FDNY CoF – Supervision of Fire Alarm Systems (Q-01) Practice Test

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• What is a common consequence of moisture in a refrigeration system?
• What action is NOT recommended during an ammonia system accident?
• In an NH3 dry expansion evaporator with TXV properly installed, what is the acceptable range for superheat?
• What is the optimal condition of oil in a refrigerant system?
• Rupture members, when used in parallel with a relief valve, are not to exceed what percentage above designed working pressure?
• What does the term solubility refer to in relation to refrigerants?
• What happens to AC amperage as DC amperage rises on a synchronous motor?
• What would likely happen if a reciprocating refrigeration compressor thermostat has a narrow differential?
• What is the primary function of an electric float switch in a flooded shell-and-tube cooler?
• What is the purpose of a pressure-limiting device in a refrigeration system?
• If the sight glass is blue/green, what condition does the refrigerant indicate?
• What must be installed if any piece of equipment can be isolated as a separate unit?
• What is a common indicator of inadequate ventilation in a fire alarm system?
• What is the primary function of a manometer in refrigeration systems?
• Under a heavy load, what will happen to a constant-pressure expansion valve?
• What additional mask is required when the refrigerant level exceeds 2,000 lbs.?
• In which refrigerant is the solubility of oil lowest?
• What effect does the presence of water have in the refrigerant side of a Freon system?
• In an automatically operated, flooded shell-and-tube cooler, what is the primary function of an electric float switch?
• What is the recommended mechanical air discharge for a system with 2,000 pounds of refrigerant?
• The strength of strong liquor in an absorption system decreases as what happens?
• Which valve should be closed first during the shut-down procedure of a centrifugal feed water pump?
• In a refrigeration system, what is the purpose of a TXV sensor bulb?
• What is typically used to measure the pressure reference in a refrigerant system?
• What does refrigerant recovery entail?
• Where is a dryer typically installed in a commercial Freon compressor system?
• What is a common indicator of a system in need of servicing?
• When does the temperature on a wet-bulb thermometer equal the dry-bulb temperature?
• To vary the capacity of an absorption plant, what should be regulated?
• Which situation would cause the strong liquor in the absorber to decrease?
• How many pounds of refrigerant can be stored in a machine room if the machine has 1,000 lbs. in it?
• At what pressure does the relief valve blow on a high-pressure machine?
• What does R-12 convert to when heated?
• If the pressure drop in an evaporator is less than 2.5 lbs., what would the system indicate?
• What does a manometer measure?
• Freon-12 has similar high and low pressures to which other refrigerant?
• Which characteristic is true about chilled water pump lines?
• What effect does high moisture content have on a refrigeration system?
• Which statement regarding oil and ammonia is true?
• What method controls carbonate deposits from brine on ice cans effectively?
• Which of the following is a key indicator of a malfunctioning compressor?
• What is the capacity of a 10-ton refrigeration unit when expressed in BTUs?
• When should the compressor turn on according to the low pressure control?
• What is the latent heat of vaporization for water at 212°F?
• Purging a double-pipe condenser should be done from which location?
• How is pressure relief typically achieved in refrigeration systems?
• How many kilowatt hours are equivalent to 746 watts?
• What does the term 'capacity' refer to in the context of refrigeration systems?
• What could be a consequence of too much refrigerant in a system?
• What is the first step in the start-up procedure for a centrifugal feed water pump?
• Which process can help manage ammonia and oil interactions in a refrigeration system?
• One vertical foot in a riser equals how many psi?
• Who is responsible in a plant to assure refrigerant cylinders are within the hydrostatic test dates?
• What would frost immediately after a restriction in the liquid line indicate?
• How stable are chlorine-based refrigerants without hydrogen in the lower atmosphere?
• What happens to the performance of a refrigeration unit with increased temperature?
• What is the typical time delay for an oil safety switch?
• On a common three-phase, four-wire service, what should the voltage be between any phase and neutral?
• To vary the specific capacity of an absorption refrigerating plant, which regulation should an operating engineer make?
• The main reason for purging a Freon centrifugal refrigerating system is to remove what?
• The purpose of the throttling device in a refrigeration system is to:
• In an absorption system, where does the refrigerant boil?
• In a flooded evaporator with an accumulator and float valve, where does flash gas pass?
• What does the purge system do in a refrigeration system?
• What issue may arise from using Ternary Blends?
• At what operating pressure should the oil safety switch activate?
• When removing the refrigerant, what is the goal of refrigerant recovery?
• On what pressure does the relief valve typically blow on a high-pressure machine?
• True or False: R-22 can be easily poured from a bucket under normal room conditions.
