- Study guides, Class notes & Summaries

flash-gas - Answer-The presence of ___________ in the liquid lines reduces the efficiency of the refrigeration cycle, leads several expansion systems to work improperly and, increases superheating in vapor. A1 - Answer-According to ASHRAE refrigerant safety classification standard which designation would be the safest ? Attach DOT classification tags - Answer-When transporting cylinders containing used refrigerant, DOT requires that you ? CFC - Answer-What compound has the highest ozone...

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11 pages

Written in 2024/2025

Grade A+

lectknancy

Positive pressure testing of a new refrigeration system may be done: Using litmus paper. By filling the system with oxygen. By filling the system with ammonia. By filling the system with an inert gas. By filling the system with softened water. - Answer-by filling the system with an inert gas A sulphur candle is used to test for: Freon leaks Ammonia leaks Propane Vacuum seal CFC leaks - Answer-ammonia leaks Which of the following is NOT a problem asso...

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3 pages

Written in 2024/2025

Grade A+

lectknancy

Louisiana Refrigeration Contractor Exam Practice Questions And &Newline;Correct Answers &Lpar;Verified Answers&Rpar; Plus Rationale 2027 Q&Amp;A‖ &Newline;Instant Download Pdf&Period;&Ndash; Questions And Answers ‖ Verified And Well &Newline;Detailed Answers ‖ Plus Rationales ‖ Guaranteed Pass ‖ Latest Exam &Newline;Update

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95 pages

Written in 2026/2027

Grade A+

nursenancy1

Prepare for refrigeration exams with this complete review bundle featuring comprehensive study resources, practice materials, and key concept reviews. Covers refrigeration systems, HVAC fundamentals, thermodynamics, compressors, refrigerants, controls, troubleshooting, safety, maintenance, and essential operator concepts for exam readiness.

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6 items

CertifiedUSExamPrep

Prepare for the Turner Refrigeration Machine Operator Course with this comprehensive review resource featuring original practice questions designed to reinforce essential refrigeration and machine operation concepts. This review covers refrigeration principles, thermodynamics, compressors, condensers, evaporators, refrigerants, pressure-temperature relationships, electrical controls, piping systems, system operation, preventive maintenance, troubleshooting, workplace safety, applicable codes and...

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67 pages

Written in 2025/2026

Grade A+

CertifiedUSExamPrep

Prepare for the Refrigeration Machine Operator Course – Turner with this comprehensive 2026 Study Guide, designed to help learners build a strong understanding of refrigeration system operation, equipment maintenance, safety procedures, and industry best practices. This independently developed study resource features organized topic summaries, technical review notes, and original practice questions with detailed explanations to reinforce key concepts and support successful course preparatio...

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53 pages

Written in 2025/2026

Grade A+

SmartNursePrep

Z-51 Refrigeration Test Actual Exam Questions And Correct Detailed Answers ‖Already Graded A&Plus;

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61 pages

Written in 2025/2026

Grade A+

Sharonharry

Refrigeration Machine Operator Course Exam with Accurate Solutions

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36 pages

Written in 2025/2026

Grade A+

CLOUNDLite

Which is a disadvantage of a packaged indoor unit the potential for excessive noise exists Removing oil and filtering refrigerant for reuse is called recycle Which is the best description of temperature intensity of heat The type of head pressure control in a condenser that helps prevent drops in head pressure is the______ type fan cycling, condenser flooding, and damper control Which refrigeration system accessory is used to remove moisture, acid, and debris filter drier Nearly all e...

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10 pages

Written in 2024/2025

Grade A+

AnswersCOM

Mechanical refrigerant recovery equipment must meet specifications established by the 1993 ARI 740 standard. The correct answer is 'True'. How many chlorine atoms does it take to destroy 100,000 ozone molecules in the stratosphere? The correct answer is: 1 Which of the following is an example of an HCFC refrigerant? The correct answer is: R-22 Which type of refrigerant has the highest Ozone Depletion Potential (ODP)? The correct answer is: CFC The abbreviation for refrigerants con...

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3 pages

Written in 2024/2025

Grade A+

AnswersCOM

The US governmental body charged with enforcing the regulations of the Clean Air Act is the Environmenal Protection Agency (EPA) Section ________ of the Clean Air Act requires that all technicians have certification in order to service HVACR equipment. 608 Which type of refrigerant has the highest ozone depletion potential? CFC's HFC's have an ozone depletion potential of _________? 0 A refrigerant's global warming potential (GWP) is based on the ratio of its warminng effect co...

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7 pages

Written in 2024/2025

Grade A+

AnswersCOM

What is energy? - Answer-the capacity of a body to do work What is velocity? - Answer-Rate of change of your position What is acceleration? - Answer-the rate of change of velocity What is compression ratio? - Answer-Discharge divided by suction What is Mass? - Answer-the quantity of matter that a body contains What is force? - Answer-Any action on a body who tends to change: Size, Shape or State What is kenetic energy? - Answer-The ability of a body to do work due to its moti...

