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CHAPTER 10 QUESTIONS & ANSWERS 100% CORRECT

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1. What style of compressor can NOT be used in the industrial Ammonia refrigeration system? - ANSWERDynamic displacement 2. What are the three styles of positive displacement compressors used in our industry? - ANSWERReciprocating Rotary vane Rotary screw 8. Typically, reciprocating compressors require a minimal differential oil pressure of___above suction pressure? - ANSWER30 - 40 psi 9. High discharge temperatures are good for a compressor, creating a black sooty deposit. - ANSWERFalse

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CHAPTER 10 QUESTIONS &
ANSWERS 100% CORRECT

1. What style of compressor can NOT be used in the industrial Ammonia
refrigeration system? - ANSWERDynamic displacement

2. What are the three styles of positive displacement compressors used in our
industry? - ANSWERReciprocating
Rotary vane
Rotary screw

8. Typically, reciprocating compressors require a minimal differential oil pressure
of___above suction pressure? - ANSWER30 - 40 psi

9. High discharge temperatures are good for a compressor, creating a black sooty
deposit. - ANSWERFalse

10. How are blades forced outwards in a rotary vane compressor? -
ANSWERCentrifugal force

11. If there is a small percentage of Ammonia absorbed into the oil, it will cause the
oil to___when the pressure upon the oil is lowered. - ANSWERFoam

12. Are oil and liquid Ammonia considered to be miscible? (Come together to create
a new solution) - ANSWERNo, oil is heavier than liquid Ammonia

3. What is the practical max compression ratio for a rotary vane compressor? -
ANSWER4:1 CR

4. What is the practical max compression ratio for a rotary screw compressor? -
ANSWER20:1 CR

What is the practical max compression ratio for the reciprocating compressor? -
ANSWER8:1 CR

6. What is one of the most important aspects that an operator must look for before
starting up a compressor? - ANSWERCheck oil levels

7. Capacity control mechanism of a compressor is actuated by? - ANSWERSuction
pressure


13. If a compressor took a slug of liquid Ammonia and is hydraulically pounding what
action must an operator do if all possible? - ANSWERShut it off, and notify
management immediately

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