Achr230 Final Review

85 Questions  I  By Azortex
ACHR230 Final Review.   Multiple Choice, T/F, & Fill-in the blank.

  
Changes are done, please start the quiz.


Question Excerpt

Removing question excerpt is a premium feature

Upgrade and get a lot more done!
1.  When moisture is present in a refrigeration system, it will react with the refrigerant and the oil to form ________.
A.
B.
C.
D.
2.  Which of the following represents the lowest vacuum?
A.
B.
C.
D.
3.  To pull a vacuum means to ________.
A.
B.
C.
D.
4.  A compound gauge ________.
A.
B.
C.
D.
5.  A micron gauge is used to measure
A.
B.
C.
D.
6.  The best method of leak checking is when the refrigeration system is ________.
A.
B.
C.
D.
7.  Noncondensable gases ________.
A.
B.
C.
D.
8.  What is the most accurate instrument for checking a deep vacuum?
A.
B.
C.
D.
9.  To insure accurate testing, the best material to use for connecting lines to the vacuum pump and gauge set is ________.
A.
B.
C.
D.
10.  A multiple evacuation means that ________.
A.
B.
C.
D.
11.  Moisture in a liquid state must be ________ before it can be removed with a vacuum pump.
A.
B.
C.
D.
12.  How many chlorine atoms does it take to destroy 100,000 ozone molecules in the stratosphere?
A.
B.
C.
D.
13.  Which of the following refrigerants is a CFC-type refrigerant?
A.
B.
C.
D.
14.  Which of the following is an example of an HCFC refrigerant?
A.
B.
C.
D.
15.  Which of the following refrigerants is considered an HFC-type of refrigerant?
A.
B.
C.
D.
16.  Which type of refrigerant has the highest Ozone Depletion Potential (ODP)?
A.
B.
C.
D.
17.  What effect is ozone depletion having on the environment?
A.
B.
C.
D.
18.  The abbreviation for refrigerants containing chlorine, fluorine, and carbon is ________.
A.
B.
C.
D.
19.  The abbreviation for refrigerants containing chlorine, fluorine, carbon, and hydrogen is ________.
A.
B.
C.
D.
20.  The abbreviation for refrigerants containing fluorine, carbon, and hydrogen is ________.
A.
B.
C.
D.
21.  To reprocess refrigerant to meet new product specifications is called ________.
A.
B.
C.
D.
22.  To clean refrigerant by the use of filter dryers is called 
A.
B.
C.
D.
23.  To remove the refrigerant from a system without any testing or processing and to be put back into the same system is called ________.
A.
B.
C.
D.
24.  Refrigerants that are made up of two refrigerants that, when blended in the right proportions, combine to make a third stable refrigerant, are called ________.
A.
B.
C.
D.
25.  The ozone depletion factor of R-12 is ________.
A.
B.
C.
D.
26.  If a critically charged refrigeration system is over charged, which of the following is a likely result?
A.
B.
C.
D.
27.  Fractionation occurs when ________.
A.
B.
C.
D.
28.  When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system?
A.
B.
C.
D.
29.  Charging a refrigeration system refers to ________.
A.
B.
C.
D.
30.  If 22 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 24 lb. 12 oz. before any is added, what will be the supply cylinder weight after the system has been charged?
A.
B.
C.
D.
31.  If 30 oz. of refrigerants are to be added to a refrigeration system and the supply cylinder weighs 26 lb. 4 oz. before any is added, what will the supply cylinder weigh after the system has been charged?
A.
B.
C.
D.
32.  Refrigerant in liquid form is normally put into a system through the ________.
A.
B.
C.
D.
33.  Refrigerant in vapor from is normally put into the system through the ________.
A.
B.
C.
D.
34.  When charging a system with vapor refrigerant from a refrigerant cylinder the cylinder will become ________.
A.
B.
C.
35.  When charging liquid refrigerant from a single valve supply cylinder, the cylinder is placed ________.
A.
B.
C.
D.
36.  A graduated cylinder charging device is a device that ________.
A.
B.
C.
D.
37.  The factory charge in a split system, using R-22, shows 6 lb. 8 oz. in the outdoor condensing unit and 2 oz. in the evaporator.  The 3/8" liquid line contains 0.48 oz. per foot and the 7/8 " suction line contains 0.10 oz. per foot.  The refrigerant lines are 30" long.  What is the correct refrigerant charge for this system?
A.
B.
C.
D.
38.  After repairing a system that has had an electrical motor failure (compressor burnout), it is a good field practice to re-use the recovered refrigerant in that system.
A.
B.
39.  Air entering a refrigerant system can eventually lead to compressor failure.
A.
B.
40.  Clearance tolerances are such that the ordinary clean refrigerant oil can be used satisfactorily in a vacuum pump.
A.
B.
41.  While under a deep vacuum, any liquid water under the oil in the motor-compressor assembly can be removed by operating the compressor motor for  several seconds without any adverse effect on the system.
A.
B.
42.  The maximum recommended pressure for leak testing is 150 psig.
A.
B.
43.  The oil in a vacuum pump should be changed after each time it is used.
A.
B.
44.  It is possible to have a leak-free system when under a vacuum but still leak when the system pressure is above atmospheric.
A.
B.
