115
Chapter 35
End of Chapter Review Questions Answer Key
1. The amount of heat required to raise the temperature of 1 pound of water by 10°F is:
2. Which of the following is true in a properly functioning refrigeration system?
3. Which component in an air-conditioning system is responsible for removing heat
from the circulating refrigerant?
4. Which of the following best describes the function of the TXV?
5. The two main refrigerant lines are known as the:
6. Technician A wears safety goggles and rubber gloves when discharging the A/C
system. Technician B wears safety goggles and leather gloves when charging and leak
testing the system. Who is correct?
7. When checking an A/C sight glass for the moisture content of the refrigerant,
Technician A performs the check with the air conditioner running immediately after
starting the engine. Technician B says that some observable bubbles in the sight glass
at system startup are normal. Who is correct?
116
8. Which of the following procedures may improve HVAC system performance?
9. Which method of detecting a leak in the A/C system would be most sensitive when
attempting to locate a very small leak?
10. Which piece of equipment is used to meter out a desired amount of specific
refrigerant by weight?
11. Purging and flushing an A/C system are alike because both procedures:
12. Technician A uses refrigerant from an opened container that he knows has been
tightly sealed since immediately after its previous use. Technician B says that
recycled refrigerant known to be uncontaminated can be reused on recharging an A/C
system. Who is correct?
13. When evacuating an R-134a system, how long should the vacuum pump be run after
the low-pressure manifold gauge pulls 29.9 inches (760 mm) Hg vacuum?
14. Which of the following is the likely result of a slightly low charge of refrigerant in a
truck A/C system?
117
15. Which of the following conditions could cause the low-side pressure to read high and
the high-side pressure to read low?
16. Which of the following is a typical input of an electronically managed A/C system?
17. Which of the following components provides the HVAC control module with
temperature data?
18. The expansion valve in an A/C circuit sticks in the open position. What is the likely
result when the system is tested?
19. Which of the following components is not a heat exchanger?
20. When using generic software to access the vehicle data bus, what SA/MID
specifically identifies the HVAC control system?