• Which of the following is NOT a design factor affecting compressor capacity?
• What is a consequence of failing to purge a refrigerating system?
• What is the term for the combination of run and start capacitor values in parallel?
• What is the main cooling medium for the motor in a semi-hermetic reciprocating compressor?
• Which refrigerant is known for having a high miscibility with oil?
• What refrigerant is usually excluded from typical refrigerant recovery procedures?
• If an evaporator has a pressure drop of 5 lbs. or more, what might that indicate?
• Which of the following statements is incorrect about rupture members?
• What is an open compressor characterized by?
• The subcooling effect of refrigerant just before the expansion valve primarily increases what?
• Which component would typically be found in a closed-loop cooling system?
• At a suction temperature of 50° F, what is the corresponding pressure in psi for an ammonia system?
• Cylinders and tanks must be hydrostatically retested according to regulations at what minimum interval?
• What is the main concern when a compressor runs for a long cycle due to low thermostat differential?
• Are the lines of a chilled water pump typically insulated or uninsulated?
• What is the function of the electronic capacity control module?
• What is the maximum recommended pH level for reducing carbonate deposits effectively?
• In which part of the refrigeration cycle does heat absorption occur?
• What is a desirable property of ammonia refrigerant oil?
• In a lithium bromide absorption system, what is the lowest possible temperature that can leave the evaporator?
• Which statement is true concerning Ternary Blends?
• Which of the following would not help determine compressor displacement?
• In capacitor-start, capacitor-run motors, what is the function of the start capacitor?
• What is the first sign that the drum of ammonia refrigerant is nearly empty?
• How is an evaporator typically defrosted?
• How many watts are equal to one horsepower?
• In an efficiently operating induced draft cooling tower, the leaving water temperature is typically between which two temperatures?
• In a compression system, where is vapor charged?
• What kind of pressure can indicate issues with noncondensable gas in refrigerant systems?
• Where do you charge vapor in a compression system?
• Which of the following processes is part of heat transfer?
• What is the purpose of an atmospheric line on an indicator card from a double-acting ammonia compressor?
• What does the term 'anhydrous ammonia' refer to?
• What is the importance of keeping refrigerant levels appropriate in a system?
• What is the typical range for leaving water in an efficiently operating induced draft cooling tower?
• How is relative humidity defined?
• Sodium chloride is not used effectively when the temperature is below what?
• In relation to pressure relief devices, what does "C" equal in the formula C=Fd1?
• Which statement about the compression ratio of a reciprocating compressor is true?
• When analyzing CO2, water, and oil in terms of density, which material is on the top in a recovery cylinder?
• Which system feature helps improve operational efficiency by managing the load on a compressor?
• In an evaporator that chills brine, what process provides the greatest cooling effect?
• One characteristic of a synchronous motor is that it operates at what type of speed?
• What happens when the expansion valve is opened in an absorption system?
• If purging fails in a refrigerating system, what is likely to occur?
• What is typically found in a refrigeration system to prevent backflow?
• An efficient oiling system for a large centrifugal system must include which of the following components?
• What is the second step in the shut-down procedure for a centrifugal feed water pump?
• What is the result of dirt obstructing the solenoid valve in a refrigeration system?
• What is the best method for determining the quantity of refrigerant while charging a system?
• On a 220 volt, three phase, 4-wire electric service, what will any line read?
• Which gas is often reclaimed in an automatic purger?
• In refrigeration, what component is responsible for changing the refrigerant from a liquid state to a vapor?
• What is the normal position of the liquid-line service valve?
• In a flooded evaporator with an accumulator and float valve, what happens to the flash gas?
• What controls the water regulating valve on the condenser water outlet?
• Which type of fittings are typically used for joints in a refrigeration system with Freon?
• The ideal condition for an accumulator is:
• What effect does high pressure drop in the evaporator have on a refrigeration system?
• In a Freon refrigerating system, how should the joints made of hard copper fittings be completed?
• In an operating evaporator, oil stays on the top of which refrigerant?
• In an operating evaporator, oil will typically stay on top of which refrigerant?
• What is one of the first steps to take when diagnosing a refrigerant leak?
• In an absorption system, where does refrigerant boil?
• What component is found in a purger?
• What type of failure will fuses and circuit breakers not protect electric motors against?
• Discharged SO2 may be put in a tank of __________ and not be used for any other purpose?
• What is a desirable characteristic of a refrigerant regarding its thermal properties?
• What is the primary function of the king valve?
• A wound-rotor induction motor with external resistance typically functions as what type of motor?
• What does it indicate if the last coil of a direct expansion coil evaporator has no frost?
• Where is the scale trap located in a refrigerating system?
