Mark's Study Guide
Determination of amperage can only be done using the device data plate or the device service manual.
False
Fiberglass and other nonmetal composite materials have eliminated the need to conduct a hot skin test.
False
Fuses are the only overcurrent protection devices authorized for use in RVs.
False
Maintenance-free batteries are only available in automotive batteries.
False
Overcurrent protection devices can be replaced with ones rated with the same or a higher current rating.
False
Solar power can only be used for battery charging.
False
Voltage drop has no affect on diagnosing an electrical system.
False
Automatic transfer switches do not have to be listed for RV use.
False ( All transfer switches should be listed for RV use.)
An __________ prevents any interconnection between batteries in the two systems.
Isolator/solenoid
Never take a hydrometer reading immediately after adding water or charging a battery.
True
Non-demand water systems use a small electric water pump, a faucet, and a switch.
True
Pipe joint compound must be nontoxic and insoluble in water.
True
Operating pressure test
Used to determine the pressure the system is delivering when at least 50 percent appliance load is functioning
Hydrometer
Used to measure the specific gravity in electrolyte
Pressure drop test
Used to test the entire system to ensure it is leak free
A ____________ is used to withdraw propane vapor to the service valve on both cylinders and tanks.
Vapor withdrawal tube
Lock-up pressure test
Verifies the pressure at which the regulator prevents flow of gas through the system
An anti-siphon trap vent device (ASTVD) may be substituted for a primary vent
False
Converter-only circuits work very well in RVs.
False
Explain what "listed" means.
"Listed" means that equipment or materials have been tested and evaluated and are suitable for the application for which they are to be used
Briefly describe the function of a power converter.
120-12 VDC
A proper mixture of engine coolant lowers the coolant freezing point to ___________ degrees F.
-34 degrees
A propane detector must be operational for a minimum of ___________ minutes before it can be tested.
1 minutes
In a fully charge lead acid cell, the specific gravity of the electrolyte at 70 degrees F to 80 degrees F is 1.265. A fully discharged cell at the same temperature will have a specific gravity of ____________.
1.11
Larger wires are normally used with the 12 VDC system because 12 VDC draws approximately ___________ times more current than the same equipment on 120 VAC.
10
What minimum gauge wire should be used for a 30 A circuit?
10
DOT/TC cylinders are required to be recertified at intervals of _________ years after their manufacture and every ____________ years thereafter.
12 10, 5 10
What is the primary power source in RVs?
12 VDC
What is the primary power source used in RVs?
12 VDC
The two electrical systems powered by battery on an RV are commonly called the ____________ and ______________.
12 VDC chassis system; 12 VDC house system
A 20-lb (9.1 kg) DOT/TC cylinder is half full at -5 degrees F (-21 degrees C). What is the approximate Btu/hr vaporization rate per hour?
12,150 Btu/hr. A DOT/TC cylinder at 50 percent full and at -5 degrees F, the Btu/hr vaporization capacity is 12,150 Btu/hr
When two 6-volt, 200 A batteries are connected in series with one 12-volt, 200 A battery in parallel, the output is _____________.
12-volt, 400 A
The maximum allowable pressure of the propane system is __________ inches water column.
14
Engine coolant must reach approximately ____________ psi pressure before it can flow into the recovery bottle.
15
Determine the gallon capacity of a 65-lb ASME tank at 60 degrees F (16 degrees C)
15.5 US gallons 12.7 imperial gallons full 12.38 12.4 gallons at 80 percent full level. Propane weighs 4.20 lb per gallon at 60 degrees For 5.1 lb per imperial gallon at 15.5 degrees C. Divide 65 lb capacity of ASME tank by 4.20 propane weight per gallon = 15.476 rounded to 15.5 multiplied by 0.8 = 12.38
Calculate the wattage for a 120 VAC, 1.5 A computer monitor.
180 W, 120 VAC multiplied by 1.5 A
Calculate the amperage of a 120 VAC, 300 W refrigerator.
2.58, 300 W divided by 120 VAC
A 200 A-H rated deep cycle battery can supply 10 A for __________ hr at 72 degrees F.
