GCAP Operator 1 Practice Exam

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• What is the purpose of checking the suction pressure in a compressor?
• What is the practical maximum compression ratio for a rotary vane compressor?
• What is the role of the highest point inlet in a condenser?
• How much will the PSIG pressure rise for every 1°F of heat exposure in a liquid line?
• How often should an ammonia system be manually purged of non-condensables?
• In a pump overfeed system, which component directly interacts with the liquid feed?
• How should Ammonia be stored to minimize risks?
• During the refrigeration process, what causes the evaporator temperature to drop?
• What type of application are rotary vanes limited to in ammonia refrigeration?
• What is a style of positive displacement compressors used in the industry?
• What is the correct compression ratio if the suction pressure is 33 PSIG and the discharge pressure is 181 PSIG?
• What is a potential issue if the oil levels are too low in a compressor?
• What is the state change that occurs in the condenser?
• If a small percentage of ammonia is absorbed into the oil, what will happen when pressure on the oil is lowered?
• What is one of the most important aspects an operator must check before starting up a compressor?
• Can wet bulb temperature affect the efficiency of an evaporative cooled condenser?
• In which part of the refrigeration cycle does liquid refrigerant change to gas?
• What is Specific Heat (Cp)?
• 54 PSIA equals what pressure in PSIG?
• Which of the following is a style of condenser?
• Can you knock down an Ammonia vapor cloud at atmospheric conditions using water?
• What is another reference to a component of the flooded system?
• Where should a superheated gas exist in all refrigeration systems?
• What is the primary function of an evaporator in a refrigeration system?
• If you say a refrigerant is superheated, what is its phase?
• A Back Pressure Regulator is a?
• Is it true that 1/2% of Ammonia is a deadly concentration?
• What unit is commonly used to measure Specific Heat?
• If an Ammonia receiver can hold 1,000 lbs. of liquid at 90°F, what is the maximum capacity?
• What is Latent Heat?
• What temperature does ammonia boil at under 33 PSIG?
• In a DX coil evaporator, the refrigerant should leave in what state?
• In a refrigeration cycle, what is the function of a condenser?
• What is the fire diamond rating for pure ammonia in terms of health?
• All flooded systems uniquely supply SAT liquid refrigerant to the bottom of the evaporator from which component?
• What is fluid friction or vapor resistance sometimes known as?
• In calculating compression ratio, how is PSIG converted to PSIA?
• What protective gear is essential when working with concentrated Ammonia?
• Which style of compressor can NOT be used in an industrial Ammonia refrigeration system?
• If a home air conditioner is rated to remove 24,000 BTU's in 1 hour, what is its tonnage rating?
• An increase of superheat on the "bulb" of a TXV causes the valve to do what?
• Hydrostatic expansion of ammonia increases pressure by how much per degree of Fahrenheit heat exposure?
• An example of how a lava lamp works would be an example of what type of heat transfer?
• In a refrigeration cycle, what role does conduction play?
• Air (non-condensable gas) in an Ammonia system will NOT cause what?
• What is a potential health hazard of Ammonia at concentrations above the Permissible Exposure Limit?
• Approximately how many BTU's does it take to melt 1 pound of ice to water at 32ºF?
• During the defrosting process, what contributes to the buildup of ice on evaporator coils?
• Is cavitation good for a liquid pump?
• For each pound of water evaporated, how many BTUs does an evaporative condenser reject?
• What formula is used to calculate the volume of a room?
• Are oil and liquid ammonia considered miscible?
• In a DX evaporator, the refrigerant should leave in which condition?
• What is not an accepted technique for NDT (Non-Destructive Testing)?
• What is a sign of a well-functioning ammonia refrigeration system?
• In a system with a -34ºF evaporator and 89ºF condensing, which compressor would be running based on the compression ratio?
• To put a solenoid in AUTO, its stem must be screwed _________
• Is it true that a release of more than 100 lbs of NH3 in 24 hours is reportable?
• The metering or expansion valve controls?
• What is the purpose of a receiver in a refrigeration system?
• What must an operator do if liquid slugging occurs?
• Which compressor type may have safety springs internally for liquid?
• What is the recommended action if an ammonia system's discharge pressure indicates a higher than normal reading?
• What is the typical refrigerant used in many commercial refrigeration systems?