• What pressure triggers the low pressure control to turn the compressor off?
• What is the main purpose of a purger in an NH3 system?
• What is the setting temperature of a fusible plug?
• Which characteristic is NOT usually desired in refrigerants?
• What is the conversion of one ton of refrigeration in BTUs per minute?
• How many cubic inches are equivalent to one cubit foot?
• What should be turned off in case of an accident with an ammonia absorption system?
• In terms of water volume, what does the formula reflect when applied to pipes?
• How much ice does a machine rated at 10 tons produce in 24 hours?
• For maintaining optimal compressor function, why is oil circulation important?
• 746 watts is equivalent to how many kilowatt hours?
• Which refrigerant is known for the lowest solubility of oil?
• How many BTUs does one ton of refrigeration convert to per second?
• What is the significance of the diameter of the piston in determining the compressor's capacity?
• What is one effect of high humidity on fire alarm system components?
• What indicates that the huddling chamber design is effective?
• What effect does a decrease in evaporator load have on the strong liquor in the absorber?
• Where is the accumulator typically located in a refrigeration system?
• What is the primary purpose of the pressurized glass tank of oil on top of the booster compressor?
• Where can a butterfly valve be used?
• What effect does increasing load have on a constant-pressure expansion valve?
• Rupture members, when used in parallel with a relief valve, are not to exceed what percentage above the designed working pressure?
• What effect does a refrigerant overcharge have on head pressure?
• What should be monitored to prevent compressor overheating?
• How many pounds are in one gallon of water?
• What happens to the efficiency of the evaporator if the load increases?
• Which reagent is most effective for detecting ammonia brine?
• How many tons per head does an acme machine have?
• When is the best time to purge an ammonia plant with 250 lbs. of ammonia?
• What indicates a low solubility of refrigerant oil?
• What is the normal position of the liquid line service valve?
• What is the correct method to reverse the rotation of a three-phase, 60-cycle induction motor?
• What is the formula for calculating gallons of water in a pipe?
• Which step is NOT part of the start-up procedure for a centrifugal feed water pump?
• How does the strength of strong liquor in an absorption system change as the condenser pressure decreases?
• Which property is desirable for ammonia refrigerant oil?
• Where can a butterfly valve be used?
• What is the effect of increasing the pH of brine to 8?
• What is the formula for calculating volume?
• What is the velocity of air in an air duct if the flow rate is 340 cfm and the duct area is 4.5 square feet?
• What is the necessary adjustment to reduce the pressure in an absorption refrigerating plant?
• What does the term solubility refer to in relation to refrigerants?
• What is the purpose of a run capacitor in capacitor-start, capacitor-run motors?
• Relative humidity refers to which of the following?
• Which refrigerant operates at a head pressure of 50 psig?
• Which statement is true regarding the behavior of ammonia and oil?
• If a refrigerating system does not undergo proper operation, what consequence may occur?
• If the specific heat of glass is .196, how many BTUs are needed to raise the temperature of 10 pounds of glass from 50° F to 70° F?
• Which electrical motor protection device is known for its ability to automatically reset itself?
• What effect does noncondensable gas have in a refrigerating system?
• Is R-22 a miscible refrigerant?
• If a piece of equipment can be isolated, what must be installed as a safety measure?
• What is the primary reason for purging a Freon centrifugal refrigerating system?
• What is the formula for piston speed?
• The main effect of low pressure liquid boiling in an evaporator is to:
• When might a compressor lose oil?
• What does a compressor speed affect in a refrigeration system?
• What does a huddling chamber serve as in a safety valve system?
• In which refrigerant is the solubility of refrigerant oil lowest?
• What color does blue litmus paper turn when detecting ammonia?
• How many BTUs does one ton of refrigeration equal per hour?
• What does "C" equal in the formula C = Fd1 for a pressure-relief device?
• What pressure does the oil safety switch cut off?
• What does refrigerant recycling primarily entail?
• In a lithium bromide absorption system producing chilled water, what is the lowest possible temperature leaving the evaporator?
• What effect does improper TXV operation have on an evaporator?
• To achieve the desired evaporator temperature, the power input should be adjusted by manipulating:
• How much energy does one ton of refrigeration equal in BTUs per day?
• Which refrigerant is known to be least miscible in oil?
• In an absorption system, what medium is typically used to vaporize refrigerant?
• What is the speed of a six-pole, 50-cycle motor?
• How many tons of refrigeration is equivalent to 600,000 BTU per hour?
• What is one reason that can cause compressors to short cycle?
• How much greater is the alkalinity of a brine with a pH of 10 compared to one with a pH of 8?
• Which device is used to automatically control refrigerant levels in a system?