20
When using an air gun to flush the cooling system make sure the gun is adjusted to _____________.
20 psi MAXIMUM
A proper mixture of engine coolant raises the boiling temperature of the coolant to ____________ degrees F.
230 degree
When four 6-volt, 200 A batteries are connected in series the output is ______________.
24-volt, 200 A
Correct purging procedures require a minimum of ____________ feet (meters) clearance from any source of ignition.
257.6
NFPA 1192 requires that a times pressure drop test be conducted for a minimum of ___________ minutes.
3
The proper setting for a pressure relief valve on a ASME tank is ___________ psi.
312.5
The pressure setting for a pressure relief valve for a DOT cylinder, 40 lb (18.1 kg) capacity or smaller, is ___________ psig.
375
When sanitizing the freshwater system, allow the system to stand for at least ___________ hours when disinfecting the 50-ppm residual chlorine.
4
The typical water pressure created by a demand water pump is ____________ psi.
40
What should be the resistance of a 120 VAC heating element for a 300 W, 120 VAC refrigerator.
48-3/4 10 percent
When hanging piping in the drainage system, support the piping every _______________ feet (centimeters)
4ft (121.9)
Copper tubing should be supported every __________ to prevent physical damage from vibration.
4ft 1.2 m
______________ milliamps is sufficient AC current to cause painful shock.
5
When four 6-volt, 200 A batteries are connected in parallel, the output is __________.
6-volt, 800 A
The term 60 Hz means that an AC powerline frequency cycle occurs ____________.
60 times every second
A reading of zero resistance indicated a/an _____________.
Short
During the times pressure drop test, the pressure must be maintained at a nominal ____________ or less WC for the minimum time frame.
8 inches
A properly sized and installed dip tube will extend into a propane container to the ____________ level.
80 percent full level
Never remove a radiator filler cap from a radiator when the engine is running.
True
Explain the purpose of a P-trap.
A P-trap provides a water seal preventing gases from escaping into the RV
Filter
A device designed to remove impurities from the water
Accumulator
A device that decreases water pulsation and the rapid on-off pump operation
Regulator
A device that protects the water pump and other components from excessive water pressure
High-pressure check valve
A device that, when located at the pump outlet, protects the pump from excessive water pressure and, when located at the water heater inlet, prevents backflow of hot water into the cold water system
Explain the purpose of a vacuum breaker.
A device to provide backflow protection, preventing siphoning of potentially contaminated water into the freshwater supply
Pressure guage
A device used when performing a leak test of the water distribution system
Viscosity
A measurement of the fluidity of a liquid
Multimeter
A volt ohm, anmeter
The circuit breaker amperage rating with the minimum wiring requirements:
A.) 20 A- 12 gauge wire B.) 30 A- 10 gauge wire
List the two things required for an RV water distribution system.
A.) A source of freshwater B.) A means of providing pressure
What type of tests could the technician perform on the water distribution system?
A.) Air pressure test B.) Demand system test
When replacing a damaged power supply chord on an RV.
A.) Always replace it with one of equal capacity B.) Always ensure that the power supply chord is listed for RV use C.) Always ensure that the power supply chord has a molded end where it attaches to the RV park pedestal D.) Never substitute extension chord type materials for a listed RV power supply chord
The three wires used in 120 VAC lines are: A.) Black = ___________ B.) White = __________ C.) Bare or Green = ___________
A.) Black = Hot B.) White = Neutral C.) Bare of Green = Ground
List the three types of system checks performed on the RV waste drainage systems.
A.) Black water system flood test B.) Gray water system flood test C.) Flow test
List the two methods that can be used to determine the amount of propane to be added to a container when filling.
A.) By weight B.) By container volume
List the four types of water systems used in RVs.
A.) City water pressure B.) Demand pump pressure system C.) Manual pump system (creates own pressure) D.) Air pressurized system
Preventive maintenance requirements for RV air conditioners is limited to:
A.) Clean or replace filters B.) Inspect and clean evaporator C.) Inspect and clean condenser assemblies
List the two methods a technician can use to locate a leak.
