Written Exam FDNY RMO Questions and Complete Solutions

1. The efficiency of the refrigerant cycle is affected by the operation of the condenser. of the following, a more efficient centrifugal compressor operation results from Answer: Lowering the condensing pressure 2. The heat removed from the refrigerant in a condenser is Answer: Sensible and Latent Heat 3. The refrigerant unit that you have been assigned to is being taken out of service for a major repair. You have been assigned to withdraw refrigerant for storage in suitable containers. According to the New York City fire code, You must ensure that the containers Answer: Are approved by the US Department of Transportation 4. Which of the following best describes how the cylinder unloader work?: - Keep in the suction Valve opened while the compressor is in the return stroke 5. In most semi Hermetic compressors,the suction vapor is used to Answer: Cools the motor 6. The amount of refrigerant that flows through the orifices of a economizer is determined by the Answer: Difference between the high side and low side pressure 7. The installation of an inline refrigerant cleaning system is advisable: To remove impurities from the system 8. The type of refrigerant system that is least likely to leak refrigerant into the building space that are being cooled: The indirect System 9. The suction pressure of a reciprocating compressor is 65 psig. the dis- charge pressure of this compressor is 120 psig. the atmospheric is 14.7 psi. The compression ratio for the given condition is closest to Answer: 1.69 10. A superheated Vapor is a Answer: Dry vapor above the saturation temperature 11. A refrigerant engineer verifies that a condenser water pump is cavitating. of the following the most likely cause for this condition is Answer: A faulty cooling tower water level controller 12. A centriugal water pump is known as a lift pump when the Answer: the water supply to the pump suction inlet is below the pump level 13. A TEV is used to maintain constant Answer: Evaporator Superheat 14. The chilled water supply to the building is 55F. If the chiller is being used for human comfort, should you be concerned about this, and why?: Yes,this temperature is too high for human comfort purpose 15. The packing gland of a centrifugal pump serves to Answer: The drip part of the packing gland gives the evidence that there is water in the pump 16. Capacity control of a reciprocating hermetic compressor is typically achieved through: operation of the hot gas bypass valve 17. The most important reason to sub-cool the refrigerant in the condenser is to ensure that Answer: A pure liquid refrigerant will enter the metering device 18. A refrigeration engineer is logging reading from a reciprocating system. Compressor discharge temperature have dropped significantly and the suc- tion line pressure is high. which of the following that may causing this set of condition.: An expansion valve that is open to wide 19. A low side float valve is used to maintain Answer: The level of the refrigerant in the evaporator 20. Regarding fire safety, which ASHRAE refrigerant safety classification indi- cates no flammability and lower toxicity?: A1 21. When an expansion valve is operating properly, at the end of the evaporator will contain Answer: Only superheated vapor 22. What information is not contained in a Material Safety Data Sheet-MSDS?- : cost of the material 23. In a steam turbine, what is the function of the kingsbury thrust bearing: - Maintain axial positioning of the rotor shaft 24. A centrifugal water pump is considered to be fully primed when: The pump is full of liquid 25. Copper tubing refrigerant lines must be installed for a new system. It is a well known service practice that tubing collapses at bends that must be made, the refrigerant engineer should use: Lever Type Tubing bender 26. A reciprocating compressor is making a knocking sound during operation. If the refrigerant worn parts are not causing the knocking, what is probably the cause: The slugging of the liquid refrigerant 27. In order for a refrigerant to become superheated it must be heated in a section of the low side refrigerant line Answer: Where no liquid refrigerant is present 28. All liquid has been recovered from a system to be overhauled, the system- : Should not be opened until all vapor has been recovered 29. when a refrigerant engineer uses a portable compressor recovery unit to remove vapor refrigerant from a refrigeration system the removal rate of the refrigerant will gradually slow down because: the vapor density is decreasing 30. You are the engineer running a 2000-ton (steam-driven turbine) centrifugal refrigeration system, a refrigeration system supplies chilled water to a college campus with multiple buildings. the panel display on the refrigeration system indicates that the problem is water flow. what do you do?: Add additional make up water to cooling tower 31. A rooftop water cooling tower is connected to a water pump in the building basement with a 12 inches diameter