Download RETA Industrial Refrigeration Book 3 Exam 2025 | Complete Questions and Correct Answers and more Exams Refrigeration and Air Conditioning in PDF only on Docsity!
RETA Industrial Refrigeration Book 3 Exam
2025 | Complete Questions and Correct
Answers | Already Graded A+ | Verified
Answers | Just Released
There is a significant difference in procedure and practice when installing cold piping insulation compared to steam or high temperature systems because? (pg. 6 - 15) A) The securing practice for high temperature piping does not require banding a jacket to the insulation B) Exterior jacket choices are limited for high temperature applications C) The type of "cell construction" of high temperature insulation is not important D) The high temp system drives the water vapor away from the pipe --------- CORRECT ANSWER-----------------D) The high temp system drives the water vapor away from the pipe Which of the following can results from untimely or ineffective maintenance of a mechanical insulation system? (pg. 6-7) A) Corrosion under insulation B) Increased life span of the insulation system C) Decreased maintenance costs D) Decreased energy cost ---------CORRECT ANSWER-----------------A) Corrosion under insulation
Inspection of evaporator coils, fans, drain pans, bolts, etc., are part of _________? (pg. 7-2) A) Hazard assessment B) Mechanical integrity C) Non-destructive testing D) Risk management plan ---------CORRECT ANSWER-----------------B) Mechanical integrity After defrost is complete, a large evaporator needs to go through a depressurization phase to prevent? (pg. 7-25) A) Hydraulic shock B) Static pressure C) Bottling up D) Water carryover ---------CORRECT ANSWER-----------------A) Hydraulic shock When defrosting is performed on an evaporator that does not have enough frost on it, the result can be? (pg. 7-25) A) Refrigerant leaks from overheated flange gaskets B) The coil builds ice on the bottom circuit C) Coils clear of frost D) Bridging the defrost drain opening by ice ---------CORRECT ANSWER----------------
- D) Bridging the defrost drain opening by ice
What is NOT an important concern when cleaning evaporators? (pg. 7-4) A) Damage to the fins or tubes of the coil when water is applied too strongly B) Using too high of a temperature cleaning agent that could cause a thermal shock leading to a possible refrigerant release C) The breaking loose of contaminants inside of the coil that will cause restrictions and the loss of capacity D) Using a cleaning agent which is not compatible with the material used in construction of the coil ---------CORRECT ANSWER-----------------C) The breaking loose of contaminants inside of the coil that will cause restrictions and the loss of capacity The most accurate method for setting a metering valve feeding an overfed evaporator would be? (pg. 7-7/8/9) A) To set the valve to get a 0 degree superheat at the outlet of the coil B) To set the hand expansion valve to its midpoint and adjust the valve open or closed to lower the room temperature C) Using the manufacturer's information of the hand expansion valve to calculate the Cv and turns open D) To open the valve to its full open position and then close the valve two turns to keep the other coils from starving ---------CORRECT ANSWER-----------------C) Using the manufacturer's information of the hand expansion valve to calculate the Cv and turns open If you are having problems with the capacity of your condenser, you should check? (pg. 4-22) A) Wet bulb temperature of the inlet air compared to the surrounding area
B) The fit of the eliminators C) Motor horsepower D) For white rust buildup in the condenser ---------CORRECT ANSWER----------------- A) Wet bulb temperature of the inlet air compared to the surrounding area To keep all condensers performing efficiently and safely, they require regular? (pg. 4-9) A) Inspections and maintenance B) Pressure washing C) Acid cleaning D) Replacement ---------CORRECT ANSWER-----------------A) Inspections and maintenance Rust that forms under scale _____________? (pg. 4-20) A) Is insulated from moisture and air such that it ceases to develop B) Can be removed with an acid treatment C) Does not change the heat transfer capability of the condenser tube D) Can lift the scale off the tubing by its expansion ---------CORRECT ANSWER-------- ---------D) Can lift the scale off the tubing by its expansion A matched set of belts are? (pg. 4-23) A) Likely to stretch the same amount when put in service B) As effective as a banded set of belts