45.  Refrigerants that have a low Ozone Depletion Potential (ODP) will, in turn, have a high "Total Equivalent Warming Impact" (TEWI).
A.
B.
46.  The DOT-approved cylinder used for recovering refrigerant is gray and yellow.
A.
B.
47.  A refrigerant reclaimed from a system may be charged back into the system from which it came.
A.
B.
48.  Mechanical refrigerant recovery equipment must meet specification established by the 1993 ARI 740 standard.
A.
B.
49.  When technicians works for a company in which the technician does not have a financial interest, the technician does not have to be certified.
A.
B.
50.  Glide is the range of temperatures/pressures in which a blended refrigerant will condense.
A.
B.
51.  One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the the technician how much refrigerant was used.
A.
B.
52.  The quickest method to charge a system is to charge only vapor.
A.
B.
53.  When adding refrigerant in vapor form to a refrigeration system, the system motor/compressor assembly is running.
A.
B.
54.  When adding refrigerant in liquid form into the high-side of the system, the system motor/compressor assembly is running.
A.
B.
55.  Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.
A.
B.
56.  A manufacturer's charging chart may be used when available to determine the correct charge for a system.
A.
B.
57.  When the system pressures are lower than the pressure in the refrigerant tank, such as when the system has just been evacuated or if the system is out of refrigerant, refrigerant can be added to both the high and low pressure sides of the system.
A.
B.
58.  If the tank is a reusable tank, there are no check valves and system refrigerant can enter the tank as long as the system pressure is higher than the pressure in the tank.
A.
B.
59.  When using a "standing pressure test" for leak-checking, ________ should never be used since an explosive mixture can be created.
60.  ________ microns is equal to 1 mm Hg.
61.  The temperature sensitive resistor commonly used in a vacuum gauges is called a ________.
62.  Sludge is a produced when ________, ________, and ________ are present in the system.
63.  There are ________ microns in 1 mm Hg.
64.  Only two substances should be in the refrigeration system for proper operation.  They are ________ and ________.
1 comment
65.  A deep vacuum involves reducing the pressure in a refrigeration system to a micron gauge reading of ________ or below.
66.  The sensing element of a micron gauge must always be mounted with the fitting at the ________.
67.  Ozone is produced mainly by a process called ________ .
68.  The trapping of the Earth's heat in the atmosphere which is causing global warming is called the ________.
69.  HCFC-based blends work best with ________ lubricants, while HFC-based blends work best with ________ lubricants.
70.  Production of CFC refrigerants became illegal on ________.
71.  Refrigerants that damage the ozone layer contain an element called ________.
72.  The DOT-approved cylinder in which refrigerant may be recovered has a mechanism for shutting the recovery system off when it reaches approximately ________ full.
73.  The fastest way to remove refrigerant from a system is with the refrigerant in a ________.
74.  The fine for venting refrigerant into the atmosphere can be as high as ________ per day.
75.  When working on a refrigeration or air-conditioning system, along with tools and test equipment, the service technician, to avoid penalty, must have a ________ or ________  on the job site.
76.  The small amount of refrigerant released when removing gauge hoses from the system is called ________.
77.  The charging device that holds refrigerant, has a visible column of liquid, and can be used to "visually" see the amount of refrigerant used is called the ________.
78.  Refrigerant in vapor form is added to the system through the ________ side of the system.
79.  When refrigerant cylinder is connected to an operating system, the pressure in the cylinder will be ________ than the suction pressure of the system.
80.  As refrigerant vapor is removed from a supply cylinder, the pressure in the supply cylinder will ________.
81.  The ________ is used to help technicians perform a number of tasks including taking pressure readings on the high side of the system and trapping all of the system refrigerant in the receiver to perform system service.
82.  A device commonly used for detecting refrigerant leaks is a(n) ________.
A.
B.
C.
D.
83.  When taking a temperature reading of a copper suction line, it is important to insulate the sensing element to give a more accurate reading.
A.
B.
84.  The accuracy of a thermometer is more important when working on high temperature refrigeration (air conditioning) systems.
A.
B.
85.  When taking the temperature of the liquid line of a refrigeration system, the thermometer probe of an electronic thermometer does not have to be insulated.
A.
B.
Back to top


to post comments.

Removing ad is a premium feature

Upgrade and get a lot more done!
Take Another Quiz