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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A7 Refrigeration components: practice questions

Our ASE A1–A8 bank has 11 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A7 Heating & Air Conditioning

When should the accumulator or receiver-drier usually be replaced?

  1. Never
  2. When the system has been opened for major repair or contaminated
  3. At every oil change or at least once a year
  4. Only when it rattles
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B. When the system has been opened for major repair or contaminated — Follow the maker's guidance after compressor failure.

Question 2 · A7 Heating & Air Conditioning

Why are new O-rings lubricated before assembly of A/C fittings?

  1. To seal properly without tearing, using the specified oil
  2. To color-code them
  3. To make them expand slightly so they fill the fitting groove
  4. They should be installed dry
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A. To seal properly without tearing, using the specified oil — Use the correct O-ring material for the refrigerant.

Question 3 · A7 Heating & Air Conditioning

Systems using an orifice tube have which component on the low side?

  1. A thermal expansion valve
  2. A sight glass
  3. An accumulator
  4. A receiver-drier
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C. An accumulator — TXV systems use a receiver-drier on the high side.

Question 4 · A7 Heating & Air Conditioning

How is A/C compressor clutch air gap checked?

  1. With a feeler gauge between the clutch plate and pulley
  2. With a vacuum gauge
  3. With an ohmmeter across the clutch coil and plate
  4. With a refractometer
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A. With a feeler gauge between the clutch plate and pulley — Too large a gap may stop the clutch engaging when hot.

Question 5 · A7 Heating & Air Conditioning

Where is the receiver-drier located in a TXV system?

  1. Inside the compressor
  2. On the low side after the evaporator, at the compressor inlet
  3. In the high-side liquid line after the condenser
  4. In the heater box
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C. In the high-side liquid line after the condenser — It stores liquid and removes moisture.

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