GCAP Industrial Ammonia Refrigeration Training Practice Test

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• What is the range for the Upper Explosive Limit (UEL) for ammonia?
• What is the direction of flow through every condenser?
• What happens if the system pressure is too high in a refrigeration system?
• Zeotropic and Azeotropic are types of refrigerants that are considered to be?
• How much heat must be absorbed to convert 1 pound of saturated NH3 liquid to saturated NH3 gas?
• What role does an expansion valve play in a refrigeration system?
• What does two-stage compression in ammonia refrigeration involve?
• How much will pressure rise for every 1°F of heat exposure in an ammonia liquid line with trapped liquid?
• What is the typical outcome of heat absorption by the evaporator?
• What is the PSIG equivalent of 54 PSIA?
• What is the fire diamond color designation for Ammonia's reactivity rating?
• What is the practical maximum compression ratio for a reciprocating compressor?
• Where should a superheated gas be located in refrigeration systems?
• In a two-stage ammonia refrigeration system, which compressor is generally started first?
• In a DX or dry expansion coil evaporator, the refrigerant should leave in what state?
• What style of compressors is commonly used in industrial ammonia refrigeration systems?
• If one dropped suction pressure of a refrigerant system, what would be the expected outcomes?
• What is a common method to detect small leaks in an Ammonia system?
• Rotary veins in ammonia refrigeration are primarily used for what type of application?
• What is the definition of sensible heat?
• What could indicate a problem in the condenser's operation when measuring outlet drain temperature?
• If using a TXV, which type of evaporator is typically employed?
• What is latent heat?
• A compressor is primarily described as what type of device?
• What could occur when isolating a pipe or vessel filled with refrigerant?
• In which system would you expect to find a surge drum?
• Which tool is commonly used to check for leaks in an ammonia piping system?
• Which evaporator has the least amount of fan space per inch for the operational duties it performs?
• Under what condition is the mass capacity of an ammonia receiver measured?
• What is the role of a solenoid valve in ammonia refrigeration systems?
• When should oil be tracked in a refrigeration system?
• Is Ammonia classified as a carcinogen?
• According to PEL for ammonia, what should an operator wear if they want to stay in that atmosphere?
• Which term best describes heat transfer that affects temperature without changing physical state?
• What are the conditions in a refrigerant line containing ammonia at 80°F and 120 psi G?
• What type of heat transfer describes the warmth felt from a hot lamp?
• What function does the entire refrigeration cycle serve in industrial settings?
• What is the primary component of an ammonia refrigeration system?
• What is likely to happen if superheat is increased at the inlet of the compressor?
• What happens in the evaporator during normal operation?
• What is required to prevent liquid from reaching the compressor?
• What is the fuel range for pure ammonia in terms of its concentration?
• The role of the mechanical shaft seal is primarily to:
• What is a common issue when a solenoid valve leaks in an ammonia system?
• Where do you manually purge a condenser when it is off?
• What is the pressure rating assigned to the fire hazard of pure Ammonia?
• In a mechanical refrigeration system, where are insulated pipes and vessels typically located?
• What type of pressure change does a compressor create in a refrigeration system?
• Is a release of more than 100 pounds of NH3 in 24 hours reportable?
• How much will hydrostatic expansion increase pressure per degree Fahrenheit for Ammonia?
• What is fluid friction in the context of vapor resistance?
• A pressure gauge measures a force of 30 pounds on an area of 1 square inch. What is the pressure in PSI?
• What defines the pressure drop in a refrigeration system?
• For each pound of water evaporated, how many BTUs does an evaporative condenser typically reject?
• Can oil mixed with ammonia increase the risk of fire if an ignition source is present?
• When does excess lubricating oil in a compressor lead to slugging?
• What is considered a safe level of Ammonia exposure for workers to avoid immediate harm?
• Is it safe to proceed through an invisible cloud of ammonia?
• What state change occurs as the refrigerant absorbs heat in the evaporator?
