ABYC Air Conditioning & Refridgeration Certification Exam Review
Study online at https://quizlet.com/_4w5o30
1. Absolute Humidity The weight of water vapor in a given amount of air (Grains per cubic foot)
2. Absolute Pressure Pressure measured with a base of zero
3. Absolute Tempera- A temperature scale using absolute zero as a reference - Rankin or Kelvin Scale
ture (may be measures in degrees C or F)
4. Absolute Zero Theoretical temperature at which all molecular activity ceases = -273.16 C or
-456.69 F
5. 250% By approximately how much (%) does a start capacitor increase motor torque?
6. C. Both Tech A says that it is possible to identify the start and run windings of a motor
with an ohm meter by noting which has higher resistance, indicating the start
windings. Tech B say the highest resistance will be noted when measuring from
run to start terminals. Which is correct?
A. Tech A
B. Tech B
C. Both
D. Neigher
7. Compressor The heart of a system, keeps the refridgerant flowing at specific rates of flow, at
specific temperatures.
8. Inlet (suction), On which side of a compressor is the low pressure switch, inlet or outlet, and
shuts down sys- what function does it provide?
tem if pressure
drops too low.
9. Outlet, shuts down On which side of a compressor is the high pressure switch, inlet or outlet, and
compressor if what function does it provide?
pressure gets too
, ABYC Air Conditioning & Refridgeration Certification Exam Review
Study online at https://quizlet.com/_4w5o30
high (to protect
the compressor).
10. Condenser Air or water cooled heat exchanger which absorbs latent heat energy of hot
refridgerant gas and causes it to become a liquid.
11. Metering Device Maintains a specific rate of flow from the high-pressure side of a refridgeration
(AKA Expansion system into the low-pressure side.
De-
vice/Tube/Valve,
TXV, or Capillary
Tube)
12. Evaporator Air heat-exchanger that allows heat from incoming air to pass into the cold
refridgerant liquid which absorbs latent heat and evaporates in the process,
cooling the exit air.
13. KLIXON overload Trademark for a popular manufacturer of compressor overload protector device.
protector (Also manufactures overcurrent protection devices, switches, and thermostats
used in HVAC systems)
14. Running at low- What is a common cause of motor winding insulation leakage/breakdown?
er than rated volt-
age (increases cur-
rent draw and
thus temperature
of windings)
15. 3.412 BTU's/Hour 1 Watt is equal to how many BTU's per hour?
= 1 Watt
16. 1 BTU / hr = 0.293 1 BTU per hour is equal to how many Watts?
Watts
, ABYC Air Conditioning & Refridgeration Certification Exam Review
Study online at https://quizlet.com/_4w5o30
17. Tech B (motors When calculating power draw for a motor, Tech A says to multiply Amps by
have PF < 1) Volts. Tech B says this is true, but it would be more accurate to include a third
multiplier, Power Factor to give accurate real power draw. Who is most correct?
18. Potential Relay Another name for Start Relay
19. return should be Ho much bigger should an air conditioning return duct be compared to the
20% bigger than discharge duct?
source
20. Waist heigh or At what height should A/C discharge ducts be located in the cabin?
higher
21. low, near the floor At what height should A/C return duct sources be located in the cabin?
22. risk of CO ingress Why should A/C condensate drain hose not be discharged into the engine room
bilge area?
23. 3 feet What is the minimal distance on the outside of the hull between A/C condensate
discharge outlet and engine exhaust outlet?
24. 5/8 inch What is the minimum diameter recommended for A/C condensate drain hose?
25. increased suction What are some possible manifestation from an overly dirty A/C air filter?
causing low-pres-
sure switch activa-
tion or tripped cir-
cuit breaker
26. True T or F: although ABYC does not require double hose clamping on thru-hull
seacocks, ISO standards and many manufacturer's do recommend it.
27. 48 inches What is the max distance between support clamps for refrigerant piping?
, ABYC Air Conditioning & Refridgeration Certification Exam Review
Study online at https://quizlet.com/_4w5o30
28. B. Leaking gasket A technician notices air bubbles visible through the clear section of a raw-water
in sea strainer sea strainer. What is the most likely cause?
A. Boat was excessively healed over
B. Leaking gasket in sea strainer
C. Leaking gasket in raw water pump
D. Blockage in compressor discharge
29. Wooden boat In what type of boat should A/C condensate not be drained directly into the
bilge?
30. toxic gas creat- Why must an A/C system be evacuated (recovery) before brazing?
ed when freon is
heated (phosgene)
31. prevent oxides Why use nitrogen gas inside copper tubing when brazing?
from forming on
inside of copper
tubing
32. flare fitting What is the most dependable mechanical connection for refrigerant piping?