A.) Electronic leak detector B.) Leak detector solution
List the three manufacturing methods for PEX piping.
A.) Engel method (Type A) B.) Silane method (Type B) C.) Radiation method (Type C)
List the two characteristics of direct current.
A.) Fixed of Applied Volt B.) Flows in one direction
The two types of flare nuts approved for use in RVs are?
A.) Forged B.)Stress-relieved
List three factors that can increase tire pressure by 10 psi.
A.) Heavy loads B.) High-speed driving C.) High road-surface temperatures
What is required in a RV that has a 30 A power supply assembly and more than 2 thermostatically controlled 120 VAC appliances?
A.) Isolation switch B.) Energy management system
List things a technician needs to know or to be able to do to become efficient at troubleshooting electrical system.
A.) Know ohm's law and how and when to use it B.) Know how to use electrical test equipment C.) Read and understand electrical diagrams and schematics D.) Have and know how to use the correct tools and equipment for a specific task E.) Use available documentation and reference materials
Which symptom(s) of a regulator would require its replacement?
A.) Leaking at a very small vent hole near the spring tower B.) Leaking around the crimped area
List the three types of power converters.
A.) Linear B.) Ferro Resonant C.) Switch mode
List the three methods of switching between AC sources.
A.) Manual plug in B.) Manual transfer switch C.) Automatic relay
List the four types of toilets used in RVs.
A.) Mechanical seal B.) House-type flush C.) Recirculating toilets D.) Portable toilets
List four advantages the gel-cell battery has over the liquid acid battery.
A.) No need to check water B.) Cannot sulfate C.) Can be stored two years D.) Can be charged after dead for 30 days
Obvious things a technician should look for when troubleshooting an electrical system.
A.) Open wires B.) Shorted wires C.) Dirty or bad connections D.) Grounded wires or connections to skin or frame E.) Loose or corroded ground connections F.) Broken or cracked components G.) Overheated wires or connections H.) Poor work done previously I.) Incorrect wire size J.) Too many devices on a circuit
List the three types of drawings a technician must be familiar with.
A.) Pictorial drawings B.) Ladder diagrams C.) Schematics
List two approved materials for joining pipe connections
A.) Pipe joint compound marked for propane use B.) Teflon tape approved for propane use
List the five major components of a water distribution system.
A.) Piping system B.) Freshwater storage tank C.) Water heater D.) Water pump E.) Faucets
List the three possible sources of AC power to an RV.
A.) Power supply cord B.) Onboard generator C.) Inverter
List at least three other functions the technician should perform as routine preventive maintenance on the propane system.
A.) Regulator adjustment as necessary B.) Leak testing the regulator C.) Leak testing the piping system
Preventive maintenance on smoke detectors consists of:
A.) Replacing the battery annually or more often as needed B.) Testing by depressing the test button on the face of the detector C.) Once a month gently vacuuming or dusting the face of the cover
What are the two most common faults found with a 120 VAC system?
A.) Short B.) Open
When connecting 120 VAC wiring to an outlet terminal the: A.) White wires connected to ___________ B.) Black is connected to __________ C.) Bare of Green is connected to ___________
A.) Silver terminal, wide prong or slot B.) Brass terminal C.) The green screw
List the two ways that an RV coach electrical system and the vehicle electrical system can be interconnected.
A.) Solenoid relay B.) Dual battery isolators
List the two purposes of an RV plumbing system.
A.) To supply potable water (both hot and cold) B.) To provide a means of disposing of wastewater used at each fixture in a sanitary manner
Special 120 VAC safety precautions to which a technicians should always adhere.
A.) Turn off the power to circuits when working on the 120 VAC system B.) Always use insulated tools when working on or near circuits that are energized C.) Keep one hand behind your back when probing live circuits or working on a plugged distribution panel board D.) Work in a dry area and always wear proper insulated footwear E.) Check meter and test equipment test leads for defects prior to using F.) Always hold test leads by the insulating sleeves
Technician should answer after completing repairs on electrical system.