• What should an operator have the ability to do from outside the doors of the engine room?
• During a hot gas defrost cycle, what occurs?
• What does the compressor do in a refrigeration system?
• What are the three liquid feed types?
• Ammonia under 33 PSIG boils at what temperature?
• How many primary types of injury/burns are there with exposure to liquid Ammonia?
• How are temperature and heat related?
• Why is it critical to monitor suction pressure in a refrigeration system?
• If a low temperature Ammonia booster has a discharge temperature drop from 120°F to 80°F, what is indicated?
• Ammonia under 151 PSIG condenses at what temperature?
• Which component is responsible for reducing the refrigerant pressure in a system?
• To classify a metering valve as an actual expansion valve what must happen across the valve?
• Zeotropic and Azeotropic are types of refrigerants that are considered to be?
• In what state is the refrigerant when a line contains Ammonia at 80°F and 120 PSIG?
• At what percentage does the Lower Explosive Limit (LEL) for Ammonia start?
• To check a leak in an Ammonia piping system, what is typically used?
• If an evaporator is rated at 120,000 BTU/HR, what must the condenser be?
• Which pressure unit is defined as absolute pressure?
• What is the primary hazard associated with Ammonia exposure?
• Which option best describes the role of a surge drum in a flooded system?
• What are the two primary methods for detecting small leaks in ammonia systems?
• What is the flash/tax gas in an Ammonia refrigeration system with the evaporator at 10°F and the condenser at 85°F?
• What is a common consequence of high discharge temperatures in a compressor?
• What is the role of a high-pressure cut out switch?
• What key function do expansive devices primarily fulfill in refrigeration systems?
• The compressor controls the low side boiling temperature by controlling:
• When should you track oil in a refrigeration system?
• If you see a green diamond with the number 1005 on a transportation vehicle, what is likely inside the tank?
• Ammonia under 6 PSIG boils at what temperature?
• The process of refrigerant moving from a high-pressure state to a low-pressure state occurs in which component?
• What is flowing through the tubes in a baffled shell and tube exchanger?
• Which compressor is NOT a positive displacement compressor?
• Typically, reciprocating compressors require a minimal differential oil pressure of how much above suction pressure?
• Should you ever put liquid water on liquid Ammonia when the refrigerant is at atmospheric conditions?
• What is the primary role of the condenser in a refrigeration cycle?
• What condition must ammonia be in for pressure/temperature relationship validity?
• If liquid Ammonia gets into your eyes, is the damage usually irreversible?
• 56ºF is equal to what in Celsius?
• True or False: Ammonia is on the EPA toxic chemical list.
• What is the practical maximum compression ratio for a reciprocating compressor?
• What does tonnage refer to in the context of HVAC?
• Why would engineering consider insulating portions of a mechanical refrigeration system?
• Where should you manually purge a condenser when it is not running?
• What could happen if you isolate a pipe full of liquid refrigerant?
• Which protective equipment is crucial when handling liquid Ammonia?
• What happens if an evaporator is starved in a refrigeration system?
• Which condition in refrigeration indicates that the refrigerant is completely vaporized but at the saturated temperature?
• Where should non-condensables be purged from?
• Which evaporator would have the least amount of fins per inch for the operational duties it performs?
• If one dropped suction pressure of a refrigeration system, what would NOT happen?
• What is the equivalent of 100°C in Fahrenheit?
• In an impingement style oil separator, what is the first step of separation?
• Which of the following is not considered a secondary coolant?
• What should you not do with a high-pressure cut out switch?
• What is the reactivity rating color for pure ammonia?
• What is the principle advantage and disadvantage of using Ammonia as a refrigerant?
• What do evaporative condensers derive their heat rejection capability from?
• Which type of burn is NOT primary in the exposure to liquid Ammonia?
• Where can oil be drained from an ammonia system?
• What is the practical maximum compression ratio for a rotary screw compressor?
• Should an operator wear contact lenses when dealing with refrigerant Ammonia according to OSHA?
• Which refrigerant is copper tubing never used with?
• What causes liquid slugging in a compressor?
• What is the color associated with the health hazard rating for pure ammonia?
• What is the recommended action if ammonia vapor is present indoors?
• What is one of the key benefits of utilizing a flooded evaporator system?
• What is the pH level of Ammonia?
