I. Choose the best answer for each sentence (4 pts) 1. The has a fixed shape and volume. a. solid b. liquid C. gas d. plasma 2. Removing heat causes gases to become liquids which is called a. fusion b. condensation C. vaporization d. sublimation 3. Substances exist in three states depending on their a. temperature b. pressure C. heat content d. all a,b,c 4. The compressors consist of impeller and volute. a. rotary b. scroll C. reciprocating d. centrifugal 5. The compressor you are repairing is mine. d. where a. that b. who C. whose 6. After finishing leak test and vacuum drying provide around the piping. d. the heat insulation a. a hole b. a test C. the drain piping 7. Hammers screwdrivers and spanners are a. instruments b. machines C. utensils d. tools 8. The wiring is improperly connected, can cause inoperative units. a. that b. who C. which d. where 9. The unit improperly installed can make noisy operation. d.a b are correct a. fan coil b. condensing C. compressor 10. The ends of the tubes should be sealed until to the rest of the system. a. connected b. controlled C. carried d. sealed 11. Pressure lower than atmospheric pressure are called a. vacuum b. temperature C. refrigerant d. heat 12. The customer refrigerator you are repairing is friendly. a. who b. whose C. where d. which 13. The seal of compressors must prevent from entering. a. moisture b. air C. water d. a,b,c are correct 14. A manifold gauge is also very useful when maintenance on an older AC. a. watching b. giving C. performing d. bor c is correct 15. He told me the reason he could not repair my compressor. d. that a. when b. why C. which 16. Scroll compressors have moving parts than reciprocating types. d. little a. more b. many C. fewer

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I. Choose the best answer for each sentence (4 pts) 1. The has a fixed shape and volume. a. solid b. liquid C. gas d. plasma 2. Removing heat causes gases to become liquids which is called a. fusion b. condensation C. vaporization d. sublimation 3. Substances exist in three states depending on their a. temperature b. pressure C. heat content d. all a,b,c 4. The compressors consist of impeller and volute. a. rotary b. scroll C. reciprocating d. centrifugal 5. The compressor you are repairing is mine. d. where a. that b. who C. whose 6. After finishing leak test and vacuum drying provide around the piping. d. the heat insulation a. a hole b. a test C. the drain piping 7. Hammers screwdrivers and spanners are a. instruments b. machines C. utensils d. tools 8. The wiring is improperly connected, can cause inoperative units. a. that b. who C. which d. where 9. The unit improperly installed can make noisy operation. d.a b are correct a. fan coil b. condensing C. compressor 10. The ends of the tubes should be sealed until to the rest of the system. a. connected b. controlled C. carried d. sealed 11. Pressure lower than atmospheric pressure are called a. vacuum b. temperature C. refrigerant d. heat 12. The customer refrigerator you are repairing is friendly. a. who b. whose C. where d. which 13. The seal of compressors must prevent from entering. a. moisture b. air C. water d. a,b,c are correct 14. A manifold gauge is also very useful when maintenance on an older AC. a. watching b. giving C. performing d. bor c is correct 15. He told me the reason he could not repair my compressor. d. that a. when b. why C. which 16. Scroll compressors have moving parts than reciprocating types. d. little a. more b. many C. fewer

Answer 1

1. **a. solid** Solids have a definite shape and volume. 2. **b. condensation** Condensation is the process of a gas turning into a liquid. 3. **d. all a,b,c** The state of a substance (solid, liquid, or gas) depends on its temperature, pressure, and heat content. 4. **d. centrifugal** Centrifugal compressors use an impeller and volute to compress the gas. 5. **a. that** "That" is the correct relative pronoun to refer to the compressor. 6. **d. the heat insulation** The sentence implies insulating the piping after the leak test. 7. **d. tools** Hammers, screwdrivers, and spanners are tools. 8. **c. which** "Which" refers to the improperly connected wiring. 9. **d. a b are correct** Both a fan coil unit and a condensing unit improperly installed can cause noisy operation. 10. **a. connected** The sentence implies sealing the tubes until they are connected to the system. 11. **a. vacuum** A vacuum is pressure lower than atmospheric pressure. 12. **b. whose** "Whose" shows possession – the customer *owns* the refrigerator. 13. **d. a,b,c are correct** Compressor seals should prevent moisture, air, and water from entering. 14. **c. performing** Performing maintenance is the correct context. 15. **d. that** "That" introduces the reason. 16. **c. fewer** Scroll compressors have fewer moving parts than reciprocating compressors.

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