GAS Interprovincial Flashcards
A thermocouple must be under load to perform an open circuit test.
True
False
False
Which of the following pipe sizes uses a thread pattern of 11.5 threads per inch?
NPS 1/4
NPS 3
NPS 1
NPS 4
NPS 1
In reference to a thermostatic gas control, what does ECO stand for?
A) Energy Contact Open
B) Energy Cut Off
C) Efficiency Contact Order
D) End Cycle Over
B) Energy Cut Off
What is the term used to describe a meter scale which is very cramped on the high resistance end?
A) Cramped
B) Non-linear
C) Small linear
B) Non-linear
What type of transformer consists of a single coil that serves as both the primary and secondary windings?
A) AC transformer
B) DC transformer
C) Autotransformer
C) Autotransformer
What is always produced when current flows through a conductor?
A) A magnetic field is produced around the conductor
B) Light is produced around the conductor
C) Heat is produced around the conductor
A) A magnetic field is produced around the conductor
The sequence of operation of a circuit can be determined from what kind of drawing?
A) Schematic diagram
B) Connection diagram
C) Block diagram
D) Pictorial diagram
A) Schematic diagram
If a furnace system has air-conditioning added, where does the cased coil go?
A) Downstream of the burner and downstream of the blower
B) Upstream of the burner and upstream of the blower
C) Downstream of the burner but upstream of the blower
D) Upstream of the burner but downstream of the blower
A) Downstream of the burner and downstream of the blower
What prevents the water in a hydronic heating system from boiling into steam when the system is operating above the atmospheric boiling temperature?
A) Natural convection
B) Make-up water is added
C) Pressurization of the system
D) Constant circulation
C) Pressurization of the system
A lag bolt is what type of fastener?
A) Pipe
B) Electrical
C) General
C) General
Which three orthographic views of an object are most often projected?
A) Bottom, rear, front
B) Top, front, left side
C) Rear, top, bottom
D) Top, front, right side
D) Top, front, right side
What is the purpose of an operating pressuretrol?
A) To stop the boiler if the steam pressure gets too high
B) To start the boiler when the steam pressure drops
C) To shut-off gas supply in the event of an overpressure condition in the burner valve train assembly
D) To shut-off gas supply in the event of an under-pressure condition in the burner valve train assembly
A) To stop the boiler if the steam pressure gets too high
What reading should an open circuit test on a thermocouple produce?
A) 9 mV
B) 17 mV
C) 30 mV
D) 250 or 750 mV
C) 30 mV
What is the recommended maximum port diameter for drilled port atmospheric burners?
A) No. 29 drill
B) No. 12 drill
C) No. 42 drill
D) No. 56 drill
A) No. 29 drill
A thermostatic radiator valve can be operated by mechanical or electric drive head.
A) True B) False
True
List the adverse effects from ultraviolet radiation produced by arc welding.
A) Hearing loss
B) Burns to eyes and skin from a reflection off bright objects
C) Burns to eyes and skin from hot metal and sparks
B) Burns to eyes and skin from a reflection off bright objects
How long should a gas range operate before adjusting the oven temperature calibration?
A) 1 minute
B) 5 minutes
C) 15 minutes
D) 30 minutes
C) 15 minutes
Atoms are made of what three particles?
A) Neutrons, protons, electrons
B) Neutrons, ions, electrons
C) Protons, electrons, ohms
A) Neutrons, protons, electrons
A water heater equipped with an ECO will activate when the temperature of the water in the tank exceeds what temperature?
A) 200°F (94 °C)
B) 250°F (120 °C)
C) 100°F (38 °C)
D) 140°F (60 °C)
A) 200°F (94 °C)
Which of the following factors does not affect the electrical resistance of the human body?
A) Moisture
B) Salt
C) Temperature
D) Abrasions on the skin
C) Temperature
What is the unit to indicate the strength of electromotive force?
A) Amps
B) Ohms
C) Volts
C) Volts
If the vent connectors are connected to a horizontal common vent connector manifold, how must the common vent capacity table be adjusted?