• Approximately how many BTU's does it take to convert 1 pound of liquid water at 212ºF to steam at 212ºF?
• An Ammonia refrigerant line at 181 PSIG and 77ºF indicates the refrigerant is:
• Which of the following describes an instance of Convection heat transfer?
• When using a screw compressor with an oil separator, when should the heater operate?
• 1% concentration of Ammonia is equal to what in Parts per Million (PPM)?
• During what process does the evaporator absorb heat?
• In refrigeration systems, which component typically operates at high pressure?
• How many groups of halocarbons are there?
• What is a common cause of liquid slop over in an ammonia refrigeration system?
• What does a higher boiling point of a refrigerant generally indicate?
• In a two-staged system, which compressor should commonly be started first?
• According to OSHA, what is the Permissible Exposure Limit (PEL) for Ammonia?
• In air evaporators tubed with fins, how does the design for colder applications affect the spacing of the fins?
• What component controls the overall high side pressure of a mechanical refrigeration system?
• What percentage marks the Upper Explosive Limit (UEL) for Ammonia?
• What refrigerant condition does 'superheating' refer to in a refrigeration cycle?
• Semi-hermetic pumps have what type of motor connection?
• Compressors are sized based on what requirement?
• What is the general direction of refrigerant flow through every condenser?
• High discharge temperatures in a compressor create which of the following?
• A surge drum of a flooded system is used to...
• BTUs from the product and the heat of compression are rejected at which of the following?
• What pressure scale must be used to calculate Compression Ratio?
• What occurs in a refrigeration system when the pressure is lowered?
• What is a difference between a unit cooler and a blast freezer?
• What process occurs at the evaporator in a refrigeration system?
• 181 PSIG equals what pressure in PSIA?
• What two components are considered as critical as the four major components of a refrigeration system?
• What pressure is indicated when measuring 0 PSIG?
• True or False: The PEL for Ammonia indicates that an operator must wear an Ammonia rated respirator with cartridges in that atmosphere.
• Which compressor is commonly started first in a two-stage system?
• Typically, insulated pipes and vessels are on what side of a mechanical refrigeration system?
• What is the purpose of the heater in an oil separator during operation?
• Where should an auto-purger be piped from on a condenser?
• Typically, how much superheat is found on the outlet of an evaporator under normal load conditions using the overfeed design?
• What is a "King Valve" in refrigeration systems?
• Where is the worst place to have a leak in a refrigeration system?
• Calculate the volume of a room that is 10 feet long, 14 feet wide, and 20 feet high.
• How much heat must be absorbed to convert 1 pound of saturated NH3 liquid to saturated NH3 gas at SAT conditions?
• If the power element of a TXV loses its charge, what would be the result?
• Compressors in HVAC systems are sized based on which requirement?
• Is it safe to proceed through a visible cloud of Ammonia?
• What role does superheat play in a refrigeration system?
• A pressure gauge measures an area of 1 square inch and has a force of 30 pounds. What is the pressure?
• Evaporators can be coolers, freezers, blast freezers, ice machines, etc., what is one common application to them all as the refrigerant absorbs heat?
• An Ammonia refrigerant line at 10 PSIG and -8ºF shows the refrigerant is:
• For an ammonia refrigeration system operating at an evaporating temperature of 17°F and condensing temperature of 89°F, what is the compression ratio?
• What is a common method used to treat Ammonia exposure in the eyes?
• What effect does increasing the load on a refrigerated system typically have?
• What must shut off in the event of all compressors shutting down in a pump overfeed system?
• What does insulation mainly prevent in a refrigeration system?
• What style of system uses liquid pumps to transfer liquid to evaporators?
• If a compressor takes a slug of liquid ammonia and is hydraulically pounding, what should the operator do?
• What must happen to a gas before it can be condensed in a condenser?
• In a system, if the pressure difference indicates non-condensable gases, what steps should be taken next?
• What color is associated with the fire hazard rating for pure ammonia?
• What is the Permissible Exposure Limit (PEL) for Ammonia set forth by OSHA?
• What is Sensible Heat?
• If using a TXV, what style of evaporator are you using?
• How are blades forced outwards in a rotary vane compressor?
• What is the superheat leaving the compressor with a discharge pressure of 165 PSIG and a discharge temperature of 156ºF?