33. blown compressor What might it mean if a technician observes oil at or around refrigerant fittings?
seal
34. 1. leak in external upon evacuating a refrigerant system, a technician notices a slow, steady rise
fittings or vacuum on the micron gauge. What are three possible likely causes for this?
pump
2. leak in refriger-
ant system
3. moisture in re-
frigerant system
35. D, E, B, C, A
Study online at https://quizlet.com/_4w5o30
1. Absolute Humidity The weight of water vapor in a given amount of air (Grains per cubic foot)
2. Absolute Pressure Pressure measured with a base of zero
3. Absolute Tempera- A temperature scale using absolute zero as a reference - Rankin or Kelvin Scale
ture (may be measures in degrees C or F)
4. Absolute Zero Theoretical temperature at which all molecular activity ceases = -273.16 C or
-456.69 F
5. 250% By approximately how much (%) does a start capacitor increase motor torque?
6. C. Both Tech A says that it is possible to identify the start and run windings of a motor
with an ohm meter by noting which has higher resistance, indicating the start
windings. Tech B say the highest resistance will be noted when measuring from
run to start terminals. Which is correct?
A. Tech A
B. Tech B
C. Both
D. Neigher
7. Compressor The heart of a system, keeps the refridgerant flowing at specific rates of flow, at
specific temperatures.
8. Inlet (suction), On which side of a compressor is the low pressure switch, inlet or outlet, and
shuts down sys- what function does it provide?
tem if pressure
drops too low.
9. Outlet, shuts down On which side of a compressor is the high pressure switch, inlet or outlet, and
compressor if what function does it provide?
pressure gets too
, ABYC Air Conditioning & Refridgeration Certification Exam Review
Study online at https://quizlet.com/_4w5o30
high (to protect
the compressor).
10. Condenser Air or water cooled heat exchanger which absorbs latent heat energy of hot
refridgerant gas and causes it to become a liquid.
11. Metering Device Maintains a specific rate of flow from the high-pressure side of a refridgeration
(AKA Expansion system into the low-pressure side.
De-
vice/Tube/Valve,
TXV, or Capillary
Tube)
12. Evaporator Air heat-exchanger that allows heat from incoming air to pass into the cold
refridgerant liquid which absorbs latent heat and evaporates in the process,
cooling the exit air.
13. KLIXON overload Trademark for a popular manufacturer of compressor overload protector device.
protector (Also manufactures overcurrent protection devices, switches, and thermostats
used in HVAC systems)
14. Running at low- What is a common cause of motor winding insulation leakage/breakdown?
er than rated volt-
age (increases cur-
rent draw and
thus temperature
of windings)
15. 3.412 BTU's/Hour 1 Watt is equal to how many BTU's per hour?
= 1 Watt
16. 1 BTU / hr = 0.293 1 BTU per hour is equal to how many Watts?
Watts
, ABYC Air Conditioning & Refridgeration Certification Exam Review
Study online at https://quizlet.com/_4w5o30
17. Tech B (motors When calculating power draw for a motor, Tech A says to multiply Amps by
have PF < 1) Volts. Tech B says this is true, but it would be more accurate to include a third
multiplier, Power Factor to give accurate real power draw. Who is most correct?
18. Potential Relay Another name for Start Relay
19. return should be Ho much bigger should an air conditioning return duct be compared to the
20% bigger than discharge duct?
source
20. Waist heigh or At what height should A/C discharge ducts be located in the cabin?
higher
21. low, near the floor At what height should A/C return duct sources be located in the cabin?
22. risk of CO ingress Why should A/C condensate drain hose not be discharged into the engine room
bilge area?
23. 3 feet What is the minimal distance on the outside of the hull between A/C condensate
discharge outlet and engine exhaust outlet?
24. 5/8 inch What is the minimum diameter recommended for A/C condensate drain hose?
25. increased suction What are some possible manifestation from an overly dirty A/C air filter?
causing low-pres-
sure switch activa-
tion or tripped cir-
cuit breaker
26. True T or F: although ABYC does not require double hose clamping on thru-hull
seacocks, ISO standards and many manufacturer's do recommend it.
27. 48 inches What is the max distance between support clamps for refrigerant piping?
, ABYC Air Conditioning & Refridgeration Certification Exam Review
Study online at https://quizlet.com/_4w5o30
28. B. Leaking gasket A technician notices air bubbles visible through the clear section of a raw-water
in sea strainer sea strainer. What is the most likely cause?
A. Boat was excessively healed over
B. Leaking gasket in sea strainer
C. Leaking gasket in raw water pump
D. Blockage in compressor discharge
29. Wooden boat In what type of boat should A/C condensate not be drained directly into the
bilge?
30. toxic gas creat- Why must an A/C system be evacuated (recovery) before brazing?
ed when freon is
heated (phosgene)
31. prevent oxides Why use nitrogen gas inside copper tubing when brazing?
from forming on
inside of copper
tubing
32. flare fitting What is the most dependable mechanical connection for refrigerant piping?
33. blown compressor What might it mean if a technician observes oil at or around refrigerant fittings?
seal
34. 1. leak in external upon evacuating a refrigerant system, a technician notices a slow, steady rise
fittings or vacuum on the micron gauge. What are three possible likely causes for this?
pump
2. leak in refriger-
ant system
3. moisture in re-
frigerant system
35. D, E, B, C, A