A) Increase 10%
B) Reduced by 10%
C) Increase by 11%
D) Reduced by 11%
B) Reduced by 10%
What material is recommended for condensate piping after connecting to the appliance?
A) Rigid PVC piping
B) Flexible PVC tubing
C) Any steel pipe material
D) Any plastic pipe material
A) Rigid PVC piping
How is the coarseness of hack saw blades determined?
A) Length of teeth
B) Number of teeth per inch
C) Width of teeth
B) Number of teeth per inch
What type of furnace would use a vent damper?
A) Mid-efficiency only
B) Low efficiency only
C) Low-efficiency and mid-efficiency
D) All types of furnaces use vent dampers in the ducting system
A) Mid-efficiency only
What is the maximum setting for a pool boiler’s operating aquastat?
A) 100°F (38 °C)
B) 140°F (60 °C)
C) 160°F (71 °C)
D) 180°F (82 °C)
A) 100°F (38 °C)
How do you determine what wires are for which speed tap on a multispeed PSC direct drive motor?
A) Wiring schematic colour codes
B) Trial and error
C) Furnace specifications
D) Control board schematic
A) Wiring schematic colour codes
Suppose that upon testing a furnace, the fan motor will not run. The burner is operating, the heat exchanger temperature is above the fan-on setpoint and the fan switch contacts are open. What should you do?
A) Replace the fan
B) Replace transformer
C) Replace the fan switch
D) Replace the thermostat
C) Replace the fan switch
When during a piping installation should pressure testing be carried out?
A) After all of the appliances have been installed and connected.
B) Before any appliance is installed. A leak test is required after the appliance is installed.
C) Before any appliances are installed
A) After all of the appliances have been installed and connected.
Referring to CSA B149.1, do the requirements of Clauses 8.2 to 8.5 apply to a direct-vent appliance?
A) True B) False
false
What type of armoured cable should be used for installations subject to adverse service conditions?
A) AC
B) ACL
C) ACWU
D) TECH
D) TECH
If you have three certified metal flexible connectors of different lengths, they will all have the same gas flow capacity.
A) True B) False
false
What are the requirements for joints in steel piping used in gas systems?
A) Compression fittings
B) Threaded, flanged or welded
C) Joints properly sealed with pain
B) Threaded, flanged or welded
What is the danger of having too little ventilation in a dwelling?
A) Higher cost to ventilate
B) Excessive depressurization
C) Lead to a build up of pollutants
D) Can drive moist air into wall cavities
C) Lead to a build up of pollutants
What must be done to remove accumulated debris in a sand filter?
A) Nothing is done
B) The filter must be replaced
C) Change the sand
D) Backwashing
D) Backwashing
What is the ideal relative humidity?
A) 15% to 25%
B) 25% to 35%
C) 35% to 50%
D) 45% to 65%
C) 35% to 50%
Complete the following statement:
The approximate explosive limits of propane gas range from ________ to ________ propane in air.
A) 5% to 15%
B) 2% to 10%
C) 7% to 10%
D) 2% to 15%
B) 2% to 10%
Which type of hammer is used to shape metal?
A) Claw hammer
B) Finishing hammer
C) Ball–peen hammer
D) Shaping hammer
Ball–peen hammer
Who is responsible for piping downstream of a gas utility meter?
A) Property or building owner
B) Fuel supplier
C) Installer
Property or building owner
Clothes dryers can be vented inside to capture heat energy.
A) True B) False
false
Which of the following is not a general way graphs and charts are used?
A) Determining location of equipment
B) Graphical presentation of information
C) Graphical analysis
D) Computing or determining values
A) Determining location of equipment
Position and location are important factors for thermostat installation.
A) True B) False
true
Which is the better way of communicating with a person who speaks little English?
A) Speaking slower
B) Speaking louder
C) Speaking louder and slower
A) Speaking slower
What is a forced draft?
A) Draft produces by mechanical device downstream from the combustion zone.
B) Draft produces by mechanical device upstream from the combustion zone.
C) Draft produces by the upward movement of hot gases, creating a negative pressure.
D) A condition in which a draft is forced downward and can cause flue gas spillage.