D) Are forbidden by code from being used in a conjunction with a PRV as it acts like a closed hand valve ahead of the PRV ---------CORRECT ANSWER----------------- B) Burst at a specific pressure U-1 forms are ____________? (pg. 5-6) A) Required to be on file with the National Board for Unfired Pressure Vessels for retrieval of specific information about the vessel B) To be on display near the vessel it represents C) Manufacture's data reports for the pressure vessel that lists the technical specifications of a manufactured vessel D) Sent to the manufacture's customer when the order for the vessel is placed ---- -----CORRECT ANSWER-----------------C) Manufacture's data reports for the pressure vessel that lists the technical specifications of a manufactured vessel How often must the insulation be removed for inspection from a vessel that works at 20°F year round? (pg. 5-12) A) Every five years in conjunction with the Mechanical Integrity audit require in the PSM program B) When evidence of vapor retarder failure is noted, and even then, the inspection is limited to just the affected area C) Annually during the Standard 6 inspection D) Never, since 20°F isn't cold enough to attract water vapor to the cold surface under the insulation ---------CORRECT ANSWER-----------------B) When evidence of vapor retarder failure is noted, and even then, the inspection is limited to just the affected area
Post Weld Heat Treatment ____________? (pg. 5-8) A) Guarantees that stress corrosion cracking will not occur in an ammonia refrigeration vessel B) Benefits only the heads and shell of a refrigeration vessel C) Is mandatory on all refrigeration vessels D) Helps to prevent stress corrosion cracking in vessels ---------CORRECT ANSWER-- ---------------D) Helps to prevent stress corrosion cracking in vessels Level detecting float switches ____________? (pg. 5-16) A) Are required by code to be wired to directly supply the liquid make up control valve with current to open the solenoid valve B) Are provided with polarity sensitive wiring for D.C. controlled solenoid valves C) Can be adjusted by adjusting the position of the magnetic switch head on the sleeve that protects the attractor attached to the switch's float ball D) Can be used to send control signals to a vessel fill control system --------- CORRECT ANSWER-----------------D) Can be used to send control signals to a vessel fill control system The orifice found at the bottom connection of a float switch assembly ________? (pg. 5-18) A) Can be adjusted to make the switch more responsive on lower temperature systems B) Causes an operating level offset where the vessel operates at a level two inches higher than the level indicated by the float switch
C) The mechanical floats never have operational problems D) Are electronic and you just set them up and forget about them ---------CORRECT ANSWER-----------------A) They stabilize system load swings The two issues listed in the text as causing problems for good level probe operation are? (pg. 5-23) A) Water and air B) Oil and ammonia C) Oil and moisture D) Oil and wiring ---------CORRECT ANSWER-----------------C) Oil and moisture The purpose of the vapor retarder on pipe insulation is to? (pg. 6-3) A) Keep heat from getting into the refrigeration system B) Keep moisture from dripping onto production equipment C) Keep moisture from leaking out onto the roof D) Keep moisture from getting to the pipe and starting corrosion ---------CORRECT ANSWER-----------------D) Keep moisture from getting to the pipe and starting corrosion Ultrasound thicknesses should be compared to thickness of vessels listed on? (pg. 6 - 4) A) The ASME plate B) The shop drawings
C) The U1 forms D) The manufacturer's catalog ---------CORRECT ANSWER-----------------C) The U forms Insulation failure may cause ___________ to grow on the bottom of the refrigeration piping? (pg. 6-5) A) Blue slime B) Algae C) Spores D) Red slime ---------CORRECT ANSWER-----------------B) Algae Because of the importance of a good vapor barrier, insulation repairs for non- destructive testing accesses should be made promptly by? (pg. 6-13) A) Insulation professionals B) Maintenance personnel C) Refrigeration operators D) Plant supervisors ---------CORRECT ANSWER-----------------A) Insulation professionals What is the purpose of an SOP? (pg. 1-3) 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) A safe condition for isolated components ---------CORRECT ANSWER----------------
- A) A possible release How much pressure can build per degree Fahrenheit from hydrostatic expansion? (pg. 1-12) A) Between 50 and 100 PSI B) Between 100 and 150 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, it is the responsibility of who to use the proper PPE? (pg. 1-4) A) As mandated by OSHA regulations for the task B) The owner of the facility C) As stated in the RMP/PSM safety program D) The technician or operator ---------CORRECT ANSWER-----------------D) The technician or operator OSHA regulations require persons wearing respiratory protective equipment to have? (pg. 1-7) A) No mustache B) Rubber boots and gloves
