FDNY Respiratory Medical Officer (RMO) Practice Exam

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• What could cause high condenser pressure in a system with clean condenser tubes?
• What is the most important reason to sub-cool refrigerant in the condenser?
• What is the role of a throttle valve in a steam turbine system?
• Which factor contributes to high efficiency in refrigeration systems?
• What is usually the first indication of a problem when water treatment of the condenser water is not maintained?
• What is the first step to start a centrifugal chiller?
• What color must cross connections and standpipe risers be painted?
• As an engineer, what action should you avoid when the discharge pressure of your condenser water pumps is significantly lower than normal?
• What is a potential consequence of an improperly set thermal expansion valve?
• When does the exchange of BTUs become greatest in a cooling system?
• Where must the Material Safety Data Sheet (MSDS) be located?
• What is the approximate volume, in cubic inches, of a reciprocating compressor cylinder with a 10-inch bore and a 14-inch stroke?
• The vibration of a steam turbine approaching critical speed indicates what kind of risk?
• What likely causes oil foaming in the crankcase of an R-22 single acting compressor system?
• What is the correct method for calibrating a thermometer?
• If a restriction develops in the refrigerant flow to a jet ejector in an oil-raising system, what may occur?
• What is the ratio of suction pressure to discharge pressure in a centrifugal compressor operating at 3 psig and 10 psi respectively?
• When faced with a refrigerant line that has collapsed at a bend, what practice is best to prevent this?
• Under what conditions is it permissible to chain an exit door?
• A standpipe certificate should be available for which parties?
• The elimination of corrosion in a cooling medium system can be achieved by using:
• If a reciprocating compressor has a suction pressure of 65 psig and a discharge pressure of 120 psig, what is the compression ratio?
• A low viscosity number for lubrication oil indicates what about its flow characteristics?
• At a dry bulb temperature of 75 degrees and a wet bulb temperature of 73 degrees, what is the likely relative humidity?
• What method can help avoid problems with water and moisture in a refrigerant system?
• What characteristic of the indirect refrigerant system contributes to its leak prevention?
• What is a potential risk of operating a compressor with low oil levels?
• What material is commonly used for modern compressor shaft seals?
• When installing copper tubing refrigerant lines that require bends, what tool should be used to avoid collapsing the tubing?
• What is the role of oil in a refrigeration machine?
• What is the result of using an oversized compressor in a refrigeration system?
• Which component is essential for maintaining the proper operation of a refrigeration system's pressure?
• Centrifugal chillers are best characterized by which of the following features?
• If a motor winding is touching the inside of the motor housing, what could be a potential consequence?
• During a routine check, what is the most likely cause of a frosted suction line and compressor?
• What happens when there is a restriction in the refrigerant liquid line of a water chiller equipped with a reciprocating compressor?
• Which component is crucial for ensuring efficient refrigerant expansion in a refrigeration system?
• What is one common indication of a refrigerant leak in a refrigeration system?
• Where is the muffler typically located in a refrigeration system?
• Where can one find information about the physical and chemical properties of hazardous materials?
• Which of the following is considered an essential maintenance item for chillers?
• An advantage of using glycol instead of salt brine as an intermediate cooling medium is:
• How is the electrical power used to operate a solenoid valve measured?
• Which ASHRAE refrigerant classification is FDNY most concerned with?
• What is the main reason for using ribbed metal piping for electrical wires connected to the refrigeration system?
• How is the water level controlled in the surface condenser hot well of a steam turbine?
• Which ASHRAE refrigerant safety classification is considered the most flammable?
• The oil pressure gauge reading in relation to the suction pressure of a compressor should be closer to:
• When charging refrigerant on the low side of a reciprocating machine, what is the correct position of the manifold gauge?
• A FDNY permit is required for which of the following activities?
• Which component is typically not required to be serviced annually?
• Electrical current is commonly measured in what unit?
• What is the most likely cause of cavitation in a chilled water pump?
• Which feature is most important for a fire alarm system to function properly?
• How does the presence of moisture affect the performance of a steam turbine?
• In an indirect refrigeration system, which of the following is NOT used as a cooling medium for building spaces?
• What is typically responsible for regulating refrigerant flow in cooling systems?
• What is the most crucial requirement for an effective evaporator?
• What occurs when a steam turbine reaches critical speed?