pipe. with the pump turn off, a pressure gauge at the pumps inlet show a pressure of 140 PSIG the height of the water column, in feet, would be closet to.: 323 32. What device protects the steam turbine from excessive speed: Governor assembly 33. A refrigeration compressor has failed to turn on. The refrigeration engineer on duty verifies that the electrical circuit to the motor, including all switches and circuit breakers , is complete according to recommended service practice, the next item to be checked would likely be the Answer: Temperature and pressure controls 34. Refrigerants are characterized by their physical properties included flash- point, refrigeration effect, and others. of the refrigerants in commercial and industrial the highest latent heat and refrigerant effect is Answer: Ammonia 35. On what characteristics is ASHRAE refrigerant safety group classification system Answer: Flammability and toxicity 36. Of the following, and example of an in-line refrigerant cleaning system that may be used with a centrifugal compressor containing R123 refrigerant is Answer: Refrigerant recycling 37. Information about the physical and chemical properties of a hazardous material can be found in Answer: Material Safety Data Sheet 38. What is the function of the turbine auxiliary oil pump?: establish oil pressure during turbine start up 39. The rupture disc for a low-pressure centrifugal refrigeration machine is normally located on the Answer: compressor suction 40. What is the primary reason ribbed metal piping is used for electrical wires connected to the refrigeration system shown below?: it allows for flexibility and accounts for vibrations 41. A multi-cylinder reciprocating compressor uses cylinder unloaders to reg- ulate capacity, what would not occur if some of the unloaders fail to operate when needed?: The chill water temperature will increase 42. As shown in the picture below, the suction gauge of a condenser water pump reads 55 PSI. The pipe supplying the pump is 75 feet long and 12 inches in diameter. approximately how many gallons of water do you expect to obtain if this pipe is drained completely?: 440 43. A water chiller system uses refrigerant uses refrigerant R123. A leak in the evaporator shell mat result in: A higher than normal high side pressure 44. Capacitors are used on refrigeration motors. Of the following, the function of these devices is to?: Store electrical charges during starting and running the motor 45. of the following, centrifugal refrigerant machine is best characterized by:- : High volume low pressure machine 46. which of the following ASHRAE refrigerant safety classification is the most flammmable?: A3 47. which of the following correctly describes the object in the picture below?- : Standpipe hose outlet, to put out fires in case of emergency 48. Modern compressors usually seal the rotating shaft as it exits the com- pressor housing a spring loaded seal made of: Metal or carbon 49. The british thermal unit (BTU) is the measurement of heat of energy. if 10 BTU are transferred to 10 pounds of water, the water temperature increase will be closest to Answer: 1F 50. A reciprocating compressor cylinder has a 10 inches bore and 14 inches stroke . The volume of refrigerant, in cubic inches, will be closer to Answer: 1099 51. An electrically operated control requires 24 volts to operate. to change the availabe 110 volts to 24 volts.: transformer 52. In an indirect refrigeration system, of the following, the one that would not be used as a cooling medium for the building spaces being cooled is Answer: R22 refrigerant 53. On a steam turbine, what would cause the atmospheric valve to open?: All answer are correct 54. You are the engineer running a 2000-ton (steam-driven turbine) centrifu- gal refrigeration system, a refrigeration system supplies chilled water to a college campus with multiple buildings. making your rounds, you notice that condenser water pump#1 is making a lot of noise, the discharger gauge reading of the condenser water pump is fluctuating drastically, and motor of the condenser pump #1 is running very hot. which of the following actions would you take Answer: Turn on pump #2, shut off pump #1, and trouble shot pump #1 55. Electric devices may be used to provide built in defrosting of refrigeration machine evaporator units. These devices are classified as: Resistors 56. The flash point of compressor lubricating oil Answer: Should be higher than the compression temperature 57. The primary way of achieving capacity control of a centrifugal compressor is by Answer: Adjustment of the impeller inlet pre-rotation vanes 58. Cooling tower water requires the addition of chemical additives in order to Answer: Reduce the formation of scale and algae 59. In the picture below describe the equipment's function: Remove non con- densable from the condenser 60. The viscosity of lubrication oil is described by a number. A low viscosity number describes oil that Answer: Flows Easily 61. The most likely reason for a refrigeration engineer to