A.) Was polarity observed when making wire and cable connections? B.) Were any cables or wires pinched while working on the system? C.) Were all cables and wires secured away from any heat source? D.) Were the correct connecters used? E.) Were all connections clean and tight? F.) Are all solder connections made properly? G.) Were any wires burned while soldering? H.) Did any solder fall into other areas of the system? I.) Was the the correct specification for measurements and values? J.) Were all parts reinstalled properly? K.) Was the area working in left clean? L.) Satisfied with work?
List the two types of faucets used in RVs.
A.) Washerless faucets B.) Compression faucets
List the three situations that would make sanitizations of the freshwater system necessary.
A.) When the RV is first put into service B.) Anytime the RV has not been used for a ling period of time C.) When contamination is suspected (Never assume contamination has not occurred, suspicion is enough to warrant sanitization)
List symptoms of overfill
A.) When the outage valve is opened, there is a stream of liquid B.) If there is a continuous draw of liquid into the regulator C.) Any signs of oily material or an abnormal amount of dirt that might be stuck to the exterior of the regulator D.) There may be a residual odorant from around the relief valve area E.) Missing dustcover and shinny brass
List the four 12 VDC power sources that can be found on RVs.
A.)Batteries B.)Converters C.)Solar Panel D.)Alternator
List the two methods of locating leaks in RVs.
A.)Leak detector solution B.) Electronic tester
When cleaning a furnace pilot orifice, it is recommended that the orifice be soaked in a solution of ___________.
Acetone
Detergent
Additive that cleans engine parts
Load Tester
Allows technician to apply a varying load to a battery
The _____________ is used to keep batteries charged and to provide necessary 12 VDC power when driving on the road.
Alternator
_______________ is the same with 12 VDC as it is with 120 VAC.
Ampacitiy
Dispersant
An additive that keeps dirt suspended in the oil
Cleaning the interior of the water tank of a hot water heater should be done by __________.
Backflushing
Explain how the RV plumbing system is different from that found in a house.
Both the water distribution and wastewater systems are usually self-contained in that the RV has both an onboard source of water and an onboard means for storage for waste
Use a POL plug in a ______________ valve.
CGA 510
Which of the following conditions could indicate the necessity for bearing, race, or seal replacement?
Cage wear Roller wear Smears Galling
What is the major advantage of a deep-cycle battery?
Can handle being charged/discharged more
A major concern when adding accessories to a circuit is to determine that the circuit will have sufficient current to take care of the increase ___________.
Capacity, load
Incomplete combustion by-products are soot and __________.
Carbon Monoxide
When checking tire tread wear, examine the ___________ tread in ___________ locations to give an overall reading.
Center groove; three different
A customer complains that all of the appliances work but not at normal efficiency. Based on the symptoms, it is determined that the problem is probably low pressure. The first thing to do is?
Check operation of the service valve
A _____________ must be located at any city water service connection if the water distribution system has a non-pressurized water tank and is connected to city water.
Check valve
Synthetic Oil
Chemically produced motor oil
Additives
Chemicals added to motor oils to improve their performance
Tire pressures are most accurate if checked when the tire is __________.
Cold
Diode
Converts AC to DC
When refilling the system add the ___________ before adding water.
Correct amount of antifreeze
As troubleshooting time ____________ profits ____________.
Decreases; increases
Devices used to help direct the flow of electricity in a circuit are called _________.
Diodes
An inverter converts _____________ to ____________.
Direct current (DC); alternating current (AC)
NFPA 1192 requires that the regulator's vent must be pointing ___________ or within ___________ pf this vertical plane when installed.
Directly to the ground; within 45 degree
DWV stands for?
Drain, waste, vent
The type of battery used to power a flashlight is called a
Dry Cell
When dumping wastewater at an appropriate dump station, always:
Dump the black water holding tank first, and then the gray water holding tank
A dry cell battery is actually dry.
False
The proper mixture of engine coolant is 50% water and 50% _________.
Ethylene glycol
The __________ will severely restrict the propane flow when a propane line ahead of a regulator is broken or opened.
Excess flow valve
Type 3 circuit breaker
External reset button
As a general practice, when using a wire nut for splicing, twist the wire strands together prior to putting the wire nut on.
