Questions and Answers
What is propane when extracted?
Odorless and colorless
What is the device used on a propane tank to reduce pressure called?
Regulator
What is the boiling point for propane?
-44°F (-42°C)
What happens to propane when it is heated?
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What is it called when an element or compound changes from the liquid phase to a vapor?
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What is the most important factor to consider when working with propane systems?
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What can propane do when it comes into contact with skin?
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Why is it important to wear gloves when using propane?
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What should be worn when working with propane?
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How should a service valve on a propane tank be closed?
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In a shop environment, what should always be worn?
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What should always be used when transporting or storing propane containers?
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Which service valve is mandatory in the RV industry?
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What is required to be part of ASME tanks that was not required before 1983?
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Where can the maximum allowable working pressure on an ASME tank be found?
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What are the most common securing methods for cylinders?
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Purging is necessary for which types of containers?
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For purging, you must increase pressure by 15 psi and _____ is the total number of purgings required.
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The tare weight of a cylinder is 19 pounds. The propane capacity is 20 pounds. To how many pounds should the cylinder be filled and to what level?
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What pressure will the relief valve function at for compressed air and propane?
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What can occur if a horizontal cylinder is not stored in its proper position?
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Which of the following is NOT an appurtenance?
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What do black or green connector knobs on Type 1 OPD service valves indicate?
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ASME tanks are usually bolted to what?
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On double cylinder assemblies, what should be ensured?
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When purging, what should be avoided?
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What can failure to purge when necessary cause?
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Cylinders should be filled using what method?
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When releasing an air/gas mixture of propane, ensure a minimum of _____ feet in every direction between the container and source of ignition.
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What does the lockup pressure test verify?
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What should be done immediately after conducting the operating pressure test?
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Any regulator pressure over _____ inches WC will require the regulator to be replaced.
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During a timed pressure drop test, if there is a pressure increase due to thermal expansion _____, and if there is a pressure drop _____
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What should be documented for a timed pressure drop test with a test apparatus?
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When adjusting a system regulator, the operating test should show a working pressure of about 11 inches, and the lockup pressure should never exceed _____ inches.
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The operating test is used to determine the pressure the regulator is giving when at least _____ of the appliance load is functioning.
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A regulator must have a rated capacity equal to or greater than the total Btu/Hr input of what?
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How long should the timed pressure drop test be conducted for?
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What is the most important reason to document tests?
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What should be documented for a timed pressure drop test when doing the test at the range?
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What does DWV mean?
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Why is ABS piping used in the RV industry?
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What does an RV water distribution system need?
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What might a customer experience if they complain of lukewarm water at one or more hot faucets?
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Sealants used when building city water test kits should be for what type of water?
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What sealant is most appropriate to use when assembling a city water test kit?
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Which step is part of a freshwater system inspection?
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When inspecting a freshwater system, what must be ensured?
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How long do demand system and air pressure tests last?
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NFPA 1192 requires potable water tanks to be _____, _____, and _____ before use.
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What is the main purpose of opening the faucets until the water runs clear?
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When de-winterizing, what is the purpose of opening the faucet in the coach?
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Choose from _____ grades of antifreeze that are suitable for the _____ when winterizing.
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During winterization of an entire RV water system, all water is replaced with what?
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What does the liquid waste holding tank contain, and what does the body waste holding tank contain?
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What can an anti-siphon trap device be substituted for?
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When an RV is equipped with a liquid waste holding system, what test should be performed for 15 minutes during a fixture flood test?
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When conducting PDI of a waste water system, what should be done before a flood test?
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What is the purpose of pouring another cup of antifreeze down the drain at various sinks when winterizing the waste system?
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After flushing and cleaning holding tanks during winterization, what should be done?
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Sewage wastewater holding tanks can receive discharge from how many RV fixtures?
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Which test requires the entire drainage system to be filled until water appears at the bottom of the lowest fixture?
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What is checked last during a flow test?
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Which statement is true regarding electrons in the outer orbits?
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What is a function of insulators?
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What is true about the ends of permanent magnets?
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If a length of wire carrying a current is bent to form a loop, where do the lines of force leave and enter?
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What is the symbol for current flow?
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What happens when two points of unequal potential or voltage are connected?
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What can be achieved by joining RV batteries in series?
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To properly measure current with a VOM, how must the VOM be connected?
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Convert 125 milliamps to amperes.
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What is the correct setting on a VOM for measuring DC Amperage?
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When using a voltmeter to test for voltage in a simple circuit, how should the meter be connected?
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Convert 400 millivolts to volts.
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What is the basic unit of resistance?
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At constant voltage, double the resistance is equal to _____ the current.
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In the final calculations of Ohm's Law, current is always expressed in what unit?
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When an accident occurs, who must it be reported to?
