RETA Ammonia Refrigeration Compliance Guideline Prep Test, Exams of Refrigeration and Air Conditioning

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RETA Ammonia Refrigeration Compliance Guideline Prep Test

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 alter the job is done. C. to provide guidance and specific steps necessary to safely operate the system. D. Lo provide a slandard way to preform the job fas! provide guidance and specific steps necessary to safely ope Where can a list of the proper PPE needed to safely preform a job task? A. SOPs and MPs B. Safety data sheet C. risk management plan D.Hazardous material business plan A. SOPs and MPs Which of the following requires hot work permits? A. The local fire department B. OSHA regulations C. The HR department What can be caused by trapped liqnid? A.a possible release - CORRECT ANSWER. to B. Excess refrigerant flow C. The em to pump down D. A safe condition for isolated components - A. A possible release How much can the pressure of trapped liquid increase per degree Fahrenheit of temperature increase A. Between 50 and 100 psi B. Between 100 and 130 psi C. Between 180 and 190 psi D. Between 200 and 300 Psi- CORRECT ANSWER-B. Between 100 and 150 psi When working on an ammonia refrigeration system, which of the following has the responsibility to use the proper PPE? A\. As mandated by EPA regulations B. The owner of the facility C. The HR department D. The technician or operator - CORRECT. OSHA regulations require persons wearing respiratory protective equipment to have A. no mustache B. rubber boats and gloves C. a medical evaluation to confirm fitness 1a wear the PPE. D. side shielded safety glasses a medical evaluation to confirm fitness to wear the PPE. C. conform tot he OSHA regulations for electrical gear. D. confirm that the energy source has indeed been made safe. - CORRECT ANSWER-D. confirm that the energy source has indeed been made safe. During an are flash event, hat is the conductor? A. hard rather than soft rubber shoe soles B. The disconnect handle C. The water in a hase that is too close D. The air- C ANSWER-D. The air As an ask flash fault continues, the are explosion expansion is estimated to be how large? A. 40,000 to 1 B. relatively small compared to mot explosions C. about the same size as a typical ammonia explosion D. 10 atmospheres - C! ANSWER-A. 40,600 to 1 What is the purpose ofa refrigeration system? a. To freeze food b. To cool buildings c. To preserve food d. To maintain a temperature - CORR! - CORRECT ANSWER- Operators must keep refrigeration systems operating safely and term-69efficiently. Which of the following best describes the areas of required knowledge for this to be possible? a. Basic physical principles, interpretation of information from temperature and pressure gauges, basic operating principles. b. Basic physical principles, interpretation of information from temperature and pressure gauges, manufacturer of the equipment ce. Interpretation of information from Lempcrature and pressure gauges, basic opcraling principles, company quality control policies and procedures. d. Interpretation of information from temperature and pressure gauges, manufacturer of es and procedures. - CORRECT ANSWERa. Basic physical principles, interpretation of information from temperature the equipment, company quality control polici: and pressure gauges, basic operating principles. Mechanical refrigeration is a series of steps that a. moves heat energy from a space or object to an area where it can do no harm. b. adds cold to a space or object. c. transforms heat energy into cold energy to reduce the temperature of the area ta be cooled. d. utilizes the cooling effect of compressing a gas to reduce mperature in a space or object. - CORRECT ANSWER-a. moves heat energy from a space or object to an area where it can do no harm. Heat energy always flows a. fromm a subslance wilh mare hoal. cnorgy Lo a substance with loss heat energy. b. regardless of temperature. c. from an object at a higher temperature to an object at a lower temperature. How does the refrigeration technician/operator know what the conditions are within a refrigeration system? a. By using his knowledge of system basic operating principles to evaluate temperature and pressure readings. b. By observing the alarm annunciator panel, ifno alarms are displayed the system is operating efficiently and correctly. c. By keeping the discharge and suction