False ( Do not twist the wires together. Simply strip the two wires to an equal length and then attach the wire nut. The wire nut twist the wires together while making a good connection.)
Higher gauge numbers indicate the thicker wire sizes.
False ( Higher gauge number indicate thinner wire sizes.)
The amount of voltage drop that will occur within a wire decreases as the copper area decreases.
False ( The amount of voltage drop that will occur within a wire decreases as the copper area increases.)
The closed position on a switch is the OFF position.
False (Closed is ON position)
When working on a battery, always disconnect the negative first and reconnect the negative first.
False (Disconnect negative first and reconnect negative LAST.)
Electrolyte is not a safety hazard, because it is diluted with water.
False (Electrolyte is sulfuric acid and diluted by water and will cause injury or damage if it comes into contact with eyes, skin, clothing, etc.)
The open position on a switch is the ON position.
False (Open is OFF position)
When connecting batteries in series, connect the positive terminal to positive terminal and negative terminal to negative terminal.
False (Series is positive to negative. Parallel is positive to positive and negative to negative.)
As a rule of thumb, a properly adjusted belt should have 3/8 to 1/4 in. deflection when 25 lb. of force is applied to the belt.
False- 1/8 to 3/8 in.
The engine must be off for at least ten minutes and parked on a level surface before an accurate oil check can be made.
False- 3 minutes on a level surface
Wastewater level sensors cannot be cleaned and must be replaced whenever they become coated and no longer function properly.
False- consult the manufacturer instructions for proper servicing procedure
A polarity test is used to ensure that all metallic parts of an RV that could be energized are bonded.
False- continuity test
Manufacturers use a different transmission fluids. However, they are all compatible.
False- different transmission fluids NOT COMPATIBLE
Glazing is a process of applying the correct amount of lubrication to a belt.
False- glazing is the hardening of the under surface of the belt, caused by heat, due to improper belt tensions
The proper operating test for a fire extinguisher is to partially discharge it to verify pressure.
False- never partially discharge a fire extinguisher to test it
The available voltage of a battery can be determined by conducting a closed-circuit voltage test.
False- open circuit voltage test
Engine coolant level should be checked when the engine is hot.
False- should be checked when the engine is cold
Electrolyte is a combination of sulfuric acid and petroleum jelly.
False- sulfuric acid and distilled water
Specific gravity is measured using a manometer.
False- temperature compensated hydrometer
Tires should be rotated every 5,000 miles.
False- the rule of thumb is every 6,000 to 8,000 miles, but this will vary based on manufacturer and type of tire (steel, steel-belted radial, ply, etc.) always check the owner's manual for the rotation sequence and interval
Drain valves and toilet seals should not be lubricated.
False- they should be lubricated to ensure ease of operation, however, special drain valve lubricant should be used
The red LED is flashing every 30 to 50 seconds on the carbon monoxide detector. This means that the carbon monoxide levels inside the RV are above the safe level.
False- this means the detector is working properly, the warning of carbon monoxide buildup is a continuous beeping and flashing of the red LED
Copper may never be used for RV water distribution systems.
False. Copper tubing may be used. It can sometimes be found in older RVs or high-end Rvs
Draining the water system is an acceptable way of winterizing the RV.
False. Draining of a water system is not adequate to be sure that there will be no problems with freezing and bursting of lines, pipes, or components. The pump, toilet valve, and city water inlet do not drain
The type of material is not marked on fittings.
False. Fittings have the information embossed into the plastic, normally on the body of the fitting away from the hubs
Nontoxic antifreeze only comes in one grade.
False. It comes in two grades that are rated for different temperature ranges
Is the type of plastic pope normally used in RV drainage systems is called PVC (polyvinyl chloride)?
False. It is called ABS (acrylonitrile-butadiene-styrene) PVC is used in the housing industry
The number of threads in a threaded pipe does not affect performance.
False. Over threading can cause loose fitting and weakening of pipe.
PVC piping may never be used for RV drainage system piping.
False. PVC can be used for RV drainage systems by seldom is because the material is more brittle in cold weather. Portions of the RV drainage system are exposed to outside weather conditions
Pressure relief valves are adjusted by the technician as part of the leak test.
