NYC RMO

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NYC RMO EXAM, CHAPTER 16 (Refrigeration Code) questions with verified answers
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16.01.) With reference to specific minimum requirements for refrigerant pipe and tubing, one of the following is most nearly correct? Ans-Standard I.P.S. copper, brass pipe and tubing shall not be less than 80% copper (ask professor) 16.02.) How many stop valves are required by code in a system using 60 lbs. of "group one" refrigerant, and having two compressors and two receivers? Ans-Four (ask professor) 16.03.) Which of the following ASHRAE "designation and safety classification...
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NYC RMO EXAM, CHAPTER 19 (Capacity Control) questions with verified answers
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19.01.) For a given application, a particular compressor is found to have a volumetric efficiency of 72%, when operating at its design speed of 300 rpm. If the speed is increase to 500 rpm it is most likely that the volumetric efficiency will? Ans-Decrease 19.02.) From the following, compute the rpm of a single acting compressor. If it has a stroke of 8" and the piston speed (velocity) is 360' feet per minute? Ans-270 19.03.) Calculate the compressor displacement of a (2) cylinder, 6x6 c...
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NYC RMO EXAM, CHAPTER 26 (Troubleshooting) questions with verified answers
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26.01.) While conducting a tour of the refrigeration plant, an operator notices a significant increase in the amount of superheat in a particular reciprocating system. Which of the following would be a possible cause for this condition? Ans-Location of the thermal bulb 26.02.) In a high side float refrigeration system, what does frost on the suction line indicate? Ans-There is an excess of refrigerant in the system
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NYC RMO EXAM, CHAPTER 17 (Cryogenics) questions with verified answers
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17.01.) If a compression refrigeration system is operating at the standard ton conditions of 86 degrees F on the high side and an evaporator temperature of 5 degrees F. These temperatures corresponding to suction pressure of 34.27 psia, and a head pressure of 169.2 psia. Based on these values, what will the compression ratio be? Ans-4.94 17.02.) Which set of operating conditions would require the use of a booster compressor? Ans-15 psig/ 280 psig
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NYC RMO EXAM, CHAPTER 23 (Electricity Fundamentals) questions with verified answers
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23.01.) A motor is operating from a 120 volt power source; it is drawing 30 amps and has a resistance of 4 ohms. How many kilowatts it is consuming at full load? Ans-3.6 23.02.) For a single test device to qualify as a multi-meter, which of the following electrical units must be measured? Ans-Voltage, amperage, resistance 23.03.) Which of the following best describes the power source used by a two horsepower induction motor? Ans-Three phase power source
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NYC RMO EXAM, CHAPTER 18 (Engine Indicators) questions with verified answers
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18.01.) When attempting to read the high pressure gauge on an operating ammonia compressor, it is noted that the pointer "hunts" (has a wide and relatively slow back and forth movement). This would most likely indicate that the compressor? Ans-Valve action is sluggish 18.02.) Of the following statements, which one is correct regarding an engine indicator diagram? Ans-An abnormal diagram indicates a mechanical problem with the compressor
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NYC RMO EXAM, CHAPTER 11 (Centrifugal Water Pumps) questions with verified answers
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11.01.) An operator is running two centrifugal water pumps in parallel; one of the pumps is operating at its maximum flow rate. If the operator throttles back on the discharge valve of the second pump, which of the following will take place? Ans-A reduction in both the water flow and pressure 11.02.) Which of the following valves should not be used to regulate flow? Ans-Gate 11.03.) Which of the following will not cause a pump to cavitate? Ans-Air entering through the pump seals
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NYC RMO EXAM, CHAPTER 21 (Absorption Systems) questions with verified answers
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21.01.) The term "anhydrous" is used to indicate that a refrigerant? Ans-Has no water in it 21.02.) Which of the following are considered auxiliary components in an absorption system? Ans-Analyzer, rectifier, receiver, heat exchanger 21.03.) What kind of piping would you not choose for ammonia or an aqua-ammonia solution? Ans-Galvanized steel
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NYC RMO EXAM, CHAPTER 20 (Controls) questions with verified answers
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20.01.) Which of the following voltages is often used in control systems? Ans-24 v 20.02.) Solenoid valves are actuated by which of the following power sources? Ans-Electromagnetic 20.03.) In the "pump-down control system" the thermostat should be wired in series with which device? Ans-Solenoid valve
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