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Which of these is associated with system grounding?
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What is the intentional grounding of all metal noncurrent carrying parts of the electrical system called?
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An electrical circuit is any combination of a _____ and _____ connected together to permit electrons to travel around in a continuous stream.
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Components, devices, and equipment in the RV that utilize low-voltage direct current are often referred to as what?
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Receptacles located in which of these places must have GFCI protection?
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Batteries connected _____ provide a higher current capacity.
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Electrons are _____, and protons are _____.
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What is the function of a conductor?
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Current is measured in what unit?
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Electromotive force is equal to what?
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What can a parallel RV battery bank allow a technician to do?
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An unknown resistor is connected across a battery. The voltage across it is 12 volts and the current flowing is 4 amperes. What is the resistance of the resistor?
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In reference to current, what is the minimum threshold for irreparable damage to body tissues?
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In DC currents, what is the direction of current flow?
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Wire size is expressed in terms of what?
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What are the steps for measuring AC current on an analog or digital meter?
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When measuring current on an analog or digital meter, how should the meter capacity relate to the expected amperage?
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When testing for an electrical short during the hot skin test, where should one voltmeter probe be placed?
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If the skin of the unit is not hot, what will the voltmeter read?
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When conducting an AC voltage test, an acceptable reading will be at or near what voltage?
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When conducting an AC voltage test, how should the test probes be placed?
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Study Notes
Propane Properties and Safety
- Propane is odorless and colorless.
- The pressure-reducing device for propane tanks is a regulator.
- Propane has a boiling point of -44°F (-42°C) and expands when heated.
- Vaporization is the process of converting a liquid into vapor.
- Safety is the primary consideration when working with propane systems.
- Propane is flammable and can cause skin freezing.
Personal Protective Equipment
- Use gloves to protect skin from freeze burns when handling propane.
- Always wear safety glasses in a workshop environment.
- Appropriate gloves are essential when working with propane tanks.
Propane Tank Operations
- Close service valves on propane tanks by hand.
- When transporting or storing propane, use a POL plug or dust cap.
- Type I OPD service valves are required in the RV industry.
- OPD was mandated for ASME tanks after 1983.
Propane Tank Specifications
- The maximum working pressure for ASME tanks is indicated on the data plate.
- Cylinders are typically secured with adjustable straps or T-bars.
- New and contaminated containers require purging.
- The purging process involves increasing pressure by 15 psi and requires five purgings.
Cylinder Filling Protocols
- Tare weight of a cylinder is 19 pounds; fill to 39 pounds, at 80% capacity.
- Relief valves function at 375 psi; improper cylinder positioning can result in liquid propane entering the vapor system.
Appurtenances and Standards
- A mounting bracket is not considered an appurtenance.
- Black or green connector knobs indicate flow rating on Type 1 OPD service valves.
- ASME tanks are typically bolted to the frame of RVs.
Maintenance and Testing Procedures
- Proper installation requires the cylinder tray to be secured to the frame.
- Avoid creating a vacuum when purging containers that previously contained propane.
- Documenting procedures, such as the timed pressure drop test, protects against lawsuits.
Electrical Fundamentals
- DWV stands for drain, waste, and vent in plumbing.
- ABS piping is preferred in RVs for its impact resistance in cold weather.
- DC Loads refer to devices in the RV that use low-voltage direct current.
Water System Inspection
- Freshwater systems require pressure; a leak test is part of an inspection.
- Opening faucets during de-winterizing lets antifreeze out and air in.
- Potable water tanks must be sanitized, flushed, and drained per NFPA 1192 standards.
Waste Management Systems
- Grey water is stored in liquid waste holding tanks, while body waste goes into solid waste holding tanks.
- Static water tests are performed on liquid waste systems during fixture tests.
- Antifreeze should be poured down drains to check if P-traps are sealed.
Electric Current and Resistance
- Current is measured in amps; Ohm’s Law indicates that resistance impacts current flow inversely.
- Battery connections in parallel increase current capacity, while series connections increase voltage.
Meter Usage and Testing
- Always connect a voltmeter in parallel when measuring voltage; for current, series connections are necessary.
- Acceptable AC voltage readings should be around 120VAC.
- Measure current expecting meter capacity to exceed anticipated amperage.
- Place one voltmeter probe on an earth ground and the other on bare metal during hot skin tests.
Important Testing protocols
- Conduct timed pressure drop tests for a minimum of 3 minutes, measuring in inches of water.
- If testing shows pressure drop, locate and repair leaks before re-testing.
- Use the highest current range when measuring AC current.
Studying That Suits You
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Description
Prepare for the RVTI Level 1 certification with these flashcards focused on propane. From its properties to the devices used, this quiz will help solidify your understanding of propane-related concepts. Challenge yourself and ensure you're ready for your certification exam.