• Which statement accurately characterizes a centrifugal refrigerant machine?
• What term describes the ratio of actual water vapor pressure to the saturated pressure at a given temperature?
• What is the effect of not maintaining sufficient refrigerant levels in a system?
• What is a possible consequence of failing to maintain water treatment in a refrigerant system?
• When is a centrifugal water pump considered fully primed?
• What does a wiring diagram typically depict?
• What does the packing gland of a centrifugal pump indicate when it has a drip?
• At what pressure is a relief valve expected to start functioning?
• The primary use of a jet ejector in a refrigeration system is to:
• An automatic expansion valve primarily maintains which of the following?
• What is the most likely cause of a starved evaporator?
• What does a Thermal Expansion Valve (TEV) maintain constant?
• What could be the cause of a knocking sound in a reciprocating compressor if worn parts are ruled out?
• Why is a refrigerant gauge referred to as a compound gauge?
• A refrigerant leak in the evaporator shell of a system using R123 will likely result in what condition?
• Where should the bulb of the thermal expansion valve be attached during inspection?
• What is a superheated vapor?
• What aspect of turbine performance is most directly affected by fluctuations in speed?
• After verifying the electrical circuit to the refrigeration compressor, what is the next component that should be checked if the compressor does not turn on?
• What is the responsibility of a B29 CoF Holder?
• What is the purpose of steam ejectors on the surface condenser of a system with a turbine?
• Emergency power testing must be conducted how frequently?
• What is the volume of a box that measures 12 inches on each side?
• What indicates the need to check the condenser water pump in a refrigeration system?
• What must a refrigeration system remove to convert water at 32°F to ice at the same temperature?
• What is the primary method of achieving capacity control in a centrifugal compressor?
• What is a common cause of increased high side pressure in a refrigeration system?
• What effect does a leak in the evaporator shell of a chill water system using R134a have?
• What happens to moisture levels in the air when its temperature drops?
• Which components are typically involved in a refrigerant pump system?
• What instrument should an engineer use to check for shorts in the motor windings?
• In a refrigeration system, what effect does increased condenser pressure have?
• What maintenance strategy can prevent a steam turbine from reaching critical speed?
• A chilled water system with an air-cooled condensing unit on a roof during cold weather has what type of protection?
• What does short cycling in a centrifugal compressor using a low side float valve typically indicate?
• What is a critical parameter for assessing cooling tower performance?
• Who is permitted to leave the building refrigeration system when it is in operation?
• Regardless of the ASHRAE refrigerant classification in use, what should the engineer be aware of in the event of a refrigerant escape?
• How long typically does it take for a steam turbine to warm up?
• Why are copper and aluminum commonly used for condenser tubes in refrigeration systems?
• Which refrigerant state is typically present after passing through a metering device?
• How many gallons of water can be expected from draining a 75-foot long pipe with a diameter of 12 inches?
• In cooling systems, what is the primary purpose of refrigerant flow regulation?
• Monitoring which parameter is essential for preventing turbine failure?
• What classification do electric devices used for built-in defrosting of refrigeration machines fall under?
• After recovering liquid refrigerant from a centrifugal chiller, what is the next step?
• If a temperature chart indicates a Celsius temperature of 4 degrees, what is the equivalent in Fahrenheit?
• Which factor can be adjusted to improve the cooling efficiency of a condenser?
• How long should a fire watch be maintained if a standpipe system is out of service for two days?
• What happens when a thermal bulb's insulation fails in the refrigeration cycle?
• What should the flash point of compressor lubricating oil be in relation to the compression temperature?
• When entering Phase 11 fireman's service, who has control of the elevator?
• Which of the following components is essential in maintaining the operational stability of a steam turbine?
• Which component's malfunction could lead to compressor overheating?
• Which of the following compressors is classified as not being a positive displacement type?
• The phenomenon of violent vibration in a steam turbine at critical speed can lead to what problem?
• Which component is not used to vary the flow of refrigerant in a refrigeration system?
• According to fire safety regulations, what must be ensured when storing refrigerant in containers?
• What is the primary function of the turbine auxiliary oil pump?
• What is the most widely used regulation book among operating engineers?
• In a multi-stage centrifugal compressor, each stage is:
• What type of refrigerant is found inside the machine's gauges?
• What do approved refrigerant containers ensure during storage?