use a psychrometer is to measure Answer: Relative humidity level of the atmosphere 62. The most important reason to use at least two compressors in a cascade system is to Answer: Avoid very high compression ratio for each compressor 63. The suction service valve of a reciprocating compressor is front seated and the compressor runs until the low pressure cut- out shut the compressor off. when the machine is stopped, the refrigeration engineer notices that the suction pressure increase rapidly. The most probable cause of this pressure rise Answer: Malfunction of a compressor valve 64. Regarding the functioning of a steam turbine, why is it advisable to keep moisture in the inlet low as possible?: Keeps turbine blades wear to minimum 65. According to the attached Material Safety Data Sheet(MSDS) R134 is a: - Clear,odorless liquid and vapor 66. Under normal condition, The refrigerant enters the compressor as a Answer: low pressure superheated vapor and leaves as a high pressure vapor 67. While operating an R-22 single acting compressor system, the refriger- ation engineer noticed oil foaming in the crankcase. This is condition most likely, would have been cause by a Answer: Sudden drop in the crankcase pressure 68. Assume that an engineer is able to observe refrigerant water and oil together. The fluids would settle in the container from top to bottom Answer: Oil, water, refrigerant 69. what is the function of the vacuum breaker in a steam turbine.: To achieve a faster coast down cycle 70. An equalizer line on a tev is used to Answer: Compensate for the pressure drop across the evaporator coil 71. If R134 accidentally touches a refrigerant engineers skin, what first aid should be applied from the MSDS?: Promptly flush skin with water until all chem- ical is removed 72. In a multi stage centrifugal compressor , each stage Answer: is identical in volume to the other stages 73. A refrigeration engineer notices excessive cycling of the temperature control for a reciprocating compressor refrigeration unit. The crankcase tem- perature is high, the compressor discharge temperature low, the suction line temperature is high. of the following the one that may causing this set of condition.: Faulty compressor valves 74. On an operating centrifugal compressor refrigerant unit, the refrigeration engineer notices that the compressor is short cycling. The unit is using a low side float valve as a metering device. Of the following requirements, this would indicate that Answer: The system is undercharged with refrigerant 75. The vessel depicted below may used in connection with: Refrigerant recov- ery 76. A refrigeration system uses jet ejector to raise settled oil mixed with refrigerant to oil a restriction in the refrigerant flow to the jet ejector develops Answer: There may be insufficient head to lift the oil 77. An indirect low temperature refrigerant system frequently uses glycol, instead of salt brine, as the intermediate cooling medium. An advantage of this choice is Answer: The elimination of corrosion 78. In relation to the suction pressure of a compressor, the reading on the oil pressure gauge should read in the range, closer to Answer: 15 to 30 PSI higher 79. non-condensable gases like air,oil vapor, or nitrogen travel through a refrigerant system with the refrigerant they usually accumulate in the Answer: Con- denser 80. The advantage of forced draft cooling tower over natural draft cooling towers is Answer: Smaller tower size 81. The sole refrigeration engineer on duty in a building is permitted to leave the building refrigeration system when it is in operation only when: Relieved by another licensed refrigeration engineer 82. A system controlled by a tev show high discharge pressure and high normal sub cooling. The cause is most probably a Answer: Refrigerant overcharge 83. Which of following is a correct statement?: 2.5 gallons of water weighs 20.8 pounds 84. Liquid level gauge glasses (except the bull's eye) are generally equipped with Answer: Automatic shut- off valves only 85. copper and aluminum are frequently used for condenser tubes in refrig- eration system. these metals are used because of their Answer: high heat transfer coefficient 86. Assume that a refrigeration engineer has a choice of four valves to select from. Which of the following is the most effective type of valve to control pressure?: Plug valve 87. Where must the material safety data sheet be located?: Where available to all employees 88. The oil collected in an oil separator is generally Answer: Returned to the compres- sor 89. What is the function of gland steam?: Seal the turbine rotor carbon rings 90. Regarding the functioning of a steam turbine, how is the water level controlled in the surface condenser hot well?: operation of the recirculation and overboard valves 91. The cause of a starved evaporator might be: Low refrigerant charge 92. A refrigeration engineer is running two centrifugal condenser water pumps in parallel. One of the pumps is at maximum pumping rate. if by mistake, the