286)
286)
Why do mini–split systems cost so much to install?
A)
The design is more complex than a normal split system.
B)
They have to be connected to a home’s present wiring.
C)
There are more lines to install.
D)
The parts break easily during installation.
Answer:
C
Explanation:
287)
287)
What type of heat pumps are commonly installed above the drop ceiling in each zone in a
commercial building?
A)
Horizontal water source heat pumps
B)
Air–source packaged heat pumps
C)
Air–source wall mount heat pumps
D)
Vertical water source heat pumps
Answer:
A
Explanation:
288)
288)
Types of closed loops include:
A)
Well systems, slinky loops, and horizontal loops.
B)
Horizontal loops, well systems, and slinky loops.
C)
Well systems, lake loops, and vertical loops.
D)
Horizontal loops, vertical loops, and slinky loops.
Answer:
D
Explanation:
289)
289)
How does the heating–cycle charge compensator aid the heating cycle?
A)
It fills with hot air.
B)
It makes the gas line cold.
C)
It stores the unneeded refrigerant.
D)
It raises the temperature of the refrigerant.
Answer:
C
Explanation:
76
290)
290)
What is the benefit of having separate thermostats in a mini–split system?
A)
Simpler connections between each system
B)
Increase in energy production
C)
Less space taken up
D)
Ability to control unused rooms
Answer:
D
Explanation:
291)
291)
The balance point of an air–source heat pump is the temperature at which:
A)
The system low–side and high–side pressures are the same.
B)
The heat pump heating capacity just matches the building heat loss.
C)
The cost of operating the heat pump is the same as the cost of operating a fossil fuel furnace.
D)
The heat pump cooling capacity matches the heat pump heating capacity.
Answer:
B
Explanation:
292)
292)
What prevents the refrigerant from flowing through the outdoor metering device during the
cooling cycle?
A)
The reversing valve
B)
The indoor check valve
C)
The outdoor check valve
D)
The cooling shutoff valve
Answer:
C
Explanation:
293)
293)
When adding a specific amount of refrigerant to a new system, how do you measure the amount
of refrigerant added?
A)
Use a digital scale to register charge as the refrigerant exits the cylinder.
B)
Use a digital scale to register charge as you add refrigerant to the cylinder.
C)
Use a digital scale to remove refrigerant until a negative number registers.
D)
Use a digital scale to weigh the refrigerant cylinder.
Answer:
A
Explanation:
77
294)
294)
What is the purpose of the check valves that are installed in parallel with the metering devices on
heat pumps?
A)
To provide a pressure testing port on both sides of the metering device
B)
To allow the technician to check the operation of the metering device without recovering
refrigerant
C)
To prevent excessive pressure difference across the metering device
D)
To direct the flow of refrigerant around the metering device that is not being used
Answer:
D
Explanation:
295)
295)
Open–loop water–source systems normally draw the water from:
A)
A shallow well.
B)
City water.
C)
A deep well.
D)
A nearby lake or pond.
Answer:
C
Explanation:
296)
296)
How have newer versions of the check valve been modified?
A)
One check valves can now connect to two metering devices.
B)
They are now part of metering devices.
C)
The metering devices are now inside the check valves.
D)
They are now insulated.
Answer:
B
Explanation:
297)
297)
What is the purpose of using an outdoor ambient thermostat on a heat pump installation?
A)
To prevent the heat pump from operating in heat unless it is cold outside
B)
To prevent the auxiliary heat from operating above the system balance point
C)
To bring the heat pump on early if the temperature drops
D)
To cycle the heat pump based on the outside temperature instead of the inside temperature
Answer:
B
Explanation:
78
298)
298)
Why do heat pumps operate more efficiently than electric furnaces?
A)
Refrigerant has a natural affinity for heat.
B)
Heat pumps use a more direct method of converting electrical energy to heat energy.
C)
They use electricity to move heat rather than converting electricity directly to heat.
D)
Heat pumps and electric furnaces actually operate at about the same efficiency.
Answer:
C
Explanation:
299)
299)
Which of the following factors affects how much you adjust the charge of a newly installed split
system?
A)
Length of the vapor line on the cylinder
B)
Charge allowance adjustment per foot of liquid line over 15 ft
C)
Amount of refrigerant in the system when you open the valves
D)
Recommendation of the refrigerant cylinder manufacturer
Answer:
B
Explanation:
300)
300)
The internal piston in the reversing valve is moved from one side to the other by:
A)
Permanent magnets attached to the ends of the piston.
B)
A stepper motor.
C)
A gear motor.
D)
Pressure difference.
Answer:
D
Explanation:
301)
301)
A heat pump outdoor unit is installed:
A)
In an excavation whose bottom is below the frost line.
B)
On a concrete pad.
C)
Directly on the ground.
D)
On a raised platform above the snow line.
Answer:
D
Explanation:
79
302)
302)
What capacity system will provide the best dehumidification in cooling for a house with a design
heat gain of 2 tons?
A)
A 2–ton system
B)
A 3–ton system
C)
A 4–ton system
D)
A 2.5–ton system
Answer:
A
Explanation:
303)
303)
What capacity system will provide the best operating efficiency in cooling for a house with a
design heat gain of 2 tons?
A)
A 2–ton system
B)
A 3–ton system
C)
A 4–ton system
D)
A 2.5–ton system
Answer:
A
Explanation:
304)
304)
What items should be checked when converting an indoor air handler from upflow configuration
to horizontal configuration?
A)
The cabinet feet must be relocated from the bottom to the side.
B)
The blower must be removed and turned around.
C)
The transformer and fan relay should be changed.
D)
Drain pan, correct drain opening, and service access
Answer:
D
Explanation:
305)
305)
How is the tubing used in ground–source systems joined?