• If a condenser pump is not running and the pressure gauge shows 55 psi, what is the approximate floor level of the cooling tower?
• What is the primary function of a safety head on a compressor?
• A faulty compressor valve can lead to which of the following issues?
• What component helps to join different sections of piping in refrigeration systems?
• How is the viscosity of lubrication oil described?
• What is the ASHRAE classification for ammonia as a refrigerant?
• When is a chemical fire extinguisher system needed?
• What is the typical feature of liquid level gauge glasses?
• When would the most damage occur to a centrifugal pump with a leaking check valve?
• What type of vapor does a compressor primarily discharge?
• What is the function of the equipment that removes non-condensables from the condenser?
• What should be done first when starting up a centrifugal chiller's system?
• What is an essential feature of condensers in a refrigeration system?
• What type of valve should be installed to isolate a dual pressure relief valve while keeping the system in service?
• The vessel generally used in connection with refrigerant recovery is:
• What is the correct procedure to put an additional pump online in a refrigeration system?
• In a 2000 ton centrifugal refrigeration system, what is the first step if the panel indicates a water flow issue?
• If a refrigerant chart indicates a temperature of 5 degrees Celsius, what is the equivalent temperature in Fahrenheit?
• What type of valve is used to manage high-pressure situations in HVAC systems?
• Why is a pressure relief valve preferred over a fusible plug in refrigeration systems?
• Which property is considered desirable in a refrigerant?
• What is a key advantage of forced draft cooling towers over natural draft cooling towers?
• In refrigeration systems, what is primarily stored in the compressor?
• In a semi-hermetic compressor, what is the primary function of the suction vapor?
• What is the primary purpose of using a low side float valve in a refrigeration system?
• Which safety measure is crucial when a turbine approaches critical speed?
• In a cold front scenario with a sudden temperature drop, how would the thermostat respond regarding the solenoid valve?
• What is the function of capacitors on refrigeration motors?
• What two characteristics is the ASHRAE refrigerant safety group classification system based upon?
• What is the primary role of the Kingsbury thrust bearing in a steam turbine?
• When is a centrifugal water pump classified as a lift pump?
• What is one possible consequence of running a refrigeration unit with low refrigerant levels?
• After leak testing with R22 and nitrogen, what should be the next step?
• What is the benefit of using fireproof decorations in buildings?
• For which reason might impurities be removed from a refrigerant system?
• What is the purpose of a low side float valve in a refrigeration system?
• Which of the following is a method used to ensure proper refrigerant flow in a cooling system?
• If 29.92" HG equals 14.7 Psia, what is the conversion of 26" HG to Psia?
• What will occur in the evaporator if the external equalizer line is disconnected?
• What is the consequence of insulation breakdown on a thermal bulb attached to a suction pipe?
• What does a high reading on a condenser pressure gauge typically indicate?
• What type of vapor is present at the end of a properly operating evaporator with an expansion valve?
• If the suction pressure of a reciprocating compressor rises rapidly after stopping, what is the most probable cause?
• Which of the following is NOT a feature of the governor valve?
• Why does the removal rate of refrigerant slow down when using a portable compressor recovery unit?
• What is the equivalent energy consumption for a 5 horsepower motor operating for 9 hours in kilowatt-hours?
• What is the maximum amount of extra refrigerant that can be stored in a machine room?
• What is the primary requirement for fire alarm books?
• Which of the following best describes the function of a check valve in a pump system?
• What is a common indication of refrigerant contamination in a compressor?
• Centrifugal pressure in a system is primarily determined by what factor?
• What should be the minimum pressure graduation rate for a gauge on the high side of a system?
• What is a key advantage of a shell and tube condenser over a shell and coil condenser?
• What is often used as the initial troubleshooting step in refrigeration systems?
• What is the primary goal of maintaining proper condenser water treatment?
• How often should a sprinkler system that is offline be inspected until it is restored to service?
• What is the most likely cause of high discharge pressure and high normal subcooling in a refrigeration system controlled by a TEV?
• What is the nature of R134 refrigerant as described by the Material Safety Data Sheet (MSDS)?
• Why is the selection of the right refrigerant critical in HVAC systems?
• What is the most likely cause of cavitation in a condenser water pump?
• What happens to the efficiency of a centrifugal compressor when the condensing pressure is lowered?
• In the absence of chemical treatment, how often should a cooling tower be drained and replaced with fresh water?