refrigeration engineer throttles back on the discharge valve of the other pump, the most likely effect will be Answer: a reduction on the total flow rate to the condenser 93. The total amount of heat to be removed from the refrigerant in a condenser equals the heat picked up in the Answer: evaporator plus the heat of compression 94. The amount of electrical power used to operate a solenoid valve or a motor is measured in Answer: volts 95. Of the following, the most common metering device used today in recipro- cating commercial refrigeration system under three tons capacity is Answer: TEV 96. The purpose of wear rings in a centrifugal pump is to Answer: Prevent wearing of the pump housing and impeller 97. You are the engineer running a 2000-ton (steam-driven turbine) centrifugal refrigeration system, a refrigeration system supplies chilled water to a college campus with multiple buildings. while making rounds, you notice that the condenser water coming back down from the 9-cell cooling on the roof is a t a temperature of 90f. you want to make a adjustment to bring the temperature of the condenser water down to 85f. Which of the following immediate actions would you take?: increase the speed of the cooling tower fans 98. A water chiller is equipped with a reciprocating compressor. a thermostatic expansion valve and an air cooled condenser. A restriction in the refrigerant liquid line would result in Answer: High suction superheat 99. A Solenoid valve is used to allow a reciprocating refrigeration machine to adapt to the load on the system. The opening of the solenoid valve is cause by Answer: An electrical current creating a magnetic field 100. The process by which refrigerant is extracted and cleaned for reuse without requirements is called: Recycle 101. A centrifugal compressor is in operation with suction pressure is 3 psig and the discharge is 10 psi what is the atmospheric pressure is 14.7 which is ratio closet to Answer: 1.39 102. You are the engineer running a 2000 ton(steam-driven turbine) centrifugal refrigeration system, a refrigeration system supplies chilled water to a college campus with multiple buildings . The panel display on the refrigeration system indicates that the problem is water flow. What do you do?: Check the condenser water pump and restart the refrigeration system. 103. Electrical current is measured in: Amperage 104. How would you put an additional pump online?: Open suction valve, open discharge valve gradually 105. Of the following,The major advantage of a shell and coil condenser is: There is less dangers of developing leaks 106. An engineer needs to vary the flow of the refrigerant in a refrigeration system.Which operation in the flow of the system does not include Answer: Solenoid Valve 107. thermal bulb is attached to the suction pipe between the evaporator coil and the compressor by an insulated line. assume that the machinery room is at 85F. break down of the insulation results in Answer: flood the evaporator 108. A chill water system uses refrigerant R134 a leak in the evaporator shell may result in Answer: Set off the refrigerant monitor alarm 109. What are steam ejector used for on the surface condenser of a system with a turbine: To create a proper operating exhaust vacuum 110. Water and moisture is serious problem in a refrigerant system how to avoid Answer: proper evacuation at the charging of the system 111. The most important requirements for a good evaporator is that Answer: it must have enough cooling surface to absorb the required heat 112. while on duty a refrigeration notice that the suction line to the compressor and part of the compressor itself is frosted of the following,The most likely reason for this condition would be Answer: there is not enough refrigerant in the system 113. While doing a routine line inspection, the engineer notices the bulb of the tev on the floor refrigerant engineer should attach bulb at the Answer: The outlet end of the coil 114. To convert water at 32F to ice at the same temperature a refrigeration system must remove Answer: The latent heat of fusion 115. The use of oil in the refrigeration machine is to Answer: Reduce wear and friction in the compressor parts 116. The following is a desirable property in a refrigeration: High Latent Heat 117. The cooling medium for an evaporative condenser is Answer: Air and Water 118. The ratio of the actual pressure of water vapor in the atmosphere to the saturated pressure of give temperature is Answer: Relative humidity 119. The only refrigerant/ temperature chart available to a refrigerant engineer list the temperature is degrees Celsius if the chart indicates a Celsius temper- ature of 4 degrees to equivalent to F Answer: 39.2 120. A refrigerant engineers was instructed to charge of 60 ton plant with R134A refrigerant. the refrigerant engineer will most likely find the charging valve on the: Low pressure side of the system 121. A refrigerant engineer verifies that a chilled water pump is cavitating. of the following the most likely cause for this