問題一覧
1
If an appliance is rated at 30,000 btu/hour, how many approximate hours per gallon will that appliance operate if it is running continuously..??
3 hours
2
A 20lb cylinder is 20% full at -10degrees. What is the approximate btu vaporization rate per hour??
5,400
3
As the ambient temperature decreases, the rate of vaporization…..????
decreases
4
The total rate of vaporization of propane is determined by which two factors?
a temperature of the LP and the amount of surface area wetted by the propane
5
During winter travel, a customer states that the cooktop burner ignites but the furnace will not ignite. Which of the following is NOT a logical reason for this situation???
propane container overfilled
6
The lower the propane fuel level, the -BLANK- the wetted surface and the -BLANK- the vaporization rate
less, lower
7
The science that deals with the relations between heat and forms of energy is called…?
thermodynamics
8
Boyle’s law explains with certainty that the -BLANK- and -BLANK- are inversely proportional to one another..?
pressure, volume
9
Where does the pressure in a propane container originate??
absorbed heat from the surrounding air temperature
10
A can of liquified gas (such as compressed air, refrigerant) turned upsides down will release…?
pressure and liquid
11
When testing the automatic changeover regulator mechanic function, which of the following is NOT required???
have one pigtail disconnected from the cylinder valves
12
The first stage of a two stage regulator is preset at approximately???
10 psi
13
A high pressure propane pigtail is connected between which two components??
the cylinder and the automatic changeover mechanism
14
The second stage vent of the regulator must be positioned…?
downward within 45 degrees of the vertical plane
15
A regulator must have a rated capacity equal to or greater than the total btu/hr input of..??
all appliances
16
If the flame lifts off burner, and extinguishes, what is the cause..?
gas pressure too high
17
According to NFPA 1192, regulators are required to -BLANK- when installed above vehicles floor line??
be under protective covers
18
The purpose of a regulator cover is to do all of the following EXCEPT??
reduce the internal pressure of the propane
19
The following is a picture of??
backflow check valve
20
Which of the following are the gas lines between the propane cylinders and the regulator??
high pressure connectors
21
If the customer complains about low or no pressure, the technician should???
open the container valve
22
When troubleshooting a low or no propane pressure, the regulator should be..?
warmed to room temperature
23
To locate the leak, the technician should
spray every fitting with soapy solution
24
The following picture is a???
propane test device
25
Which of the following is NOT a cause of a regulator leaking propane??
defective excess flow valve
26
The interval lever arm assembly in a regulator is controlled by??
pressure spring assembly
27
Up and manometer fluctuations may indicate that??
the regulator is receiving liquid propane
28
To accurately diagnose regulator equipment failures, the temperature…?
of the air and piping must be the same
29
Best practice dictates that the only component that can be replaced on a regulator is…???
the dust cap
30
A regulator locking up over 14” of w.c would..?
need to be replaced
31
Which of the following is an approved method for emptying a propane tank?
burn off the gas with a suitable torch
32
When torching off a container the internal pressure is ultimately reduced to..?
atmospheric pressure
33
If the service valve is closed but continues to allow propane vapor to escaped the technician should…??
replace the service valve
34
Which is an indication of a faulty fixed maximum liquid level gauge (outage gauge)..??
possible overfilling of a container
35
A dislodged magnet in the float assembly inside the container would cause…??
inaccurate level monitoring
36
A dislodged magnet in the float assembly inside the container would cause..?
inaccurate level monitoring
37
A customer complains that the monitor panel level does not match the sight gauge on the tank. The most logical cause would be…???
mis-matched resistance specifications between the sending unit and remote gauge
38
What appurtenance has a triangle shaped handle?
type 1 OPD
39
Difficult in filling an ASME tank with a float type OPD that is non-restricted may result in…???
OPD stopping the fill process pre-maturely
40
Technician A says that RV tanks must be recertified. Technician B says that used RV tanks must be destroyed. Which technician is correct????
neither technician is correct
41
The following pigtail is rated at..??
200,000 btu/hr
42
The following pigtail is rated at…????
400,000 btu/hr
43
After replacing an appurtenance on an empty container, test for leaks by all of the following EXCEPT????
use water pressure
44
When leak testing a container, use a solution that containes a mixture of..??
water and soap
45
After a leak testing a propane container with a replaced appurtenance function test that appurtenance in which order…?? 1. Perform test 2. Purge 3. Fill container 4. Place container back into the service 5. Document the results
2,3,4,1,5
46
A customer complains of erratic operation of all appliances after a propane container appurtenance was replaced. The most likely cause is …???
improper purging process
47
Copper tubing used in a RV is permanently marked along its length with its type designation. What type of copper tubing must be used in an RVs propane system??
annealed type K or L
48
What type of propane lines are suitable for use under a trailer
black iron pipe
49
Which of the following copper flares indicates an offset flare?
b
50
When pipe joints are assembled, pipe joint compound is…??
to be applied to male thread only
51
Which type of fitting needs pipe sealant when connecting????
pipe thread
52
Compression fittings can…??
never be used in an RV propane system
53
What are the criteria for sizing the propane piping system in an RV???
total demand and length
54
Which reference would you use to search for piping routing and protection
NFPA 1192
55
In general, all propane piping shall be secured and supported in place at intervals not more than…???
4” apart
56
What is the result when a container exceeds the rate of vaporization
little or no propane flow
57
To resolve container refrigeration..??
fill the propane container
58
If the system has oil contamination, the power method to removing the contamination is by…??
flushing with denatured alcohol
59
What is the main reason for the taper on a pipe thread???
insure a progressively tighter fit
60
The odor of propane leak resembles…???
rotten eggs
61
LP detector can diagnose ???
carbon monoxide
62
The reason it is important to record the work performed after repairing a propane line is…???
to protect against potential lawsuits
63
Which of the following is NOT required on a propane documentation after a repair???
propane tank level
64
Reaming on the inside of the tube prevents…???
prevents burrs and other imperfections during the flaring process
65
What type of flare nut is not suitable for use in RV propane system???
forged brass
66
Properly adjusted tubing in the holder for flaring tubing would be..???
1/8 above the top of the clamping tool
67
Propane tubing joints are permitted to be single or double flared. The degree of the flare, according to SAE J533 must be..??
45