pressures within specification the operator assures proper system operation. d. By observing product temperature, if the product is at temperature the system is operating properly. - CORRECT ANSWER-a. By using his knowledge of system basic operating principles to evaluate temperature and pressure readings What is the scale used to measure Fahrenheit temperature absolut a. Extreme b, Rankine c. Celsius d. Kelvin - CORRECT ANSWER-b. Rankine Which of the following is used Lo measure the quantity of heal. cnergy? a. British Thermal Units (BTUs) or calories b. Pascals and Kilopascals c. Degrees Kelvin d. Degrees Celsius or Fahrenheit - (BTUs) or calories When calculating the BTUs that have to be removed to change the temperature of a substance, what combination of the following is used? a. Pounds of substance, sensible heat. temperature. b. Pounds of substance, temperature difference, specific heat. c. Pounds of substance, heat of cooling, change of state. d. Pounds of substance, latent heat, heat of refrigeration. - CORRE’ Pounds of substance, temperature difference, specific heat. Latent heat of vaporization a. is calculated using temperature. b. is always going to raise the temperature of the liguid it is trying to boil. c. is the heat energy required to cause a liquid to become a vapor. d. is the same for all liquids. - C ‘Fc. is the heat energy r cause a liquid to become a vapor Pressure is a measure of a. Lhe action scen from the allraction of gravity. b. weight. c. the relationship of a force being applied over a given area. d. the distance between the top of the piston and the discharge valve of a reciprocating -e. the relationship of a fore being applied over a compressor. - given area. What is the relationship between temperature difference and heat flow? a. There is no relationship between Lemperature and heal. flow. b. The greater the temperature difference, the slower heat flows. Using the vapor pressure curve for ammonia, 70° F equals approximately what value? a. 38 psig b. 40 psia c. 70 psig d. 114 psig - CORR! Thirly-lLwo psia equals a. 46.7 psig. b. 17.3 psig. ¢. 3.2 in. Hg Vacuum. d. 760 mm Hg. - CORREC The pressure midway between 0 psia and O psig is a. 7.35 psia. b. 7.35 psig. ¢. 7.35 in. Hg Vacuum. dO in. Hg Vacuum. - CORR: Which of the answers below is an example of heat transfer by conduction? a. Tho sun’s rays. b. Arod heated on one end becoming warm at the other end. c. Product being frozen in a blast freezer. d. Heat felt from a campfire when standing upwind - ¢ b. Arod heated on one end becoming warm at the other end. If specific heat for air is 24 BTU/b./F and the specific volume is 12.7 cu. ft./lb., how much heat energy must be removed to cool the air inaroom that is 16° < 12° Xx 8 fram 70° F to 40° Fe a. 140,452 BTUS b. 1,536 BTUs c. 29BTUs d. 870.8 BTUs - CORRE! INSWER-d. 870.8 BTUs The condition of a boiling liquid is a. always hot. b. superheated. c. subcooled. d. saturated. - CO, \INSWER-d. saturated A gallon of milk weighs 8 pounds. If it leaves the cow at 90° F and must be cooled to 35” F, how many BTUs must be removed in the cooling process? a. 409.2 BTU b. 40.9 BTU ¢. 440 BTU d. 51.15 BTU - CORRECT ANSWER. 409.2 BTU A meat plant processes 100 animals a day with an average processed weight of 730 pounds of becf per animals. The meal. mus!. be cooled to 45° F from 85° F. How many BTUs must be removed in the cooling pracess? a. 3,000,000 (Use the specific heal. of sirloin steak). a. Energy content only changes with a change in temperature. b. Energy is created when a substance is heated up. c. Energy cannot be created or destroyed. d. Total energy in a substance is a function of its physical size. - CORRECT ANSWER- c. Energy cannot be created or destroyed. -40" F is equal to a. -40° © b.40° © 6. 0° K d.-32" R- CORRECT A. What is the freezing point of water? a.