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7 pages

Written in 2024/2025

Grade A+

lectknancy

The pump best suited to pump heavy viscous liquids is - Answer-A rotary pump Which type of pump produces the greatest suction? - Answer-a positive displacement pump reciprocating pumps: 1) are high pressure pumps 2) must be primed 3) use mechanical seals 4) should be started with the suction and discharge open - Answer-1 and 4 a volute type pump - Answer-Has a progressively expanding spiral casing. a diffuser pump 1) has stationary guide vanes surrounding the impeller 2) has a ...

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4 pages

Written in 2024/2025

Grade A+

lectknancy

Specific Heat is - Answer-the amount of heat necessary to raise the temperature of a substance one deg F What are two types of heat - Answer-sensible and latent Heat flow by conduction is - Answer-energy travelling from one molecule to another Radiation can be defined as - Answer-transfer of heat through the air without heating the air and is absorbed by a solid object Water freezes at - Answer-32 deg f Refrigeration is - Answer-the tranfer of heat from a place where it is not wan...

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10 pages

Written in 2024/2025

Grade A+

lectknancy

Which is a disadvantage of a packaged indoor unit - Answer-the potential for excessive noise exists Removing oil and filtering refrigerant for reuse is called - Answer-recycle Which is the best description of temperature - Answer-intensity of heat The type of head pressure control in a condenser that helps prevent drops in head pressure is the______ type - Answer-fan cycling, condenser flooding, and damper control Which refrigeration system accessory is used to remove moisture, acid,...

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5 pages

Written in 2024/2025

Grade A+

lectknancy

Safety Study Questions What is the purpose of an SOP? A. To break down the amount of work to be done in a given time. B. To read after the job is done. C. To provide guidance and specific steps necessary to safely operate the system. D. To provide a standard way to perform the job faster. - Answer-C. To provide guidance and specific steps necessary to safely operate the system. Where can a list of the proper PPE needed to safely perform a job task be found? A. SOPs and MPs B. Safety ...

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13 pages

Written in 2024/2025

Grade A+

lectknancy

Automatic expansion valves work with - Answer-Evaporator pressure closes valve spring pressure opens valve A faulty check in a pump will cause the most damage on - Answer-Startup If the T E V's sensing bulb falls off the suction line you will - Answer-Flood the evaporator A clogged condenser pump strainer can cause a loss of pressure causing - Answer-High condenser head pressure A solenoid valve is part of the pump down cycle - Answer-Thermostat solenoid valve and then the low press...

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13 pages

Written in 2024/2025

Grade A+

lectknancy

What is considered a normal box temperature of a walk-in refrigerator - Answer-35-38F What is considered a normal box temperature for a reach in refrigerator - Answer-38-40F What is considered a normal box temperature of a walk-in freezer - Answer--10F What is considered a normal box temperature for a reach in freezer - Answer-0 degrees Fahrenheit How can latent heat in a suction line be transferred to a higher outdoor temperature - Answer-Compress the suction vapor until its condens...

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7 pages

Written in 2024/2025

Grade A+

lectknancy

Which of the following components is unique to reefer refrigeration operation? - Answer-Three-way valve Which of the following is correct concerning the defrost cycle? - Answer-All of the choices are correct. Which of the following are sources of heat that enter the refrigerated area of the trailer? - Answer-All of the choices are correct. Technician A says that controlling the direction of refrigerant flow essentially determines whether the reefer is in cooling or heating mode. Technic...

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2 pages

Written in 2024/2025

Grade A+

lectknancy

An example of a pressure vessel is - Answer-A cylinder containing refrigernat for a refrigeration system If you were a technician about to service an air conditioning system using R-22 refrigerant and the temperature of the refrigerant in the cylinder in your truck was 105*F what would be the pressure of the refrigerant psig in the cylinder - Answer-210.8 A fusible plug is made from - Answer-A material with a low melting temperature When transferring refrigerant from a cylinder to a ref...

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4 pages

Written in 2024/2025

Grade A+

lectknancy

Human Machine Interface (HMI) - Answer-Designed to allow operators to receive operational data and alarms on a screen or a series of screens allowing to make changes to set points or operational expectations. Refrigeration plan capacity must always equal the __________. - Answer-Cooling Load. Control systems respond to: - Answer-Temp, Pressure and Humidity. Temperature-Actuated Control (Thermostat) - Answer-Electric controls can be used for starting and stopping a compressor. A thermost...

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7 pages

Written in 2024/2025

Grade A+

lectknancy

Pressure gauges - Answer-Indicate the conditions inside a refrigeration system. Show evaporator and condenser pressures, they indicate saturation temps. Does CSA B52 require permanently installed pressure gauges on any refrigeration system? - Answer-No, it does not require them. But ammonia systems usually have permanently installed gauges. One to the high side and one to the low side. What should pressure gauges in a refrigeration system be equipped with? - Answer-Pulsation dampeners to p...

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8 pages

Written in 2024/2025

Grade A+

lectknancy