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What are the three functions of a regulator? - correct answer -1. To reduce and maintain constant downstream pressure 2. To allow pressure adjustments to the appliance 3. To provide a smoother even flow What are the three operating forces of a gas regulator? - correct answer -1. Measuring element (diaphragm) 2. Restricting element (orifice) 3. Loading element (spring) What is the closing force in a regulator? - correct answer -Downstream gas pressure What are three functions of regu...

What are the factors governing a conversion? - correct answer Availability of gas, efficiency if converted, access to combustible air, satisfactory ductwork, can a chimney liner be installed, clearances from combustibles, manufactures recommendations, if a water heater is also being installed (common vent or power vent), and age of the appliance Oil fired furnaces are recommended not to be converted at a certain age what is age is this? - correct answer 10 years clause 4.3.5 What are the r...

What is a temperature control made of in a water heater? Which one is the sensing element? - correct answer -Rod and tube. Rod is steel and tube is copper. Copper is the sensing element. Temperature settings on a water heater? - correct answer -Hot - 160 F Normal - 130 F Warm - 120 F What does a unitrol have in it? - correct answer -Temperature and pressure relief valve, E.C.O., Main Gas valves, Pilot Gas Valve and a gas regulator What temp does a temperature and pressure relief valve...

If the venting on a high efficiency furnace runs through unheated spaces, what must be done? - correct answer -Insulate piping to prevent Condensation and freezing What is condensate drain piping used for? - correct answer -Dispose Liquid waste Once the furnace is installed, what are the gas technician's responsibilities to the user? - correct answer -To instruct the the user in the safe and correct operation of all appliances and equipment - clause 4.3.2 Which furnace type is the most...

What prevents the water in a hydronic heating system from boiling into steam when the system is operating above the atmospheric temperature? - correct answer -Pressurization of the system List the four subsystems of a hydronic space heating system? - correct answer -Heat Source, Circulation system, Heat Emitters, Control system What must be done to protect the potable water supply to a hot water boiler? - correct answer -Approved backflow preventer installed in the water supply Above wh...

What type of vent is used on a wall furnace? - correct answer -BW Venting What temperature does a low-intensity infrared heater fire at? where are they used? - correct answer -1200 F and are used in factories and commercial buildings How does a low intensity infrared heater work? - correct answer -Gas burner fires into mouth of tube and hot flue gases travel through tube. It emits infrared heat which is directed by reflector suspended above the tube. What are high intensity infrared hea...

What pressure does atmospheric pressure exert on the earth at sea level? - correct answer -14.74 psia What two things mean you must bring in combustion air. - correct answer -1. Total BTU of appliance if greater than 400000 you must bring in combustion air. 2. If house is tight construction you also must bring in air. What is the maximum flue gases should be for a natural draft system? Why? - correct answer -450 F is the max this is because safety concerns of having high heat in a combust...

Why are air cleaners installed ahead of heating or cooling coils and air conditioners? - correct answer -To protect the equipment from dust and increase efficiency What are two ways in which a mechanical filter could restrict air flow? - correct answer -Dirty Air Filter and Incorrect Air Filter Name three types of air cleaners that can be used with a forced-air furnace? - correct answer -Media, electrostatic, and electronic Which type of air cleaner is usually the least expensive? - cor...

List two sources of regulations and standards of practice that influence decisions concerning air flow in residential construction. - correct answer -F280 and F326 Name three methods of heat transfer. - correct answer -Conduction, Convection and Radiant What is enthalpy? - correct answer -All of sensible heat, latent heat contained in a substance when heat is being transfer Why is air movement an important consideration for building comfort? - correct answer -Air movement decrease or in...

The ventor motor on a power vent water heater fails, this component prevents operation? a)Pressure relief valve b)ECO switch c)High limit switch d)Pressure Switch - correct answer -Pressure Switch What is the ignition temperature for natural gas? a)920 degrees Fahrenheit b)1000 degrees Fahrenheit c)1300 degrees Fahrenheit d)3600 degrees Fahrenheit - correct answer -1300 Degree F A yellow flame is the result where there is no premixing of primary air with gas prior to ignition. Wha...

(10) What is a Servo? - correct answer -A mechanism set in motion by other mechanisms (10) What is Setpoint? - correct answer -The desired outlet perssure (10) Which regulator is more accurate; pilot operated or direct operated? - correct answer -Pilot operated (10) In which applications are pilot operated regulators normally employed other than servo regulation? - correct answer -High capacity applications in commercial, institutional, and industrial settings. (10) How is the accura...

What is the minimum diameter of a pressure gauge needed to perform leak test on gas piping? A. 2" B. 2 - 3/4" C. 3" D. 3 - 1/2" - correct answer -c. 3" Amp meter can read what? A. Pressure drop. B. Conductor magnetic field. C. Load in parallel wires. D. Direct power across loads. - correct answer -B. Conductor magnetic field. What would be the primary voltage of a furnace? A. 120/2/60. B. 24/1/60. C. 120/24/60. D. 120/1/60. - correct answer -D. 120/1/60. What i

A room heater installed in either a sleeping area or public area shall be: A. direct vent only B. equipped with a regulator C. equipped with a fan D. equipped with an on / off switch on the wall - correct answer -B What type of vent must be used when the vent of a wall furnace will be concealed in a partition wall? A. B vent B. L vent C. BH vent D. BW vent - correct answer -D Single wall vent connectors: A. may pass through floors, ceilings or roofs provided a metal thimble is use...

An inline Ammeter is connected - correct answerIn series with the device being checked As the length of an Electrical run increases, it may be necessary to - correct answerIncrease the Wire Size Fuses serving motor circuits should be of - correct answerTime Delay Type Millivolt wiring should be isolated from Line Voltage Wiring because - correct answerThe Line Voltage will induce a voltage into the Millivolt Wiring Which tool is used to determine if the windings on an Electric Motor ...

On a pilot what causes a lazy yellow flame? - correct answer -Dirty lint screen Primary air opening Orifice too big Main functions of a gas regulator? - correct answer -Reduce and maintain downstream pressure.Pressure to appliance can be adjusted.Smooth and even flow. What does the measuring element do? - correct answer -Measures downstream pressure. What is the restricting element? - correct answer -Increases or decreases gas flow Loading element does what? - correct answer -set o...

NR 511 Final Exam 2023 with 100% correct answers

NR 511 Final Exam 2023 with 100% correct answers

NR 511 Final Exam 2023 with 100% correct answers

NR 511 Final Exam 2023 with 100% correct answers

NR 511 Final Exam 2023 with 100% correct answers