• What is a common fault that might cause a motor to trip on overload?
• What is the purpose of the oil charging port on a compressor?
• According to code, where is emergency power not typically required?
• What purpose does an equalizer line serve on a thermal expansion valve (TEV)?
• How many BTUs are removed in a 30 ton cooling system per hour?
• What equipment should manifold hoses be equipped with?
• What is a common reason for reduced effectiveness in a sprinkler system?
• The rupture disc for a low-pressure centrifugal refrigeration machine is typically located on which component?
• What mechanism primarily removes heat in a cooling system?
• Which ASHRAE refrigerant safety classification indicates no flammability and lower toxicity?
• Why is it important to control the speed of a steam turbine during operation?
• What is a potential consequence of refrigerant leaking from an evaporator?
• What is the cooling medium for a cooling tower?
• To superheat a refrigerant, it must be heated in which section of the refrigerant line?
• Which type of pump is typically shown in an insulated configuration in a refrigeration system?
• In a steam turbine system, maintaining proper speed is crucial for what reason?
• If the chilled water supply to a building is 55F, what should be your concern if it’s used for human comfort?
• What is the primary function of the equipment that detects refrigerant leaks?
• What effect does lowering the condensing pressure have in a refrigerant cycle?
• Which type of refrigerant system is least prone to leaking refrigerant?
• What is the cooling medium for an evaporative condenser?
• For how long must a fire alarm log book be maintained?
• Which of the following can lead to system inefficiency in refrigeration systems?
• How much does 2.5 gallons of water weigh?
• If you notice unusual noise and hot operation of condenser pump #1, what should you do?
• What type of heat is removed from the refrigerant in a condenser?
• What is an appropriate action when a refrigerant leak is suspected in a system?
• Which condition would likely indicate a need for superheating in a refrigeration system?
• What is the consequence of an improperly calibrated pressure gauge?
• What is the primary use of a psychrometer by refrigeration engineers?
• What is the primary purpose of using a filter dryer in a refrigeration system?
• What performance aspect distinguishes shell and tube condensers from shell and coil condensers?
• An engineer observes a gauge that reads saturation pressure of a refrigerant. If chilled water is circulated as the cooling medium, what can this reading best estimate?
• Which information is typically absent from a Material Safety Data Sheet (MSDS)?
• What is the purpose of wear rings in a centrifugal pump?
• In the context of a centrifugal refrigeration system, what would you check if the system is not operating correctly?
• Which of the following represents a reason to troubleshoot a cooling system?
• Which refrigerant is known for having the highest latent heat and refrigerant effect in commercial and industrial applications?
• For which type of refrigerant is FDNY approval required?
• What is the lowest temperature that a cooling tower can reach?
• Which characteristic accurately describes a hermetic compressor?
• What issue can arise if the water supply to a pump's suction inlet is below its level?
• In a refrigerant system, what does a rising suction gauge reading indicate?
• If a valve handle is at a 45-degree angle, in what position is the valve?
• What will happen if some unloaders in a multi-cylinder reciprocating compressor fail to operate when needed?
• What is the typical role of latent heat in a condenser?
• Which feature of fusible plugs is critical to their operation in a condenser system?
• What is the purpose of a water regulating valve in a condenser system?
• Why should moisture in the inlet of a steam turbine be kept as low as possible?
• A water pump is discharging against a head of 92 feet of water. What is the approximate pressure in psi?
• When refrigerant, water, and oil are observed together, in what order do they settle in a container?
• Which of the following best describes a standpipe hose outlet?
• What is the primary function of gland steam in a steam turbine?
• What determines the amount of refrigerant that flows through the orifices of an economizer?
• What is a compressor safety head?
• What causes the opening of the solenoid valve in a refrigeration system?
• What are pre hot work procedures performed prior to hot works?
• In a refrigeration system, what might cause a significant drop in compressor discharge temperature alongside high suction line pressure?
• Which equipment connects to the middle port on a gauge manifold?
• What is the process of extracting and cleaning refrigerant for reuse without requirements called?
• How many gallons of water are in a pipe that is 8 feet in diameter and 10 feet long?
• Refrigeration systems that require FDNY approval typically handle which refrigerant?
• What is essential to monitor in a centrifugal pump to ensure proper operation?
• In a multizone standpipe system, how is water supplied to each zone?