C) A medical evaluation to confirm fitness to wear the PPE D) Side shielded safety glasses ---------CORRECT ANSWER-----------------C) A medical evaluation to confirm fitness to wear the PPE A hot work permit is NOT required if ____________? (pg. 1-7) A) There are no combustible materials where the work is being performed B) You have a person that is designated as a fire watch and have a fire extinguisher ready C) The owner of the property does not require the use of hot work permit D) You are not using a welder or cutting torches, only using a grinder --------- CORRECT ANSWER-----------------A) There are no combustible materials where the work is being performed Lockout/Tagout is required ____________? (pg. 1-10) A) When work is done inside the building B) Only when moving parts can but off body parts or smash fingers C) Anytime work exposes an employee to hazardous energy D) When work is done on the roof ---------CORRECT ANSWER-----------------C) Anytime work exposes an employee to hazardous energy Whose responsibility is it to determine if an area is considered confined space? (pg. 1-11) A) The owner/employer
C) Monthly D) Annually ---------CORRECT ANSWER-----------------D) Annually The primary advantage of using refrigerant instead of water to cool a compressor head is? (pg. 2-20) A) Refrigerant has greater cooling capacity B) Refrigerant is easier to pump C) Refrigerant has lower weight per gallon D) Refrigerant is less expensive ---------CORRECT ANSWER-----------------A) Refrigerant has greater cooling capacity Cooling screw compressors is usually accomplished by cooling the? (pg. 2-22) A) Water B) Refrigerant C) Engine Room D) Oil ---------CORRECT ANSWER-----------------D) Oil After re-aligning the shafts on any driven equipment, it's a good idea to perform? (pg. 2-28) A) A hazard analysis B) An oil change C) A vibration analysis
D) An energy audit ---------CORRECT ANSWER-----------------C) A vibration analysis A compressor's high-pressure cutout set point may NOT exceed ____________% of the associated pressure relief valve's set point? (pg. 2-14) A) 80 B) 90 C) 75 D) 95 ---------CORRECT ANSWER-----------------B) 90 On most compressors, the primary way of separating oil from the discharge refrigerant gas is by reducing the? (pg. 2-45) A) Suction pressure B) Discharge piping size C) Suction temperature D) Discharge gas velocity ---------CORRECT ANSWER-----------------D) Discharge gas velocity Vibration analysis is valuable in predicting compressor? (pg. 2-28) A) Oil flow B) Capacity drop C) Bearing failure D) Oil pressure drop ---------CORRECT ANSWER-----------------C) Bearing failure
Low condensing temperature can lead to? (pg. 2-23) A) Compressor oil cooling problems B) Increased condenser capacity C) Excess fan power consumption D) Compressor slide valve hunting ---------CORRECT ANSWER-----------------A) Compressor oil cooling problems A benefit of properly aligned shaft couplings of screw compressors is? (pg. 2-27) A) Better motor cooling B) Decreased bearing damage C) Increased bhp/TR performance D) Longer shaft seal life ---------CORRECT ANSWER-----------------D) Longer shaft seal life Low oil temperature in thermosyphon cooled compressors can be due to? (pg. 2-
A) Oil buildup in the refrigerant section of the oil heat exchanger B) High load conditions C) A stuck temperature control valve D) Low condensing pressure ---------CORRECT ANSWER-----------------C) A stuck temperature control valve
A screw compressor which loads too quickly will? (pg. 2-8) A) Cause the horsepower required by the compressor to increase rapidly causing motor problems B) Cause the head pressure to increase so fast that it could go off on high discharge pressure C) Cause no problem. It will only keep the suction pressure from rising when there is load increase D) Cause the suction pressure to drop faster than 1 psi per minute leading to cavitation of the ammonia pump ---------CORRECT ANSWER-----------------D) Cause the suction pressure to drop faster than 1 psi per minute leading to cavitation of the ammonia pump Using an oil analysis on a screw compressor to get an indication of the condition of the compressor, you would? (pg. 3-6) A) Take the oil analysis sample from the bottom of the oil separator B) Take the oil analysis sample after the oil pump and before the filter C) Take the oil analysis sample after the oil filter before entering the compressor D) Not use an oil sample analysis because it only told you the condition of the oil - --------CORRECT ANSWER-----------------B) Take the oil analysis sample after the oil pump and before the filter To make sure that the bearings in a screw compressor are being lubricated with oil that is in good condition, you would? (pg. 3-6) A) Take the oil analysis from the oil strained entering the oil pump B) Take the oil analysis sample from a point before the oil filter
