ABYC AIR CONDITIONING &
REFRIDGERATION
CERTIFICATION EXAM
REVIEW COMPREHENSIVE
QUESTIONS (FREQUENTLY
TESTED)WITH VERIFIED
ANSWERS GRADED A+
[Document subtitle]
[DATE]
[COMPANY NAME]
[Company address]
, Contact for further consultation
1. The weight of water vapor in a given amount of air (Grains per cubic
foot) Answer: -
Absolute Humidity
2. Pressure measured with a base of zero Answer: Absolute Pressure
3. A temperature scale using absolute zero as a reference - Rankin
or Kelvin Scale (may be measures in degrees C or F) Answer: Absolute
Temperature
4. Theoretical temperature at which all molecular activity ceases = -
273.16 C or
-456.69 F Answer: Absolute Zero
5. By approximately how much (%) does a start capacitor
increase motor torque? Answer: 250%
6. 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
, Contact for further consultation
B. Tech B
C. Both
D. Neigher Answer: C. Both
7. The heart of a system, keeps the refridgerant flowing at specific
rates of flow, at specific temperatures. Answer: Compressor
8. On which side of a compressor is the low pressure switch, inlet or
outlet, and what function does it provide? Answer: Inlet (suction), shuts down
system if pressure drops too low.
9. On which side of a compressor is the high pressure switch, inlet or
outlet, and what function does it provide? Answer: Outlet, shuts down compressor if
pressure gets too high (to protect the compressor).
10. Air or water cooled heat exchanger which absorbs latent heat
energy of hot refridgerant gas and causes it to become a liquid.
Answer: Condenser
11. Maintains a specific rate of flow from the high-pressure side of
a refridgera- tion system into the low-pressure side. Answer: Metering Device (AKA
Expansion Device/Tube/Valve, TXV, or Capillary Tube)
, Contact for further consultation
12. 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. Answer: Evaporator
13. Trademark for a popular manufacturer of compressor
overload protector device. (Also manufactures overcurrent protection
devices, switches, and ther- mostats used in HVAC systems) Answer:
KLIXON overload protector
14. What is a common cause of motor winding insulation
leakage/breakdown?-
Answer: Running at lower than rated voltage (increases current draw and thus temperature of windings)
15. 1 Watt is equal to how many BTU's per hour? Answer: 3.412
BTU's/Hour = 1 Watt
16. 1 BTU per hour is equal to how many Watts? Answer: 1 BTU / hr =
0.293 Watts
17. When calculating power draw for a motor, Tech A says to
multiply Amps by Volts. Tech B says this is true, but it would be
more accurate to include a third multiplier, Power Factor to give
REFRIDGERATION
CERTIFICATION EXAM
REVIEW COMPREHENSIVE
QUESTIONS (FREQUENTLY
TESTED)WITH VERIFIED
ANSWERS GRADED A+
[Document subtitle]
[DATE]
[COMPANY NAME]
[Company address]
, Contact for further consultation
1. The weight of water vapor in a given amount of air (Grains per cubic
foot) Answer: -
Absolute Humidity
2. Pressure measured with a base of zero Answer: Absolute Pressure
3. A temperature scale using absolute zero as a reference - Rankin
or Kelvin Scale (may be measures in degrees C or F) Answer: Absolute
Temperature
4. Theoretical temperature at which all molecular activity ceases = -
273.16 C or
-456.69 F Answer: Absolute Zero
5. By approximately how much (%) does a start capacitor
increase motor torque? Answer: 250%
6. 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
, Contact for further consultation
B. Tech B
C. Both
D. Neigher Answer: C. Both
7. The heart of a system, keeps the refridgerant flowing at specific
rates of flow, at specific temperatures. Answer: Compressor
8. On which side of a compressor is the low pressure switch, inlet or
outlet, and what function does it provide? Answer: Inlet (suction), shuts down
system if pressure drops too low.
9. On which side of a compressor is the high pressure switch, inlet or
outlet, and what function does it provide? Answer: Outlet, shuts down compressor if
pressure gets too high (to protect the compressor).
10. Air or water cooled heat exchanger which absorbs latent heat
energy of hot refridgerant gas and causes it to become a liquid.
Answer: Condenser
11. Maintains a specific rate of flow from the high-pressure side of
a refridgera- tion system into the low-pressure side. Answer: Metering Device (AKA
Expansion Device/Tube/Valve, TXV, or Capillary Tube)
, Contact for further consultation
12. 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. Answer: Evaporator
13. Trademark for a popular manufacturer of compressor
overload protector device. (Also manufactures overcurrent protection
devices, switches, and ther- mostats used in HVAC systems) Answer:
KLIXON overload protector
14. What is a common cause of motor winding insulation
leakage/breakdown?-
Answer: Running at lower than rated voltage (increases current draw and thus temperature of windings)
15. 1 Watt is equal to how many BTU's per hour? Answer: 3.412
BTU's/Hour = 1 Watt
16. 1 BTU per hour is equal to how many Watts? Answer: 1 BTU / hr =
0.293 Watts
17. When calculating power draw for a motor, Tech A says to
multiply Amps by Volts. Tech B says this is true, but it would be
more accurate to include a third multiplier, Power Factor to give