condition is Answer: Water leaks through the mechanical seals 122. There is a decrease in the efficiency of a reciprocating compressor. This mostly likely caused by Answer: Leaking suction valve 123. The suction and discharge valve of the reciprocating compressor are mounted as follows Answer: Discharge valve on top of the valve plate and suction valve below 124. You are the engineer running a 2000 ton(steam-driven turbine) centrifugal refrigeration system, a refrigeration system supplies chilled water to a college campus with multiple buildings. while making your rounds you notice that the discharge pressure of your condenser water pumps is significantly lower than the normal. Which following action would you avoid taking Answer: Put on an additional surface condenser pump and lower the chilled water set point. 125. A water pump is discharge against head 92 feet of water, this is approxi- mately to a pressure of Answer: 40 psi 126. Which one of the following will connect to the middle port on a gauge manifold?: Vacuum pump 127. The most important reason for installing a muffler in reciprocating refrig- erant machine is Answer: To contain compressor pulsation noise 128. of the following, the statement that most accurately characterize a her- metic compressor is that it Answer: Will have both the compressor and motor enclosed is gas tight housing 129. In this picture the valve is in what position: Valve Handle at 45 degree: The valve is cracked open 130. What is the order of components on the liquid line of a reciprocating system from the condenser to tev?: King Valve,filter drier,Solenoid valve,sight glass 131. A high-side float valve is used to maintain Answer: Constant level of refrigerant in the evaporator 132. Picture of a pump?: Ninety degree reducing elbow, pump suction, pump casing, pump discharge, check valve 133. Picture of a compressor: Oil charging port allows for the addition and removal of oil from the compressor 134. A facility has failed to maintain water treatment to a refrigerant system:- : increase in the condenser pressure 135. Which of these compressors is not a positive displacement type com- pressor: centrifugal 136. Where is emergency power not required according to code?: Data Centers 137. What is the most widely used regulation book by operating engineers is?: EPA 138. What type if refrigerant do you need FDNY approval for?: Propane 139. Centrifugal pressure is determined by?: speed of motor 140. A single phase 208 VAC circuit has 2 hot wires and the third is?: Ground 141. Liquid refrigerant that has passed through a metering device is a?: Low pressure saturated liquid 142. With a 75 degree dry bulb and a 73 degree wet bulb the relative humidity is?: Very high 143. After recovering the liquid refrigerant from a centrifugal chiller the next step is to?: Recover vapor 144. Where is the muffler located?: Between the compressor and the condenser 145. what is not required to be serviced annually?: Compressors 146. What is the advantage of a shell and tube condenser, as opposed to a shell and coil condenser?: Better heat transfer 147. Fusible plugs on a condenser: The melting point is marked on it 148. How much extra refrigerant can be stored in a machine room?: 330 lbs. 149. What is used on an outside pipe to prevent it from freezing?: Resistor 150. Of the following centrifugal chillers are best characterized as?: High ton- nage,Low pressure machines 151. As an engineer you notice pressure drops across the evaporator. you check and notice the external equalizer line is disconnected. what will occur in the evaporator?: Evaporator will flood 152. When entering Phase 11 fireman's service what statement is correct?: - The elevator operator is the only person that could control the elevator 153. A FDNY permit is required to conduct hot works for?: Use of oxygen and flammable gas 154. FDNY is most concerned with which ASHRAE refrigerant classification?- : A3 155. How long must a fire alarm log book be kept: 3 years 156. What is the minimum requirement an engineer needs to log readings?: - Once per shift 157. You are the only engineer on duty with a machine running. A vice presi- dent tells you to shovel snow. What should you do?: Do not leave building 158. How often must you do emergency power testing?: monthly 159. What is the responsibility of a B29 CoF Holder?: Inspect the battery system 160. Why is a refrigerant gauge called a compound gauge?: it reads positive pressure and vacuum 161. Which of the following does not require flame resistant treatment?: Art work in a museum 162. An engineer observes a gauge that reads saturation pressure of a refrig- erant. if a chilled water is circulate as the cooling medium this reading best be used to estimate the?: Temperature of chilled water being pumped to the spaces being cooled 163. Regardless of the ASHRAE refrigerant classification in use, in the event of a refrigerant escape the engineer should be aware of?: Asphyxiation 164. What type of refrigerant is found inside the machines gauges?: Same type of