• What happens to pressure in an ammonia system when the temperature rises due to heat exposure?
• If an evaporator is rated at 120,000 BTU/HR, what must be true about the condenser?
• In a screw compressor, how should the heater associated with the oil separator operate?
• Where should an automatic purger be piped from on the condenser?
• What happens to the refrigerant in the condenser during operation?
• What type of fan is typically used to push air through coils in ammonia refrigeration systems?
• What is a potential hazard of excessive heat when isolating a filled vessel?
• What is the primary function of a condenser in a refrigeration system?
• What happens to a system if it is filled too much at the wrong temperature?
• What is the role of the condenser in a refrigeration cycle?
• In which section of a refrigeration system is the worst place to have a leak?
• What type of refrigerant system uses a surge drum to supply refrigerant?
• Is 10 PSIG greater than 10 PSIA?
• What is the main advantage of using positive displacement compressors in industrial refrigeration?
• To determine the boiling point of a refrigerant, which property must you consider?
• What must shut off in a pump overfeed system if all compressors shut down?
• Why is insulation important in a mechanical refrigeration system?
• To put a solenoid in AUTO, its stem must be screwed _____________.
• Which of the following is NOT a type of positive displacement compressor?
• What is the volume of a cold storage room that measures 150 feet by 80 feet by 35 feet?
• Which of the following is NOT an acceptable technique for Non-Destructive Testing (NDT)?
• What is the primary function of a surge drum in a flood system?
• Where does the heat of compression or rejected BTUs occur in a refrigeration cycle?
• How are blades forced outwards in a rotary vane compressor?
• What happens to moisture at temperatures below -32°F in evaporator systems?
• What is the primary reason for purging a condenser manually?
• Which of the following conditions can lead to fast thermal shock in an evaporator?
• Which component is responsible for controlling the overall high-side pressure in a mechanical refrigeration system?
• What happens to the drive motor when the room temperature is raised to +30°F and then pulled back down to -10°F?
• Where does a flooded system typically supply SAT liquid refrigerant to?
• What is the concentration of Ammonia in parts per million at 1%?
• How many primary types of injury are associated with exposure to liquid Ammonia?
• Which method would be the most effective in assessing the condition of a pipeline?
• Heat conduction is illustrated by which of the following examples?
• In a recirculation system, where is it most crucial to maintain a constant pump pressure?
• As systems are designed for colder applications, what change occurs to the spacing of the fins in an air evaporator?
• What occurs during a hot gas defrost cycle?
• How do you convert 181 PSIG to PSIA?
• If the discharge vapor temperature of a low-temperature ammonia booster compressor suddenly drops to 80°F, what does this indicate?
• Which type of evaporator is specifically designed for deep freezing applications?
• Which of the following best describes a condenser's operational change?
• In a refrigeration cycle, what happens to refrigerant as it passes through the condenser?
• In a DX or dry expansion evaporator, in what condition should the refrigerant leave?
• What criteria must occur across a metering valve for it to be classified as an actual expansion valve?
• What are the steps of separation in an impingement style oil separator?
• What is the practical maximum compression ratio for a rotary vane compressor?
• What is the primary purpose of a compressor in an ammonia refrigeration system?
• In refrigeration, what does a high pressure receiver typically indicate?
• Why is it important for the refrigerant to be in a superheated state as it leaves the evaporator?
• Which component of the refrigeration system is responsible for absorbing heat?
• How do evaporative condensers achieve heat rejection?
• From which part of an ammonia system can oil be drained?
• What is the practical maximum compression ratio of a rotary screw compressor?
• Can wet bulb temperature affect the efficiency of an evaporative cooled condenser?
• In refrigeration applications, how do evaporators function regarding refrigerant?
• When the pressure of a refrigerant increases, what typically happens to its boiling point?
• If the power element of a thermostatic expansion valve loses its charge, what is a likely consequence?
• Is it true or false that high discharge temperatures are good for a compressor, creating a black sooty deposit?