B) Draft produces by mechanical device upstream from the combustion zone.
A customer complains that there is no heat in the top floor of a hydronic heating system. What is the most likely cause?
A) Zone valve is stuck open
B) Air lock in system
C) Pump is oversized
D) Static pressure too high
B) Air lock in system
With what are oxygen and acetylene cylinders fitted to minimize the possibility of explosion in case of fire?
A) Shut off valves
B) Fusible plugs
C) Regulators
B) Fusible plugs
Correctly complete the following sentence with the appropriate number provided: 100 000 Btu/h requires _________ ft3 combustion air.
A) 1 000 ft3
B) 10 ft3
C) 100 ft3
D) 10 000 ft3
A) 1 000 ft3
Refrigerant circulates between the “A” coil and the condenser coil. What occurs in the A coil?
A) Liquid refrigerant absorbs heat and changes to the vapour state
B) Vaporous refrigerant absorbs heat and changes to the liquid
C) Heat is removed causing the vaporous refrigerant to return to a liquid state
D) Heat is removed, causing the liquid refrigerant to change to the vapour state
A) Liquid refrigerant absorbs heat and changes to the vapour state
What should be done first if you have a static pressure across the coil that is beyond the manufacturer’s suggested limits?
A) Clean the unit
B) Clock the appliance
C) Adjust the blower speed
D) Measure the temperature change
A) Clean the unit
Why are electric power tools equipped with three-prong electrical plugs?
A) The third prong is a ground for protection in case of short circuit
B) The third prong prevents the plug from being installed upside down
C) The third prong is a backup power feed to ensure performance
A) The third prong is a ground for protection in case of short circuit
Residential storage-type gas water heaters have been made more resistant to accidents caused by mishandling or improper storage of gasoline or other flammable materials. What is the common name for this type of technology?
A) ULC
B) ECO
C) FVIR
D) T & P
C) FVIR
How can multiple wireless temperature sensors that use short range protocols such as Z-Wave and Zigbee achieve a longer range?
A) Hard wire
B) AC adapters
C) Mesh network
D) Signal boosters
C) Mesh network
The combustion products of a construction heater are vented into the heated area.
A) True B) False
True
What procedure should be used to identify if the test dial has possibly moved back to its original position when conducting a working pressure leak test using a diaphragm meter?
A) Turn of the gas
B) Mark both test dials
C) Mark the position of the smallest test dial
D) Mark two positions on the smallest test dial
B) Mark both test dials
What type of BH vent is PVC?
A) Class I
B) Class II A
C) Class II B
D) Class II C
B) Class II A
Which of the following is not a common screwdriver tip used by a gas technician/fitter?
A) Straight blade
B) Philips
C) Robertson
D) Tri-wing
D) Tri-wing
Which of the following conditions are not regulated in a hot water boiler?
A) Firing of the boiler
B) Boiler water temperature
C) Venting pressure
D) Circulating pump
C) Venting pressure
What is the measuring element of a regulator?
A) Spring
B) Valve disc
C) Diaphragm
D) Atmospheric vent
C) Diaphragm
also called sensing
What does the term “impedance” mean?
A) Impedance is the total flow of current in a circuit and is comprised of a circuit’s resistance and reactance.
B) Impedance is the total magnetism in the flow of current in a circuit and is comprised of a circuit’s resistance and reactance.
C) Impedance is the total opposition to the flow of current in a circuit and is comprised of a circuit’s resistance and reactance.
C) Impedance is the total opposition to the flow of current in a circuit and is comprised of a circuit’s resistance and reactance.
Can gas piping be passed under a building?
A) Yes, if it is at least 24 inches (610 mm) below the footings
B) Yes, if it is at least 15 inches (400 mm) below the footings
C) No
C) No
Which type of support is commonly used by the gas technician/fitter to install vertical piping?
A) Pipe strapping
B) Riser clamp
C) Not required for vertical piping
B) Riser clamp
List the gases that may be present in sewer gas.
A) Methane
B) Helium
C) Argon
D) Freon
A) Methane
Which of the following describes a symmetrical load?
