>B. lift off the port.</p> Signup and view all the answers

    1. Mechanical drawings are used to:

    <p>B. give the building address, indicate the building size, show its elevations, list the mechanical equipment, and show its location, show all permits.</p> Signup and view all the answers

    1. A "bill of materials" is a:

    <p>A. list sent by the manufacturer as a check list of the materials delivered to the site.</p> Signup and view all the answers

    1. Equipment specifications indicate mainly:

    <p>A. dimensions required to install the appliance, weight of the equipment, electrical characteristics, size and location of the vent outlet, piping inlet size, model number.</p> Signup and view all the answers

    1. Which information is in both the Natural Gas and Propane code books?

    <p>A. responsibility of the installer, individual installation data for each type of appliance, clearances from combustibles, piping practices, pipe sizing charts, venting tables.</p> Signup and view all the answers

    1. Safety directives and bulletins are published by:

    <p>C. TSSA</p> Signup and view all the answers

    1. Equipment service bulletins are normally issued by the:

    <p>B. manufacturer.</p> Signup and view all the answers

    1. All furnace appliance manufacturers' literature gives the name of the manufacturer, the:

    <p>B. Btuh input, fan size, CFM, voltage, fuse size, and the physical dimensions.</p> Signup and view all the answers

    1. Carbon monoxide is produced through:

    <p>D. incomplete mixing of theoretical air and primary air.</p> Signup and view all the answers

    1. The products of complete combustion of natural gas and propane are primarily:

    <p>C. water (vapour), carbon dioxide, and heat.</p> Signup and view all the answers

    1. What code or regulation applies to a propane-supplied mobile home that has been converted to a permanent home:

    <p>B. B149.1</p> Signup and view all the answers

    1. What is the term for a pressure regulator installed in a piping or tubing system downstream of the service regulator and upstream of the appliance regulator:

    <p>D. system regulator</p> Signup and view all the answers

    1. What is meant by purging a pipe system:

    <p>D. replacing the existing (gaseous or liquid) fluid in the piping or tubing with a desired fluid</p> Signup and view all the answers

    1. Which type of draft is produced by a device upstream of the combustion zone of an appliance:

    <p>B. forced draft</p> Signup and view all the answers

    1. Which type of draft is produced by a device downstream of the combustion zone of an appliance:

    <p>C. induced draft</p> Signup and view all the answers

    Which burner supplies combustion air with a mechanical device such as a fan or blower at sufficient pressure to overcome the resistance of the burner and the appliance:

    <p>D. forced draft burner</p> Signup and view all the answers

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