A)
CPVC cement
B)
Flare fittings
C)
Thermal fusion
D)
Threaded fittings
Answer:
C
Explanation:
80
306)
306)
How is the condensate from the evaporator disposed of in a basement installation?
A)
The condensate drain can be plugged to prevent water from leaving, eliminating the need
for a drain.
B)
The air pressure in the system pushes the condensate up no more than 3 feet above the drain
pan.
C)
Condensate does not form on the coil when it is installed in a cool location.
D)
By using a condensate pump
Answer:
D
Explanation:
307)
307)
How is the optimal configuration for an air–source unit determined?
A)
By matching the type of unit with the type of building construction
B)
By selecting a heat pump that meets the building’s heat loss
C)
By installing a unit that has the lowest installed cost
D)
By considering the method of discharge
Answer:
A
Explanation:
MATCHING. Choose the item in column 2 that best matches each item in column 1.
Match the system characteristics with the correct system.
308)
Water source packaged heat pump
Answer:
C
309)
Split–system heat pump
Answer:
A
310)
Air–source packaged heat pump
Answer:
D
311)
Mini–split heat pump
Answer:
B
A)
consists of an outdoor and an indoor
section
B)
can connect multiple indoor sections to
one outdoor section
C)
entire unit sits inside the house
D)
whole unit sits outside house
308)
309)
310)
311)
81
Answer Key
Testname: UNIT 61 TO 70
1)
B
2)
A
3)
D
4)
B
5)
D
6)
D
7)
C
8)
B
9)
B
10)
D
11)
D
12)
C
13)
C
14)
C
15)
A
16)
D
17)
A
18)
B
19)
A
20)
B
21)
C
22)
D
23)
C
24)
C
25)
A
26)
A
27)
A
28)
B
29)
C
30)
B
31)
B
32)
C
33)
B
34)
C
35)
C
36)
D
37)
B
38)
B
39)
A
40)
C
41)
B
42)
B
82
Answer Key
Testname: UNIT 61 TO 70
43)
A
44)
A
45)
A
46)
D
47)
B
48)
C
49)
A
50)
A
51)
D
52)
A
53)
A
54)
B
55)
B
56)
D
57)
D
58)
C
59)
C
60)
B
61)
D
62)
B
63)
A
64)
A
65)
B
66)
D
67)
B
68)
D
69)
A
70)
A
71)
A
72)
C
73)
C
74)
D
75)
A
76)
D
77)
D
78)
D
79)
A
80)
A
81)
C
82)
B
83)
D
84)
A
83
Answer Key
Testname: UNIT 61 TO 70
85)
A
86)
B
87)
A
88)
B
89)
D
90)
C
91)
C
92)
C
93)
B
94)
A
95)
C
96)
D
97)
A
98)
B
99)
C
100)
D
101)
A
102)
C
103)
C
104)
C
105)
B
106)
D
107)
C
108)
C
109)
A
110)
A
111)
C
112)
A
113)
B
114)
C
115)
A
116)
C
117)
A
118)
B
119)
B
120)
C
121)
B
122)
B
123)
B
124)
C
125)
A
126)
A
84
Answer Key
Testname: UNIT 61 TO 70
127)
B
128)
B
129)
B
130)
B
131)
D
132)
D
133)
A
134)
A
135)
C
136)
C
137)
C
138)
C
139)
D
140)
B
141)
B
142)
D
143)
A
144)
D
145)
D
146)
A
147)
B
148)
A
149)
A
150)
B
151)
D
152)
D
153)
C
154)
A
155)
C
156)
B
157)
D
158)
B
159)
D
160)
C
161)
D
162)
A
163)
B
164)
A
165)
A
166)
C
167)
B
168)
D
85
Answer Key
Testname: UNIT 61 TO 70
169)
C
170)
D
171)
B
172)
D
173)
C
174)
C
175)
D
176)
D
177)
A
178)
A
179)
D
180)
A
181)
A
182)
A
183)
C
184)
A
185)
A
186)
B
187)
C
188)
A
189)
B
190)
C
191)
B
192)
B
193)
C
194)
C
195)
A
196)
C
197)
A
198)
C
199)
A
200)
C
201)
B
202)
D
203)
C
204)
A
205)
A
206)
D
207)
C
208)
C
209)
A
210)
C
86
Answer Key
Testname: UNIT 61 TO 70
211)
A
212)
A
213)
C
214)
B
215)
A
216)
C
217)
D
218)
A
219)
B
220)
D
221)
B
222)
B
223)
C
224)
B
225)
D
226)
C
227)
A
228)
D
229)
D
230)
B
231)
B
232)
D
233)
B
234)
D
235)
B
236)
A
237)
B
238)
C
239)
B
240)
B
241)
A
242)
D
243)
B
244)
B
245)
B
246)
A
247)
D
248)
B
249)
C
250)
B
251)
D
252)
C
87
Answer Key
Testname: UNIT 61 TO 70
253)
A
254)
B
255)
B
256)
C
257)
B
258)
D
259)
D
260)
B
261)
A
262)
A
263)
C
264)
A
265)
B
266)
B
267)
C
268)
B
269)
B
270)
B
271)
A
272)
B
273)
B
274)
C
275)
D
276)
B
277)
C
278)
C
279)
C
280)
C
281)
C
282)
C
283)
C
284)
C
285)
B
286)
C
287)
A
288)
D
289)
C
290)
D
291)
B
292)
C
293)
A
294)
D
88
Answer Key
Testname: UNIT 61 TO 70
295)
C
296)
B
297)
B
298)
C
299)
B
300)
D
301)
D
302)
A
303)
A
304)
D
305)
C
306)
D
307)
A
308)
C
309)
A
310)
D
311)
B
89