False. Pressure relief valves are adjusted by service personnel.
Propane and water boil at -44 degrees F (-42 degrees C) at sea level.
False. Propane does, water boils at 212 degrees F (100 degrees C)
Propane contracts as temperature is raised.
False. Propane expands as temperature is warmed, 1 1/2 percent for every 10 degrees F (-12.2 degrees C)
A gallon of propane weighs 10 lb, 2 oz (4.6 kg) at 60 degrees F (16 degrees C)
False. Propane weighs 4.2 lb (1.9 kg) per gallon at 60 degrees F (15.6 degrees C)
Rigid piping is connected/assembled using the crimp method.
False. Rigid piping, such as CPVC, is assembled using plastic pipe solvent. Crimping may be used on such piping as copper tubing and PB
Sealants are used on both the male and female threads of a connection.
False. Sealants are only applied to the male threads
Proximity of the water pump to the storage tank is immaterial to its operation.
False. The closer to the storage tank, the better. Distance can cause the water pump can cause "starvation" of water supply
The electrical wire gauge used in installing a water pump remains constant regardless of the length of the line.
False. The gauge will change as the length of the line increases ; 14 ga up to 20 ft (6 m) 12 ga from 20 to 50 ft (6 to 15.24 m), and 10 ga over 50 ft (15.25 m)
Check for leaks on propane systems only once each year.
False. The system should be tested t least once before each camping season and anytime the system is opened by loosening a fitting, removing an appliance, replacing a line, or leak is suspected.
Any type of thread lubricants may be used.
False. Thread lubricant has the same requirements as pipe joint compound and must be identified as being acceptable for use with potable water
Purging is necessary only when placing a new propane container into service.
False. Used containers that have had their service valve left open also need to be purged.
Freshwater storage tanks are exempted from the requirement to be vented.
False. Venting of fresh storage tanks is required to allow air to escape during filling
Water pumps can "pull" better than they can "push".
False. Water pumps can "push" better than they can "pull"
Water pumps should never be mounted on wood.
False. water pumps should be mounted on wood, as wood damps the noise of operation. Mounting on metal increases the probability of increased noise and vibration
The power converter whose output will not vary when the input changes is called a ____________.
Ferro Resonant
Holes or cracks in sinks, tubs, and showers are usually repaired using the ____________ method.
Fiberglass patch
When cleaning the end of the thermocouple on a pilot model furnace, _________ should be used.
Fine steel wool
What type of test requires that the entire drainage system, including the holding tanks, are filled until water appears at the bottom of the lowest fixture on each system?
Fixture flood test
What type of test requires that each fixture drain be opened and water level visually observed?
Flow test
All exterior receptacles must be ____________ protected.
GFCI ( Ground Fault Circuit Interrupter)
The process that causes explosive hydrogen gas to be produced by the battery is called ____________.
Gassing
A/an ______________ can be used to quickly determine whether a receptacle is wired properly.
Ground monitor ( Polarity Test)
Explain the purpose of a ground.
Grounding electrical equipment and circuits provides lower resistance path to ground than a human being, thereby protecting the human from shock in the event of a fault circuit.
Which of the following is NOT a propane container "appurtenance?"
High-pressured pigtail
Batteries are connected in parallel to provide higher ______________.
Higher current capacity (amperage)
Batteries are connected in series to provide higher ____________.
Higher voltage
Which of the following electrical tests should be conducted on every RV that is having service to the electrical system.
Hot skin test
What is required to avoid having to fill the entire water heater with antifreeze?
Hot water tank bypass kit
Non-demand electric water pumps are of the _____________ design.
Impeller
Black soot at the furnace outside exhaust vent is an indication of possible _________.
Incomplete combustion, which can be caused by an obstruction in the air intake vent or main burner
A switch is being checked. The switch has been isolated from the circuit. An ohmmeter has been placed across the switch contacts. When the switch is open, the meter should read ____________. When the switch is closed, the meter should read _____________.
Infinity; Zero resistance
RVs have the neutral circuit ____________ so that reverse polarity within the RV cannot cause the skin of the RV to be energized.
