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GCAP OPERATOR 2 ACTUAL EXAM NEWSET VERSION -
2025/2026- WITH 100+ QUESTIONS AND VERIFIED ANSWERS
(100% SUCCEESS)
What is CUPL? A) Corrosion Under Pipe Label B) Compressor Under Isolation and Locked C) Condenser Under Isolation and Locked D) None of the above A) Corrosion Under Pipe Label What is the common acronym for best practices? A) IIAR B) RAGAGEP C) ASHRAE D) ASME B) RAGAGEP (Recognized and Generally Accepted Good Engineering Practices) What is CUI? A) Corrosion Under Insulation
B) Compressor Under Isolation C) Condenser Under Isolation D) None of the above A) Corrosion Under Insulation How much pipe loss is allowed by IIAR before they recommend subjective analysis? A) 5% B) 10% C) 15% D) 20% B) 10% When taking an upcharge of Ammonia, what is the most water concentration that should be in the Ammonia to be called anhydrous or refrigeration grade? A) 100 PPM B) 500 PPM C) 1,000 PPM D) 5,000 PPM B) 500 PPM
Thermal Conductivity, also known as "K" value, is what? A) A scientific measurement to the number of BTU's that will pass in one hours, through a material 1" thick, with an area of 1ft2, if the temperature difference from one side to the other is 1°F B) Exactly the same results for all materials C) A measure of total energy D) Theoretical measurement used to calculate discharge temperatures A) A scientific measurement to the number of BTU's that will pass in one hours, through a material 1" thick, with an area of 1ft2, if the temperature difference from one side to the other is 1°F Which of these would be a better resistor to heat transfer? A) Steel B) Aluminum C) Stainless Steel D) Saw Dust D) Saw Dust What is true about "K" value and "R" value? (What's the difference?) "K" value is a materials ability to transfer heat (conductor) "R" value is a materials ability to NOT transfer heat (insulator) Understanding the "U" Factor means that a good operator will do what?
A) Only consider if the system is maintaining temperature B) Make sure there is no impeding substance such as ice, dirt, oil on the surfaces of heat exchangers daily C) Make sure the compressors are not at maximum compression ratio D) Use maximum airflow across the coil B) Make sure there is no impeding substance such as ice, dirt, oil on the surfaces of heat exchangers daily How many BTU's will be required to be removed from the carrot to drop to the following desired temperature? 7,000 lbs. of carrots are 95°F and need to be cooled to 36°F The specific heat of a carrot above freezing is 0.94 BTU/lb. and below freezing is 0.48 BTU/lb. A) 198,249 BTU's B) 240,189 BTU's C) 220,833 BTU's D) 388,220 BTU's Sensible Heat = Mass x Specific Heat x (T1 - T2) 7,000 x 0.94 x (95 - 36) 7,000 x 0.94 x 59 = 388,220 BTU's Ammonia is at the following conditions, 85°F and 140 PSIG. What is the condition of the refrigerant? A) SAT
Suction Pressure- 33 PSIG Suction Temp- 34°F Discharge Pressure- 152 PSIG Discharge Temp- 175°F Oil Pressure- 45 PSID Motor PF- 0. A) 34°F B) 20°F C) 14°F D) 10°F Superheat = (actual suction temp - suction pressure SAT temp) Superheat = 34°F - 20°F (33 PSIG Superheats at 20°F) Suction Superheat = 14°F What is the superheat on the outlet of this compressor? Suction Pressure- 33 PSIG Suction Temp- 34°F Discharge Pressure- 152 PSIG Discharge Temp- 175°F Oil Pressure- 45 PSID Motor PF- 0. A) 90°F B) 152°F C) 223°F D) 175°F Discharge Superheat = (actual discharge temp - discharge pressure SAT temp) Superheat = 175°F - 85°F (152 PSIG Superheats at 85°F) Discharge Superheat = 90°F
What is the superheat on the inlet of both compressors? Low Stage: High Stage: Suction Pressure- 9" Hg Suction Pressure- 31 PSIG Discharge Pressure- 31 PSIG Discharge Pressure- 154 PSIG Suction Temp- - 31°F Suction Temp- 24°F Discharge Temp- 135°F Discharge Temp- 156°F Superheat = (actual suction temp - suction pressure SAT temp) Low Stage Superheat = - 31°F - - 21°F (9" Hg Superheats at 21°F) Low Stage Superheat = 10°F High Stage Superheat = 24°F - 18°F (31 PSIG SAT = 18°F) High Stage Superheat = 6 °F The liquid drain temperature of an Ammonia condenser is 80°F and high side pressure is 138 PSIG. How many PSI of non-condensables are present in the system? A) 0 PSI B) 10 PSI C) 16 PSI D) 138 PSI 80°F = 138 PSIG on SAT chart which matches our pressure so... A) 0 PSI
A) The science and study of the air and the water that it contains at atmospheric conditions Another term for dew point would be? A) Evaporation B) Compression C) Expansion D) Condensation D) Condensation The naked psychrometric chart will show at least how many variables of air and water at atmospheric conditions? A) 3 B) 5 C) 7 D) 9 C) 7 The naked psychrometric chart has how many unique angles for the variables? A) 3 B) 5 C) 7
