TT April 08 Pop Quiz: A/C Systems -

TT April 08 Pop Quiz: A/C Systems

This month’s Pop Quiz addresses air conditioning systems. Students should chose the answer that best completes the following questions or statements.

This month’s Pop Quiz addresses air conditioning systems. Students should chose the answer that best completes the following questions or statements.
Answers to the quiz are available below.

1) Air conditioning system designs are defined by the restriction used to create a pressure drop in the system.  Commonly used restrictions in current production models include:
A. Orifice tube
B. Thermostatic Expansion Valve
C.  Suction throttling valve
D. All of the above
E. A and B only

2) HVAC mode and temperature controls can be controlled in which of the following fashions:
A. Vacuum operated controls
B) Cable operated controls
C) Electronically operated controls
D) Any combination of the above
E) Only A and C

3) The ________ separates the high-pressure and low-pressure sides of the system, is considered the heart of the A/C system.
A. Condenser
B. Compressor
C.  Thermostatic expansion valve
D. Orifice tube

4) Which of the following oil is used in original equipment R-134a A/C systems?
A. Ester oil
B. Mineral oil
C. PAG oil
D. DOT3 oil

5) A/C systems have a limited amount of “built-in” protection against moisture contamination called ________ – which consists of moisture-absorbing crystals in a small bag or pouch inside the accumulator or receiver-drier.
A. desiccant
B. humidapouch
C. evapatron
D. HVACuum

6) The A/C restriction …
A. creates an area of high pressure
B. controls flow through the entire system
C. meters the correct amount of refrigerant into the evaporator
D. B and C only
E. A, B and C

7) Moisture contamination in an A/C system allows for the formation of corrosive acids that attack metal surfaces and break down the lubricating properties of refrigerant oil and form sludge.  The combination of sludge and other contaminants creates unwanted restrictions which can be located by
A. sweat forming near the restriction
B. ice developing at the restriction
C. ice developing after the restriction
D. visually inspect mating surfaces of lines and components

8) Evacuating an A/C system involves “pulling” a vacuum of 29___ on the refrigerant system and leaving it under a vacuum state for between 30 minutes and an hour or more in areas of high humidity.
A. Lbs.
B. Ft. Lbs.
C. inHg
D. PSI

9) Air conditioning service ports …
A. are the same on R-12 and R-134a systems
B. are the same on the low and high side portions of the A/C system
C. differs from one refrigerant system to the next and differs from low and high sides of the system
D. none of the above

10) All refrigerant must be ________ from the system before the replacement of any air conditioning component.
A. vented
B. evaporated
C. charged
D. reclaimed

Scroll down for the answers to the April Pop Quiz.

April T2 Pop Quiz Answers

1) Air conditioning system designs are defined by the restriction used to create a pressure drop in the system.  Commonly used restrictions in current production models include:
A. Orifice tube
B. Thermostatic Expansion Valve
C.  Suction throttling valve
D. All of the above
E. A and B only

2) HVAC mode and temperature controls can be controlled in which of the following fashions:
A. Vacuum operated controls
B) Cable operated controls
C) Electronically operated controls
D) Any combination of the above
E) Only A and C

3) The ________ separates the high-pressure and low-pressure sides of the system, is considered the heart of the A/C system.
A. Condenser
B. Compressor
C.  Thermostatic expansion valve
D. Orifice tube

4) Which of the following oil is used in original equipment R-134a A/C systems?
A. Ester oil
B. Mineral oil
C. PAG oil
D. DOT3 oil

5) A/C systems have a limited amount of “built-in” protection against moisture contamination called ________ – which consists of moisture-absorbing crystals in a small bag or pouch inside the accumulator or receiver-drier.
A. desiccant
B. humidapouch
C. evapatron
D. HVACuum

6) The A/C restriction …
A. creates an area of high pressure
B. controls flow through the entire system
C. meters the correct amount of refrigerant into the evaporator
D. B and C only
E. A, B and C

7) Moisture contamination in an A/C system allows for the formation of corrosive acids that attack metal surfaces and break down the lubricating properties of refrigerant oil and form sludge.  The combination of sludge and other contaminants creates unwanted restrictions which can be located by
A. sweat forming near the restriction
B. ice developing at the restriction
C. ice developing after the restriction
D. visually inspect mating surfaces of lines and components

8) Evacuating an A/C system involves “pulling” a vacuum of 29___ on the refrigerant system and leaving it under a vacuum state for between 30 minutes and an hour or more in areas of high humidity.
A. Lbs.
B. Ft. Lbs.
C. inHg
D. PSI

9) Air conditioning service ports …
A. are the same on R-12 and R-134a systems
B. are the same on the low and high side portions of the A/C system
C. differs from one refrigerant system to the next and differs from low and high sides of the system
D. none of the above

10) All refrigerant must be ________ from the system before the replacement of any air conditioning component.
A. vented
B. evaporated
C. charged
D. reclaimed

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