• What distinguishes the condenser water return line?
• In a reverse-cycle system, what component changes refrigerant flow from heating to cooling?
• Which factor affects the heat exchange efficiency in refrigeration systems?
• How does the phase angle between the run and start winding affect motor performance?
• In the context of a refrigerant-containing vessel, what does the formula C = Fd1 represent?
• What is the main purpose of the butterfly valve?
• What is one important reason for using both synchronous motors and induction motors in a refrigeration plant?
• During the re-expansion of the compressor cycle, which valve is closed?
• In a Freon refrigerating system with hard copper fittings, how should joints be secured?
• The accumulator's primary function is to:
• In an NH3 system, how is the condenser metal selected based on water type used?
• How can a technician determine the refrigerant type in air-conditioning equipment?
• Which of the following is an undesirable thermal property of a refrigerant?
• What device controls the flow of weak liquor to the absorber in a refrigeration system?
• What would you find in a machine room with refrigerant storage?
• A 10-ton refrigeration unit has which of the following capacities?
• What is the formula for calculating piston speed in a refrigeration system?
• What is the static setting of a TXV for superheat?
• What should be done if brine becomes saturated with ammonia in a small compression plant?
• What total force is exerted on a piston that has a diameter of 3" under a pressure of 100 psig?
• A wound-rotor induction motor with external resistance is classified as what type of motor?
• What is one primary function of a condenser in a refrigeration cycle?
• How can carbonate deposits from brine on ice cans be controlled effectively?
• How can refrigerant properties be classified?
• What is an indication of a compressor that is not properly functioning?
• What property of refrigerant flow does the four-way valve control in a heat pump system?
• What occurs when the relative humidity is 100%?
• Where can a butterfly valve be used effectively?
• If brine becomes saturated with ammonia in a small compression plant, what should you do?
• Which two methods are commonly used to cool hermetic compressors?
• Thermostatic expansion valves are rated in which of the following?
• How can you identify a condenser water line?
• Which type of tachometer utilizes reflecting tape to measure the rotation of an object?
• If all of the hydrogen atoms have been replaced in the base molecule by chlorine and fluorine, the refrigerant is said to be?
• From which part of a double-pipe condenser should purging be done?
• Which of the following is a desired characteristic of a chemical refrigerant?
• Which types of skin cancer are the most common non-malignant types caused by ozone depletion?
• What happens if the pressure drop across the evaporator is between 2.5 lbs. and 5 lbs.?
• How much water can an 8" diameter cylinder with a 10" stroke hold?
• Which characteristic defines a synchronous motor's operation?
• What can result from water present in the refrigeration side of a Freon refrigeration system?
• How is fire alarm system performance generally influenced by temperature fluctuations?
• What device automatically stops the operation of the pressure-imposing element when a certain pressure or temperature is reached?
• What is the characteristic smell of R-22 refrigerant?
• What would happen if the insulation was removed from the bulb of an expansion valve?
• According to ASHRAE Standard R15, what can an Oxygen Deprivation Sensor be used as?
• What aspect is critical in maintaining the performance of a refrigerant-containing vessel?
• What is the acceptable recovery method for refrigerant less than 200 lbs.?
• What does a pressure-relief valve primarily prevent?
• In a shell-and-tube condenser using NH3 and sea water, what metal is recommended for the condenser?
• Which property should refrigerant oil ideally have?
• How is ammonia typically detected in a system?
• What is the consequence of not following hydrostatic testing dates on refrigerant cylinders?
• Which chemical does not mix with oil and floats on top of it?
• When does the temperature on a wet-bulb thermometer equal the dry-bulb temperature?
• How many tons per piston does an acme machine typically have?
• Which of the following would indicate a restriction, such as dirt or scale, in the liquid line?
• When a moisture-saturated refrigerant is heated, what happens?
• What should be done in case of an accident with an ammonia absorption system?
• Heat transfer occurs through which combination of methods?
• Which property is critical for ammonia refrigerant oil?
• What would excessive moisture in a refrigerant system lead to?
• When comparing two brines, one with a pH of 8 and the other with a pH of 10, how much greater is the alkalinity of the brine with pH 10?
• During the operation of a capacitor-start motor, what happens when the start switch opens?
• At what temperatures is a soldered joint considered gas-tight?
• What does the floc point indicate in a refrigerant system?
• For identifying the refrigerant type in a system, what primary feature should be consulted first?
• Which electrical motor protection device automatically resets itself?
• How many breathing apparatus masks are needed for 1,001-2,000 lbs. of refrigerant?
• A soldered joint is defined as a gas-tight joint obtained by joining metallic mixtures that melt below what temperature?