Mazda Training manual - part 279

AIR CONDITIONING 
SG00b - Pre-Test

 

 

SG00b-1

TC070-15-01H

1. Technician A says the refrigerant used in the A/C system absorbs and releases 
large amounts of heat as it changes from a liquid to a gas.  
Technician B says as the refrigerant circulates through the tubes and hoses of an 
operating A/C system, it constantly changes from a liquid to a gas and back to a 
liquid again. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

 
 

 
 
2. Technician A says that at point E in 
this illustration the refrigerant is high 
pressure vapor. 
Technician B says at point E in this 
illustration the refrigerant is a low 
pressure vapor. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

  
 
 

 
 
3. One BTU is the amount of heat needed at sea level to raise the temperature of 
one pound of water; 

a.  One degree Centigrade 
b.  Ten degrees Centigrade 
c.  Ten degrees Fahrenheit 
d.  One degree Fahrenheit 

 
 
4. Technician A says the latent heat applied to change a substance from a liquid to a 
vapor is called the latent heat of vaporization. 
Technician B says the latent heat applied to change a substance from a liquid to a 
vapor is called the latent heat of condensation. 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

AIR CONDITIONING 
SG00b - Pre-Test

 

 

SG00b-2

TC070-15-01H

5. Technician A says in a Mazda A/C system the refrigerant changes state from a 
liquid to a vapor in the compressor while losing heat. 
Technician B says the compressor acts as a pump for the refrigerant in an A/C 
system. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

 
 
6. Technician A says the compressor increases the temperature of the vaporized 
refrigerant without adding heat. 
Technician B says the compressor raises the pressure of the vaporized refrigerant 
and not the temperature. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

 
 

 
 
7. Which component in this 
illustration receives hot, high 
pressure refrigerant gas from the 
compressor and transfers the heat to 
the outside air. 

a. 2 
b. 3 
c. 4 
d. 5 

 
 
 
 
 

 
 
8. Technician A says the expansion valve or orifice tube controls the amount of 
refrigerant entering the evaporator. 
Technician B says the accumulator regulates the refrigerant flow to the evaporator. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

 
 

1

2

3

4

5

AIR CONDITIONING 
SG00b - Pre-Test

 

 

SG00b-3

TC070-15-01H

9. Which component in this 
illustration removes heat from the 
passenger compartment and 
transfers it to the refrigerant? 

a. 2 
b. 3 
c. 4 
d. 5 

 
  
 
 
 
 
 
 
 
10. At point A the refrigerant is; 

a.  High pressure liquid 
b.  High pressure vapor 
c.  Low pressure liquid 
d.  Low pressure vapor 

 
 
 
 
 
 
 
 
 
 
 

 
11. Technician A says R-12 and R-134a system have different-sized service valves, 
to prevent accidental mixing of refrigerants. 
Technician B says R-134a systems use larger, metric-thread, quick connect service 
valves. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

1

2

3

4

5

AIR CONDITIONING 
SG00b - Pre-Test

 

 

SG00b-4

TC070-15-01H

12. Technician A says do not expose refrigerant to open flame. R-12 may produce 
poisonous phosgene gas, and R-134a may support combustion. 
Technician B says a propane torch style leak detector is the best type of detector for 
R-12 and R134a systems. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

 
 
 
13. Technician A says if refrigeration oil is not sealed properly, it will absorb moisture 
from the air. 
Technician B says you can reuse refrigeration oil removed from an operating A/C 
system. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
a.  Neither technician  

 
 
 
14. Technician A says after repairs have been performed, or if a system has been 
open for a long period of time, the system must be evacuated to remove moisture 
and ensure that it will hold a vacuum. 
Technician B says the minimum time any system should be evacuated is 15 minutes. 
The longer the system has been open, the longer it should be evacuated. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician 

 
 
 
15. Technician A says all refrigerant should be recovered and recycled. 
Technician B says only R-12 needs to be recovered and recycled. 
Who is correct? 

a. Technician A 
b. Technician B 
c. Both Technicians 
d. Neither technician