Basic Refrigeration Components — Texas ACR A Practice Questions

12 questions · 5% of the Texas ACR A exam

Worked questions

1. A charging exercise specifies that 12 lb must be transferred at a constant 1.5 lb/min. Ignoring setup and rate changes, how long does the transfer take?

A6 minutes
B18 minutes
8 minutes
D60 minutes

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why C is correct

12 / 1.5 = 8 minutes. Cooling capacity in tons does not specify refrigerant charge; the required mass is explicitly supplied.

2. A coil performance exercise gives sensible cooling of 18,000 Btu/h and latent cooling of 12,000 Btu/h. Define sensible heat ratio as sensible cooling divided by total cooling. What is SHR?

A0.40
0.60
C1.50
D0.67

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why B is correct

Total cooling = 18,000 + 12,000 = 30,000 Btu/h. SHR = 18,000 / 30,000 = 0.60. Sensible cooling exceeds latent cooling here; entering-air conditions alone would not determine this ratio.

3. A manufacturer’s stated charging worksheet specifies a 10 lb base charge plus 0.04 lb for each foot of line beyond 15 ft. With 40 ft of line, what total charge follows from this supplied worksheet?

A10 lb
B11.6 lb
11 lb
D25 lb

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why C is correct

Extra line = 40 − 15 = 25 ft. Additional charge = 25 × 0.04 = 1 lb; total = 11 lb. The formula is supplied for this exercise, not a generic charge rule for all equipment.

4. A low-temperature refrigeration system needs a replacement compressor. Which selection method is technically sound?

ASelect any rotary compressor because all rotary models suit low temperatures.
BUse only the cabinet floor area to choose compressor type.
CChoose the highest motor horsepower without checking refrigerant compatibility.
Match the refrigerant, required capacity and evaporating/condensing conditions to an approved operating envelope.

Where to look it up

https://www.copeland.com/en-us/products-solutions/compression-technologies-systems/semi-hermetic-compressors

Why D is correct

Compressor type alone does not establish suitability. Copeland identifies capacity, refrigerant and evaporating/condensing conditions as selection inputs. Verify the selected model at the intended duty point.

5. Which set of observations is directly useful in a semi-hermetic compressor maintenance inspection?

ACabinet paint color, room number and delivery date only.
Oil condition and level, electrical connections, and suction/discharge pressures.
CRefrigerant brand name alone, without operating measurements.
DCompressor age alone, without inspection or operating data.

Where to look it up

https://www.copeland.com/en-us/products-solutions/compression-technologies-systems/semi-hermetic-compressors

Why B is correct

These checks can reveal lubrication, electrical and operating problems. Inspection frequency must follow the equipment and service conditions; this question does not establish a universal annual interval.

6. Two walk-in coolers have equal floor area, but one has frequent door openings and receives warm product each day. What should its load calculation include?

Transmission, infiltration, product and internal loads.
BFloor area alone; the operating differences are irrelevant.
COnly the compressor motor nameplate horsepower.
DOnly the quantity of refrigerant currently in the system.

Where to look it up

https://e360blog.copeland.com/considerations-for-sizing-and-selecting-condensing-units-for-wicfs/

Why A is correct

Door traffic and incoming product add loads that equal floor area cannot capture. Calculate the design load before selecting equipment; this does not independently determine refrigerant charge.

6 more in the bank

Answers and explanations for these are in the app.

A refrigeration plant designed to handle a cooling load of 150 tons requires a compressor suitable for this application. Which of the following compressor types is most suitable?
A refrigeration system in a manufacturing facility is suspected of having a refrigerant leak. Which of the following methods is the most effective for detecting the leak?
What is the main function of the condenser coil in an industrial refrigeration plant?
What is the primary purpose of a finned evaporator coil in a retail store refrigeration system?
Which method is typically used to detect refrigerant leaks in an industrial refrigeration plant?
Which refrigerant is commonly used in medium-temperature commercial refrigeration systems due to its high refrigeration capacity and moderate environmental impact?

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Basic Refrigeration Components — Texas ACR A Practice Questions

Worked questions

1. A charging exercise specifies that 12 lb must be transferred at a constant 1.5 lb/min. Ignoring setup and rate changes, how long does the transfer take?

2. A coil performance exercise gives sensible cooling of 18,000 Btu/h and latent cooling of 12,000 Btu/h. Define sensible heat ratio as sensible cooling divided by total cooling. What is SHR?

3. A manufacturer’s stated charging worksheet specifies a 10 lb base charge plus 0.04 lb for each foot of line beyond 15 ft. With 40 ft of line, what total charge follows from this supplied worksheet?

4. A low-temperature refrigeration system needs a replacement compressor. Which selection method is technically sound?

5. Which set of observations is directly useful in a semi-hermetic compressor maintenance inspection?

6. Two walk-in coolers have equal floor area, but one has frequent door openings and receives warm product each day. What should its load calculation include?

6 more in the bank

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