• What can cause a decrease in removal rates when recovering vapor refrigerant?
• A refrigeration engineer notices excessive cycling of the temperature control for a reciprocating compressor. What might be causing this condition?
• What immediate action is recommended when the condenser water temperature is higher than desired?
• What is the minimum frequency for logging readings by an engineer?
• What is the purpose of adding chemical additives to cooling tower water?
• What type of emergency response plan is vital for buildings with automatic sprinkler systems?
• What kind of design does a centrifugal pump typically utilize?
• What causes the atmospheric valve to open on a steam turbine?
• What is a major advantage of a shell and coil condenser?
• Which device is responsible for protecting the steam turbine from excessive speed?
• In a single-phase 208 VAC circuit, how many hot wires are typically present?
• What is the benefit of installing an inline refrigerant cleaning system?
• While performing hot works near a sprinkler head, what can be done to prevent the fire alarm from activating?
• Where do non-condensable gases, like air or nitrogen, typically accumulate in a refrigerant system?
• If you are running a 2000-ton steam-driven turbine centrifugal refrigeration system and the panel indicates a water flow issue, what is the appropriate action to take?
• Where are the suction and discharge valves mounted on a reciprocating compressor?
• Which of the following would be a sign of a malfunction in a refrigeration system?
• How does a cylinder unloader function in a refrigerant system?
• What could be a consequence of a steam turbine operating at critical speed without regulation?
• Under normal conditions, how does refrigerant enter and leave the compressor?
• What device is responsible for automatically controlling the speed of a steam turbine?
• Which of the following does not require flame resistant treatment?
• What method is used on an outside pipe to prevent it from freezing?
• Which example represents an in-line refrigerant cleaning system for use with a centrifugal compressor containing R123 refrigerant?
• When one centrifugal pump in parallel is throttled back, what is the result?
• What is the state of refrigerant as it enters the compressor in a reciprocating machine?
• What can be found marked on fusible plugs located on a condenser?
• What action should an engineer take if most buildings are satisfied with chill water, except one?
• What happens if the air louvers in an induced draft cooling tower become clogged?
• A circuit breaker serves a function similar to which of the following?
• What is the primary purpose of installing a muffler in a reciprocating refrigerant machine?
• If 10 BTUs are transferred to 10 pounds of water, what will be the closest increase in water temperature?
• How is capacity control of a reciprocating hermetic compressor typically achieved?
• What might cause high suction superheat in a refrigeration system?
• What is typically the first step after recovering all liquid refrigerant from a system intended for overhaul?
• What could lead to a decrease in the efficiency of a reciprocating compressor?
• Which type of valve is most effective for controlling pressure in a refrigeration system?
• In a condenser, the heat to be removed from the refrigerant is equal to the heat gained in which component?
• What is the primary function of a governor valve in a steam turbine system?
• What is one of the major benefits of properly functioning lubrication in equipment?
• If R134 accidentally touches a refrigeration engineer's skin, what first aid should be applied?
• If you are the only engineer on duty and a vice president asks you to shovel snow, what should you do?
• What is the height of the water column in feet when the pressure gauge at the pump's inlet shows 140 PSIG?
• What happens to the oil collected in an oil separator?
• What device is used to convert 110 volts to 24 volts in an electrically operated control system?
• What is the most common metering device in reciprocating commercial refrigeration systems with a capacity of under three tons?
• Why is it important to check oil levels in a centrifugal chiller?
• What is the function of the vacuum breaker in a steam turbine?
• Why is it important to use at least two compressors in a cascade system?
• What is the correct order of components on the liquid line of a reciprocating system from the condenser to the TEV?
• What type of liquid refrigerant has passed through a metering device?
• What action should be taken if the condenser water pump fails during operation?
• What is the charge of a TEV sensing bulb similar to?
• If resistance is cut in half, what happens to the power factor?
• Which device is used to measure the speed of a turbine?
• What is usually the third wire in a single-phase 208 VAC circuit?
• Which type of sprinkler system requires regular inspection?
• What is the primary function of a high-side float valve in a refrigeration system?
• Where is the charging valve typically located on a refrigeration system?
• In a refrigeration cycle, where is heat absorbed from the environment?
• What should be done when all liquid has been recovered from a refrigeration system prior to an overhaul?
• What is the primary purpose of using a digital thermometer in a refrigeration system?