D) 9
B) 5
Out of the variables that most psychrometric charts will show, which ones can actually be measure by an instrument? A) Dry Bulb, Wet Bulb, Enthalpy B) Dry Bulb, Wet Bulb, Relative Humidity C) Dry Bulb, Humidity Ratio, Enthalpy D) Dry Bulb, Humidity Ratio, Relative Humidity B) Dry Bulb, Wet Bulb, Relative Humidity Moving center horizontally will be a __________ heat exchange while moving center vertically will be a __________ heat exchange to the water that is contained in the atmosphere? A) Latent/Sensible B) Sensible/Latent C) Sensible/Sensible D) Latent/Latent B) Sensible/Latent What is the Wet Bulb Temperature when given the following? Dry Bulb Temperature- 90°F Relative Humidity- 30%
What is the Relative Humidity when given the following? Dry Bulb Temperature- 80°F Wet Bulb Temperature- 70°F A) 61% B) 71% C) 85% D) 95% Relative Humidity = 61% What is the Enthalpy when given the following Dry Bulb Temperature- 50°F Relative Humidity- 30% A) 4.5 BTU's/lb. B) 14.5 BTU's/lb. C) 24.5 BTU's/lb. D) 34.4 BTU's/lb. Enthalpy = 14.5 BTU's/lb. What is the Humidity Ratio when given the following? Dry Bulb Temperature- 100°F Relative Humidity- 60% A) 116 grains B) 136 grains C) 156 grains
D) 176 grains Humidity Ratio = 176 grains What is the Specific Volume when given the following? Dry Bulb Temperature- 120°F Relative Humidity- 25% A) 13ft3/lb. B) 14ft3/lb. C) 15ft3/lb. D) 16ft3/lb. Specific Volume = 15ft3/lb. What is the Dew Point when given the following? Dry Bulb Temperature- 70°F Relative Humidity- 40% A) 45°F B) 50°F C) 55°F D) 60°F Dew Point = 45°F What is the Enthalpy when given the following? Dry Bulb Temperature- 90°F Humidity Ratio- 106 grains
A basic vapor pressure curve is a diagram considering what two variables to create the unique curve? A) SAT Pressure and Temperature B) Enthalpy and Entropy C) PSIG and Specific Volume D) BTU's and Theoretical Discharge Temperatures A) SAT Pressure and Temperature A basic definition of Enthalpy is? A) A measure of heat energy in BTU's B) Latent heat of evaporation C) Latent heat of condensation D) Heat that cannot be measured A) A measure of heat energy in BTU's A refrigeration system plotted within an Enthalpy diagram illustrates? A) Heat of compression only B) The flash/tax gas percentage only C) The changes of condition and heat content of the refrigerant at different points of the refrigeration cycle D) Latent heat of evaporation and latent heat of condensation cycles
C) The changes of condition and heat content of the refrigerant at different points of the refrigeration cycle An Enthalpy diagram has three regions known as? A) Sub-Cooled Liquid, SAT, and Superheated Gas B) Hot, Cold, and SAT C) Flash/Tax Gas, Sub-Cooled, and Superheated D) High, Low, and SAT A) Sub-Cooled Liquid, SAT, and Superheated Gas How does the temperature lines run within the Sub-Cooled and Superheated regions of the enthalpy diagram? A) Vertical B) Horizontal C) Sub-Cooled run vertical and Superheated run horizontal D) Sub-Cooled run horizontal and Superheated run vertical A) Vertical How does the temperature lines run within the SAT region of an enthalpy diagram? A) Vertical because change of state of a refrigerant at constant pressure is done at a constant temperature
D) Multiplies C) No Change What is NOT Mechanical Integrity? A) Housekeeping B) Inspections/Tests C) Permit Process D) Preventive and Predictive Maintenance C) Permit Process Using an Enthalpy Diagram, what is the theoretical discharge temperature of the compressor including suction superheat? Suction Pressure - 33 PSIG Condenser Liquid Temp - 85°F Discharge Pressure - 152 PSIG Condenser Outlet Pressure - 151 PSIG Suction Temp - 34°F Discharge Temp - 175°F A) 180°F B) 194°F C) 175°F D) 200°F Suction Superheat = Actual Suction Temp - SAT Temp Suction Superheat = 34°F - 19°F (33 PSIG Superheats at 19°F) Suction Superheat = 15°F 194°F
Using an Enthalpy Chart, what is the latent heat of evaporation at - 20°F? A) 561 BTU's B) 583 BTU's C) 600 BTU's D) 635 BTU's B) 583 BTU's Calculate the Flash/Tax gas percentage with a condensing temperature of 85°F and evaporation temperature at 0°F assuming the latent heat of evaporation is 561 BTU's. A) 12.9% B) 14.9% C) 16.9% D) 18.9% Flash/Tax Gas = (T1 - T2) x 1.12 / 561 Flash/Tax Gas = 85 x 1.12 / 561 Flash/Tax Gas = 16.9% What is total heat rejection? A) The total heat removal needed from the mechanical refrigeration system B) Latent heat of condensation C) De-Superheating