Isolated from ground
What is the most common type of wet cell battery used in RVs?
LED Acid
The power converter whose output will vary when the input changes is called a ____________.
Linear
The following conditions can cause abnormal tire wear.
Misalignment Bent wheels Worn bushings Sprung axle housings Underinflation Improper camber Faulty or grabbing brakes Over inflation Overweight vehicle Improper weight distribution
Multigrade
Motor oil providing lubrication over a broad temperature range
Devices that convert electrical energy into rotary mechanical energy are called?
Motors
To test for proper AC voltage at each outlet, a ____________ would be used.
Multimeter
Identify the document that establishes the plumbing requirements for RVs.
NFPA 1192 Standard for Recreational Vehicles
Proper purging procedures are contained in?
NPGA Safety Bulletin
The wider blade of an AC plug will only fit into the slot connected to the _____________ side of a correctly wiring receptacle.
Neutral
Is the piping from the three manufacturing methods compatible with the others?
No. When replacing PEX piping, make sure that the PEX material to be used is a type compatible with another type if being mixed
Pinhole leaks can usually be detected by the ____________ that forms after the container has been in use for a while.
Oily spot
The length of a dip tube can be found?
On the cylinder guard
A loose or broken wire or a bad connection will cause a/an ___________.
Open
A reading of infinity indicates a/an ____________.
Open
SAE
Organizations that grades motor oil viscosity
Abnormal wear on the center tread of a tire is an indication of ____________.
Overinflation
Whenever transporting or storing disconnected propane containers, always use a ___________.
POL plug or dust cap
What is not a type of plastic piping used for RV water distribution systems?
PTRV
120 VAC circuits are wired in ___________. Because of this the power is fed to each device ________.
Parallel; Sequentially
A sketch of the actual components and wiring is called a ____________.
Pictorial drawing
_______________ should be used when cleaning the electrical contacts on a wall thermostat.
Plain, dry paper
Which of the following materials is not approved for use as propane piping?
Plastic
The following steps have been taking when replacing an appliance.
Plug the propane line with a brass cap
Some cleaners can cause burns and are _____________.
Poisonous
Whenever a receptacle has been rewired or replaced, check the ___________ using a ___________.
Polarity; polarity tester
Underinflated tires can cause ___________.
Poor steering Abnormal tread wear Early tire failure Increased fuel consumption
Isolater
Prevents tow-vehicle battery discharge
What is the following function of a check valve?
Prevents water from back-flowing into the pump or storage tank
To chemically clean battery terminal, use ____________.
Regular baking soda
Automatic switches with contacts that can be closed or open by current in a coil are called ______________.
Relays
Oil Filter
Removes dirt from motor oil
The typical schedule size for ABS DWV piping used in RVs is?
Schedule 40 or equivalent
The type of drawing that is used most frequently is ___________ drawing.
Schematic drawing
Flush the heater core, the radiator, and the engine ____________.
Separately
Ladder diagrams are more appropriate when a circuit is ____________ in nature.
Sequential
Which of the following valves is the primary valve on a DOT/TC cylinder?
Service valve
A hot skin test is an electrical test of the RV that determines that the vehicle has a/an ______________.
Short
A _____________ produces a "jump start" of buildup current that supplies enough momentary overpower to force a motor to start against a load.
Start capacitator
The power converter whose output will not vary when the input changes, and which provides such a dense and fast output that it seems solid to the connected load, is called a ____________.
Switch Mode
Which of the following is a valid reason for NOT putting antifreeze into a water heater.
The antifreeze will disintegrate the anode nod
Piping size required to connect the potable water supply to the distribution system is determined by ____________.
The number of fixtures
DWV piping is sized b?
The wall thickness of the pipe
What is the most probable cause of a water pump periodically running (cycling) when all fixtures are turned off?
There is a water leak in the system
A reading on the voltmeter during a properly conducted hot skin test indicates _____________.
There is an electrical short
When flushing the cooling system, remove the ___________.
Thermostat
Never bleed or reduce air pressure when a tire is hot.