-32° F b.32° C c. 32° F d.0° F- CORRECT ANSWER +c. 32° F Ifa liquid below its saturation temperature, what is its condition? a. Superheated b. Subeooled c. Saturated d. Vaporized - { b. Subcooled Why does the refrigerant in the condenser change state from vapor to liquid? a. The pressure is decreased by the compressor. b. The refrigerant runs down into the receiver. c. The refrigerant loses heat energy to the surrounding environment. aturation. - CORRECT ANSWER-c. The y to the surrounding environment. » fans increase the pressure to abov erant loses heat € Which item does the expansion valve control? a. The flow of liquid into the evaporator. b. The pressure in the evaporator. c. The pressure in the reeciver. d. The system operating pressure. - CORRECT ANSWER-a. The flow of liquid into the evaporator. Which of the following statements is true? a. 10 psia is a greater pressure than 10 psig. b. 10 psig is equal to 19 psia. c. 10 pig is a greater pressure than 10 psia. d. 10 psig and 10 psia use different scales and therefore cannot be compared in this way. - ERc. 10 pig is a greater pressure than 10 psia. Flash gas is a. the gas created at the expansion device. b. the gas used Lo defrost evaporators thal. use gas defrost sysloms. c. the gas created anytime liquid refrigerant evaporates. Saturated conditions are found _ a. only in a condenser. b. only in an evaporator. c¢. only in the liquid lines. d. in both an evaporator and a condenser. - CORRECT ANSWER-d. in both an evaporator and a condenser. Flash gas is__ a. only found in ammonia refrigeration systems. b. formed in a high pressure rceciver. c. formed in a condenser. d. formed at the point of expansion. - d. formed at the point of expansion. What are the four necessary components of a mechanical refrigeration system? a. Evaporator, condenser, ret er, COMLpr or b. King Valve, gauges, thermometers, amp meter c. Expansion device, evaporator, compressor, condenser d. Evaporator, condenser, King Valve, compressor - C ‘R-c. Expansion device, cvaporator, comprossor, condenser Lom is considered ‘\ conventional mechanical refrigeration sy a. an expendable refrigerant system. b. a closed loop system. ¢. an open loop system. d.a multi-loop system. ~b. a closed loop sy Superheat is found at which points ofa typical system? a. The compressor suction and the liquid line. b. The compressor suction and high pressure receiver inlet. c. The condenser outlet (CD) line. d. The compressor suction and compressor discharge line. - ¢ The compressor suction and compressor discharge line. Which of the following is NOT a true statement about heat of compression? a. It happens to all refrigerant vapors in mechanical refrigeration systems. b. It is the energy that is applied to the vapor by the compressor reducing the volume. c. It is one reason why a condenser must be sized larger than just the evaporator load. d. It improves the operating efficiency of most systems by improving the condensing rate. - CORRECT ANSWER-d. It improves the operating efficiency of most systems by improving the condensing rate. In an operating ammonia refrigeration system, subcooled refrigerant can only be a a. solid. b. liquid c. Wapor. a. 8.75:1 b. 5.46:1 ¢. 1131 d. 7.7.1 - CORRECT ANSWER-b. 5.46:1 What is one advantage to having evaporator pressures higher than atmospheric pressure? a. Gauges scaled for psia are more expensive than gauges scaled [or psig. b. Higher pressures in the evaporator mean colder room temperatu c. Higher pressures keep air ont of the system. d. There is no advantage to evaporator pressures that are higher than atmospheric. - c. Higher pressures keep air out of the system. What are two refrigerants that are blended to create a new refrigerant with its own properties called? a. HCFC refrigerants b. A zeotrope or an azeotrope c. CFC refrigerants d. Water-based refrigerants - -b. A zeotrope or an azeotrope Discharge temperature should not be so high it a. causes the evaporative condenser water to evaporate. b. causes breakdown of the compressor lubricating oil. c. heats up the suction port. d. makes the refrigerants pump cavitate. - CORRECT ANSWEF-D. causes breakdown of the compressor lubricating oil. What factor do you multiply the mass flow rate (Ibs./min.) by to determine the vapor flow rate through the compressor? a. Density (Ibs./cubic ft.) b. Specific volume (cubic ft./1b.) c. Capacity (BTU/min.) d. Velocity (ft./min.)- CORRECT ANS Three factors to consider when choosing a refrigerant are a. molecular weight, availability, and safety. b. refrigeration effect, cost, and viscosity. c. cost, availability, and safety. d. cost, availability, and refrigeration coefficient. - CORR. ANSWER. cost, availability, and safety. How much does the pressure of trapped ammonia liquid change? a. 1 psi per 100° to 150" F increase. b. 100 ta 150 psi per degree Fahrenheit increase. c. 1 psi per 100" to 150° F decrease. d. 100 Lo 150 psi per degroo Fahrenheit deerease. - CORRECT ANS psi per degree Fahrenheit increase. WER-b. 100 to 150 What is one positive characteristic of most halocarbon refrigerants?