• What type of energy transfer involves the flow of heat through direct contact?
• In a refrigerant line containing Ammonia at 181 PSIG and 77°F, what is the condition of the refrigerant?
• Changing the pressure upon a refrigerant affects which of the following?
• What condition does the refrigerant have when it is at 10 PSIG and -8°F?
• What are the potential causes of liquid slugging in a compressor?
• Compressors are sized by which of the following requirements?
• What happens during the change of direction in the separation process of an impingement style oil separator?
• In a two-stage system, which compressor is typically started first?
• How does a unit cooler differ from a blast freezer?
• If a refrigerant is at the Saturation (SAT) point, there is a combination of what?
• At what percentage does the Lower Explosive Limit (LEL) for ammonia start?
• In refrigeration terms, what is tonnage a measure of?
• What is the common effect of increased superheat on compressor performance?
• Which property describes the ability of a compressor to move vapor only?
• What is the minimum required rinse/flush time for the body/eyes according to MSDS sheets when dealing with Ammonia?
• The capacity control mechanism of a compressor is actuated by what?
• What does the compressor control to manage the low side boiling temperature?
• In which part of the refrigeration system is the refrigerant cooled before it's circulated back to the evaporator?
• What is the equivalent of 100°C in Fahrenheit?
• What is indicated by the use of safety springs in reciprocating compressors?
• Before gas can be converted to liquid in a condenser, what must occur?
• What are the three types of feeds in refrigeration systems?
• What is the purpose of the King valve in an ammonia refrigeration system?
• Which three styles of positive displacement compressors are used in the industry?
• Which of the following is a style of oil pulling for compressors?
• Air (non-condensable gas) in an ammonia system will not cause what?
• Compressors in refrigeration systems are primarily sized based on which requirement?
• Calculate the compression ratio given a suction pressure of 33 PSIG and a discharge pressure of 181 PSIG.
• How does an overfeed system primarily operate in terms of refrigeration efficiency?
• Which type of compressor may contain safety springs internally for liquid?
• What does PSIG stand for?
• How many tons does a home air-conditioner rated at 24,000 BTUs in one hour represent?
• Under what condition is the pressure/temperature relationship for ammonia valid as per a PT chart?
• What is an advantage of using ammonia as a refrigerant?
• What is the expected behavior of refrigerant as it passes through the expansion device?
• Approximately how many BTU's does it take to melt 1 pound of ice to water at 32°F?
• What is a primary type of injury caused by liquid Ammonia exposure?
• Does liquid Ammonia exposure result in irreversible eye damage?
• Which of the following is NOT considered a secondary coolant?
• What is a typical cause of liquid slop over in an ammonia refrigeration system?
• What pressure scale must be used to calculate a compression ratio?
• What should an operating engineer do in the event of liquid slugging?
• What happens to evaporative cooled condenser performance on hot days?
• What is the main function of the expansion device in a refrigeration system?
• Which condition monitored in the engine room typically indicates evaporator temperature?
• What is the permissible exposure limit (PEL) for ammonia as set forth by Federal OSHA?
• If a refrigerant is described as sub-cooled, what does that mean?
• What type of pumps have an external motor connected to the armature with a mechanical shaft seal?
• Another term for the flooded system is?
• Why is it important to De-superheat gas before it enters a condenser?
• Which factor contributes to effective thermal insulation in a refrigeration system?
• Ammonia has what effect when it comes in contact with water?
• What is typically controlled by the expansion device in the refrigeration cycle?
• What is the function of a King Valve in a refrigeration system?
• If you touch a hot ceramic mug, what type of heat transfer is occurring?
• The glow of the sun is an example of which type of heat transfer?
• Which injury type is NOT associated with liquid Ammonia exposure?
• What type of tubing is never used with ammonia?
• What is the significance of PSIA in measuring pressure?
• If the liquid drain from the condenser reads 82°F and the head pressure is 182 psi G, what does this indicate?
• If one pound of liquid ammonia converts to gas, what percentage of gas is produced across the expansion valve given specific temperature conditions?