True
How many types of plumbing system tanks are usually found on an RV?
Three. Freshwater storage tank, liquid waste holding tank (gray water), and body (solid) waste holding tank (black water). A single holding tank sometimes may be used to store both liquid waste and body waste
A POL nut has a left-hand thread.
True
A battery that tests 11.7 V or lower is considered to be fully discharged.
True
A long wire offers more resistance to current flow than a short wire.
True
ASME tanks are usually bolted to the RV's frame or floor.
True
According to the NFPA document, every fixture in the drainage system and every holding tank is required to be vented.
True
All conductors that pass through bulk heads to the outside elements must be wearing weather proof and sealed.
True
Always use a second (backup) wrench when opening or closing propane fittings.
True
Anytime a 120 VAC conductor is routed on the vehicle exterior, it must be inside a listed conduit.
True
Bolt strength is often indicated by markings on the head of the bolt.
True
Brake fluid is corrosive and will burn the skin.
True
Bulges in hoses can be caused by overtightening clamps or by oil getting on the the hose.
True
Chlorine is poisonous and must be handled with care.
True
Circuit polarity should be tested daily or any time the vehicle is attached to a shoreline power source.
True
Combination battery/converter circuits are the most common and versatile 12 VDC circuits in RVs.
True
Do not mix lithium, calcium, sodium, or barium complex greases due to possible incompatibility problems.
True
Ethyl mercaptan is added to the propane as a warning agent.
True
Every time the propane system is opened by loosening a fitting, removing an appliance, or replacing a line, or when a leak is suspected, the system must be tested for leaks by pressurizing the system and conducting a pressure drop test.
True
Face shield, rubber gloves, and aprons should always be worn when working with batteries.
True
Failure to back off the castle nut could cause bearing and axle spindle damage.
True
Flare fittings are designed to be used without any sealant material.
True
Gauge numbers specify the size of round wires in terms of diameter and cross-sectional area of the copper in the wire.
True
High resistance shorts do not cause breakers to trip or fuses to blow.
True
Highly flammable hydrogen gas is present in battery cells.
True
Hoses that must contact engine parts must be securely clamped or protected.
True
Inspection of belts should cover three areas: tensions, belt condition, and pulley alignment.
True
LP-gas is a petroleum product separated out of natural gas and crude oil in the refining process.
True
Light-emitting diodes (LED) and liquid-crystal display (LCDs) are examples of semiconductors .
True
Most water pumps are mounted horizontally.
True
Never add water to a hot engine unless the engine is running.
True
Propane containers need to be secured to the RV so they will not become dislodged when a load equal to eight times the container's filled weight is applied to the filled container's center of gravity in any direction.
True
Propane system tests should only be performed by a trained RV service technician.
True
Sealants should never be used on flare fittings, compression fittings, and compression rings.
True
Since some manufacturers recommend checking power steering fluid when it is cold and others recommend checking it when hot, always check the owner's manual for the correct procedures.
True
Solenoids/relays are used to open or close circuits.
True
Solid-state is a term that pertains to circuits and components using semiconductors.
True
Teflon tape is approved for use in water systems.
True
Testing the propane system should be conducted at the start of each camping season or at least once a year.
True
The amount of current a wire will carry increases as the area of copper increases.
True
The conductor and overcurrent protection must always be equal to or larger than the minimum load rating of the device.
True
The type of material is printed along the length of the pipe.
True
Tire pressure should always be checked cold.
True
Use of a battery charger as a converter is not recommended because of high voltage.
True
Voltage drop is always present when current is passed through a diode.
True
Water pumps work better if they are mounted at the same level as the bottom of the storage tank.
True
When installing or servicing low-voltage devices, it is necessary to determine the amperage of the device.
True
Is the color of the piping used in RV drainage systems usually black?
True. However it can be white
Propane, as extracted, is nearly odorless and colorless.
True. The odorant ethyl mercaptan is added to natural propane.
Lubricate and Sealing
Two functions of motor oil
Abnormal tread wear on the outside of a tire is an indication of __________.
Underinflation
When splicing a 120 VAC wire, always _____________.
Use a junction box