A) An object that, because of its uniform shape and composition, has its center of gravity located exactly in its middle.
B) An object that, because of its odd shape and composition, has its center of gravity located off center.
A) An object that, because of its uniform shape and composition, has its center of gravity located exactly in its middle.
The main function of the orifice housing is to provide a correct air-gas ratio.
A) True B) False
false
What determines the maximum length of the exhaust system?
A) Type of exhaust hood
B) Type of vent material
C) Number of elbows
D) All of the choices
D) All of the choices
What is an example of the benefit of electrochemical action?
A) The light bulb
B) The dry cell battery
C) Corrosion
B) The dry cell battery
How are the joints on a BH Class II, C temperature rated, vents secured?
A) Gear clamps
B) three screws
C) Locking bands
D) Solvent cement
C) Locking bands
Which of the following are four common fuels found in the commercial/industrial environment?
A) Gasoline, methanol, propane, natural gas
B) Gasoline, diesel, propane, natural gas
C) Gasoline, diesel, ethanol, propane, natural gas
D) Gasoline, biodiesel, methanol, natural gas
B) Gasoline, diesel, propane, natural gas
Which type of flue gas analyzer allows you to adjust the burner while watching the results on a monitor?
A) The liquid type analyzer
B) The continuous sampling type
C) The tube type analyzer
B) The continuous sampling type
What are the minimum dimensions of an access opening to a space containing a gas appliance?
A) 24 × 30 in (610 × 760 mm)
B) 18 x 18 in (450 x 450 mm)
C) 30 x 30 in (760 x 760 mm)
D) 24 x 24 in (610 x 610 mm)
A) 24 × 30 in (610 × 760 mm)
What type of unit heater produces low pressure, high volume flow?
A) Blower type
B) Axial fan type
C) Counterflow type
D) Low intensity type
B) Axial fan type
Match the correct depth of cover required on an underground gas line for the following installations?
1.Residential -
- Commercial Driveway -
- Secondary service to residential garage - 24 inches
- Residential - 15 inches (375 MM)
- Commercial Driveway - 15 inches (375mm)
- Secondary service to residential garage - 24 inches (600mm)
What type of unit heater produces low pressure, high volume flow?
A) Blower type
B) Axial fan type
C) Counterflow type
D) Low intensity type
B) Axial fan type
Despite their similarity in outward appearance to the contacts in a light switch, how are the contacts in a toggle motor starter different?
A) They are current rated
B) They are horsepower-rated
C) They are located on the neutral leg
D) They have solder only wiring connections
B) They are horsepower-rated
Switches are always located in the hot leg of a circuit.
A) True B) False
True
During the lighting of a barbecue, the lid must be closed.
A) True B) False
false
What type of mechanical ventilation system creates a negative or suction pressure and fresh air enters the building by infiltration?
A) Balanced
B) Direct duct
C) Supply only
D) Exhaust only
D) Exhaust only
The average stack temperature is the average between the temperature at the flue collar and the temperature at the vent termination.
A) True B) False
true
How far above ground level should the exhaust hood terminate?
A) 8 inches (200 mm)
B) 12 inches (300 mm)
C) 20 inches (500 mm)
D) 40 inches (1000 mm)
B) 12 inches (300 mm)
Why is it important to examine the chimney or vent stack when visiting a premise to work on gas equipment?
A) To reduce the risk of CO poisoning due to venting system problems
B) To ensure there are no animals in the vent that could get hurt
C) To ensure the chimney or vent has been properly cleaned
A) To reduce the risk of CO poisoning due to venting system problems
The vent for a fan assisted appliance with a 4” flue collar may be reduced to 3” if determined by the tables.
A) True B) False
True
What two inert gases may be used to pressure-test gas piping systems?
A) Nitrogen and Hydrogen
B) Argon and Carbon dioxide
C) Carbon dioxide and Nitrogen
D) Hydrogen and Argon
C) Carbon dioxide and Nitrogen
Assuming all of the propane cylinders are ¼ full, which one will have the higher Btu/h vaporization rate?
A) 20 #
B) 40 #
C) 200 #
D) 300 #
D) 300 #
