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