• What is the best response to an Ammonia spill greater than the reportable limit?
• A condenser converts the refrigerant from _____ to _____ when it removes heat.
• What is the function of the King Valve in a refrigeration system?
• A 3% concentration of Ammonia is equivalent to how many parts per million (PPM)?
• What is the primary purpose of Sensible Heat in a mechanical system?
• An Ammonia refrigerant line containing Ammonia at 11" Hg and -20ºF is considered:
• Which of the following components is responsible for turning vapor into liquid?
• Can oil mixed with Ammonia increase the risk of a fire if released with an ignition source present?
• What is the correct response if a worker encounters a leak of Ammonia?
• Changing the pressure upon a refrigerant changes?
• What function does the expansive device serve in a refrigeration system?
• In a recirculation system, where is it important to keep constant pump pressure?
• If you touched a hot ceramic coffee mug with your bare hands, this would be an example of what type of heat transfer?
• What action should an operator take to restore normal operation after slugging occurs in a compressor?
• What is the primary function of a rotary screw compressor?
• What happens to the drive motor when the room temperature goes up to +30°F and then is pulled back down to -10°F?
• Heat flowing through a copper bar with one end in a fire is an example of heat flow by?
• If you say a refrigerant is sub-cooled, what phase is it in?
• What happens to the pressure of the refrigerant in the condenser?
• Which of these statements about Latent Heat is true?
• If you say a refrigerant is SAT, you are saying there is____________
• What is the volume of a cold storage room that is 150' long, 80' wide, and 35' high?
• What is the impact of rapid lowering of suction pressure on a compressor?
• What percentage of Ammonia in the air is considered flammable?
• If one increased superheat on the inlet of a compressor, what would most likely happen?
• What conditions are associated with high head pressure?
• What is one potential risk of overfilling a refrigerant receiver?
• When identifying a compressor, what is the maximum compression ratio for a screw compressor?
• Does Ammonia cause cancer?
• Approximately how many BTU's does it take to convert 1 pound of saturated liquid Ammonia to 1 pound of saturated gas?
• What method is most commonly used to cool oil in compressors?
• If the liquid drain from a condenser is 82°F and the head pressure is 182 PSIG, what could this indicate?
• Which type of compressor is known for being straightforward and easy to maintain?
• What could head pressure be reduced to with proper purging when it is currently 162 PSIG and the condenser liquid drain temperature is 84°F?
• What is the superheat at the inlet of the compressor if the suction pressure is 32 PSIG and the suction temperature is 24ºF?
• What is necessary when working with liquid Ammonia to minimize exposure hazards?
• What type of fan is used to push air through coils?
• What is the function of safety springs in a reciprocating compressor?
• What is the primary purpose of the TXV in a refrigeration system?
• What actuates the capacity control mechanism of a reciprocating compressor?
• A compressor is considered a/an?
• In an Ammonia flooded evaporator, why could oil gather at the lowest point?
• What device regulates refrigerant flow based on load conditions?
• What are the styles of oil cooling for compressors?
• What is the compression ratio of an ammonia refrigeration system operating at 29 PSIG suction pressure and 180 PSIG discharge pressure?
• What happens during hot gas defrost?
• What is essential when measuring refrigerant pressures accurately?
• Most SDS sheets recommend a rinse/flush to body/eyes for a minimum of how many minutes when dealing with Ammonia?
• What is the minimum rinse time required when exposed to liquid Ammonia?
• What is the Immediately Dangerous to Life and Health (IDLH) level for Ammonia according to OSHA?
• Before a condenser can convert gas to a liquid, what must occur to the gas?
• What is the fuel range for pure Ammonia to air concentration?
• Two-stage compression is defined as which of the following?
• Which statement correctly identifies the properties of Ammonia?
• In a flooded system of a shell and tube chiller, what fluid comes in and out of the end caps?
• How do evaporative condensers compare to air-cooled condensers in terms of capacity?
• Is 10 PSIG a greater pressure than 10 PSIA?
• What would be the % of flash/tax gas produced if one pound of liquid Ammonia would convert to gas across the expansion valve with 95ºF condensing temperature and -40ºF evaporating temperature?
• The glow of the sun would be an example of what type of heat transfer?
• Which condition indicates evaporator temperature in the engine room?
• The fuel range for pure Ammonia is _____% to _____%?