• What physical property of a refrigerant is primarily affected by sensible heat?
• What is an example of an application where evaporators are commonly used?
• Should an operator wear contact lenses when dealing with refrigerant ammonia?
• What is the pH value of Ammonia?
• What is one of the most important aspects that an operator must check before starting up a compressor?
• Which system type utilizes a liquid pump to transfer liquid to evaporators?
• The metering or expansion valve is responsible for controlling which aspect of the refrigeration process?
• What operational feature differentiates a semi hermetic pump from other types?
• What property of oil contributes to its gathering in the evaporator?
• What is the purpose of a back pressure regulator in an ammonia system?
• Under normal load conditions with an overfeed design, how much superheat is found at the outlet of an evaporator?
• Which component enhances the efficiency of the refrigeration cycle by removing heat?
• How do you convert 56°F to Celsius?
• What is the tax gas/flash gas effect in an ammonia refrigeration system with an evaporator at 10°F and a condenser at 85°F?
• What should an operator do if the compressor takes a slug of liquid ammonia and is hydraulically pounding?
• What is the fire diamond rating for pure Ammonia in terms of health?
• Where is the ideal location to manually purge noncondensibles from a refrigeration system?
• What conditions are associated with high head pressure in a refrigeration system?
• How does the compressor affect temperature control in the refrigeration system?
• Should you use liquid water on liquid Ammonia in atmospheric conditions?
• In addition to the four primary components of a refrigeration system, which two components are equally critical?
• What form of Ammonia is primarily considered hazardous when it comes into contact with the skin?
• What is the volume of a room that is 10 feet long, 14 feet wide, and 20 feet high?
• If a small percentage of ammonia enters the oil, what will likely happen when the pressure on the oil is lowered?
• If you see a green diamond with the number 1005 on a transportation vehicle, what substance is inside the tank?
• Is ammonia included on the EPA toxic chemical list?
• What is the immediately dangerous to life and health (IDLH) level for ammonia according to OSHA?
• If an ammonia receiver has a capacity of 1000 pounds at 90°F when completely filled, what is its mass capacity?
• What does specific heat (Cp) refer to?
• What role does the condenser serve in an industrial ammonia refrigeration system?
• Is cavitation beneficial for liquid pumps?
• What is the relationship between temperature and heat?
• In the hot gas defrost process, what type of gas is piped through the evaporator?
• What role does gravity play in the separation steps of an impingement style oil separator?
• What is a common issue if the head pressure is excessively high?
• What should never be done with a high-pressure cut-out switch?
• Approximately how many BTU's does it take to convert 1 pound of liquid water at 212° F to steam at 212°F?
• Which of the following is a type of condenser used in ammonia refrigeration?
• What ability should an operator have from outside the doors to the engine room?
• In a baffled shell and tube heat exchanger, what flows through the tubes?
• What effect does an increase of heat on the bulb of a TXV have on the valve?
• What does it mean when a refrigerant is superheated?
• In a shell and tube chiller, what fluid flows through the tubes in a flooded system?
• How many groups of halocarbons are there?
• How does the evaporator primarily operate within the refrigeration cycle?
• An Ammonia refrigerant line shows a vapor pressure of 11"Hg at -44° F and is at -20° F. What is the condition of the refrigerant?
• In a refrigeration system, what happens to the compression ratio when suction pressure is dropped?
• Approximately how many BTU's does it take to convert 1 pound of saturated liquid ammonia to 1 pound of saturated gas?
• Is a 1/2% concentration of Ammonia considered a deadly concentration?
• Are oil and liquid ammonia considered to be miscible?
• What is one benefit of using a water/glycol mixture in oil pulling for compressors?
• Can ammonia vapor clouds be knocked down at atmospheric conditions using water?
• A reciprocating compressor typically requires a minimal oil pressure difference of how much above suction pressure?
• Why might oil accumulate at the lowest point of an evaporator in an ammonia system?