refrigerant inside the machine 165. if resistance is cut in half, what happens to the power factor?: Increases by a factor of two 166. What are pre hot works procedures performed prior to hot works?: Check area once a day leading up to hot works 167. A chilled water system has an air cooled condensing unit on a roof during cold weather has what type of protection: Air limiting device 168. What is a compressor safety head?: A spring on the valve plate 169. Standpipe certificate should be available for Answer: FDNY and building inspector 170. When is a chemical fire extinguisher system needed?: where water is not sufficient 171. What is most accurate about fire alarm books?: Must be kept in the fire alarm panel 172. What is the volume of a box 12*12*12 measure?: 1 cubic foot 173. A condenser pump is supplied with 85 degree water from a cooling tower and returns to the tower at 88 degrees engineer is sure the condenser tubes are clean and free of obstructions. the condenser has high condenser pressure. the reason for this could be?: Over charge of refrigerant 174. Fireproof decorations n buildings is useful for?: Don't catch fire in an emergency 175. What is the lowest temperature a cooling tower can be?: wet bulb temper- ature 176. Manifold hoses should be equipped with?: low loss fittings 177. Water regulating valves are used to?: Maintain condenser pressure to a pre-determined level 178. What type of sprinkler system needs inspecting?: automatic 179. You are performing hot works near a sprinkler head. what can you do to prevent the fire alarm from going off?: put a non-combustible barrier to protect the sprinkler head 180. How long does it take to warm up a steam turbine?: 10-15 minutes 181. Why is a pressure relief valve better than a fusible plug: minimizes refrig- erant loss 182. What is the state of refrigerant entering the compressor on a reciprocat- ing machine?: Superheated Vapor 183. In the absence of water chemical treatment of a cooling tower?: Drain the tower every one to two weeks & replace with fresh water 184. What is ammonia's refrigerant ASHRAE classification?: B2 185. What is the function of a safety head on a compressor?: Prevents liquid slugging from damaging the valve plate 186. What does a wiring diagram display?: Wiring of components 187. Filter dries remove: Moisture and particles 188. Show a picture of an insulated pump and ask what is this pump?: Cen- trifugal chill water pump 189. if 29.92" HG is equal to 14.7 Psia then 26" HG converts to what in Psia: 12.77 190. When charging refrigerant on the low side of a reciprocating machine with manifold gauges, what is the position of the manifold?: High side frontseated low side backseated 191. You are the engineer running a 2000 ton steam driven turbine centrifugal refrigeration system supplying chilled water to a college campus with multiple buildings. you are supplying 46 degree chilled water. All the buildings are satisfied except on building. What action should the engineer do?: Put an additional chilled water pump online 192. The cooling medium for a cooling tower is?: air 193. The charge in a TEV sensing bulb is?: Similar to refrigerant in system 194. When are you finished leak testing with R22 and nitrogen the next step would be?: Vent refrigerant and nitrogen to open air 195. What is the device used to measure the speed of a turbine?: Tachometer 196. The condenser pump is on the first floor and not running. The pressure gauge shows 55 psi. There is 15 feet for each floor. What floor is the cooling tower on?: 8 197. There is 7.48 gallons per cubic foot. How many gallons of water are in a pipe 8 feet in diameter and 10 feet long?: 3758 198. A technician has been asked to estimate the cost of operating a 5 horse power motor. Because the plant is build by energy consumed as kilo- watt-hours, the technician will have to calculate the conversion. The equivalent in energy of a 5 horsepower motor operating for 9 hours in kilowatt-hours is closest to Answer: 33.6 199. A standpipe system will be out of service for two days. How long should there be a fire watch?: The entire time the standpipe is out of service 200. A circuit breaker has a similar function as what?: A fuse 201. How do you start a centrifugal chiller?: Start the chilled water pump, start the condenser water pump, check oil, start cooling tower, start compressor 202. If a sprinkler system is offline for two days how often do you need to inspect it until it is returned back to service?: continuously 24 hours a day until system is restored 203. The only refrigerant/ temperature chart available to a refrigerant engineer list the temperature is degrees Celsius if the chart indicates a Celsius temper- ature of 5 degrees to equivalent to F Answer: 41 204. In the picture below what does the equipment detect?: Refrigerant leaks 205. In a building with a multizone standpipe system, how does each zone get supplied with water?: each zone will have its own automatic water supply 206. Which service valve should be installed to isolate a dual pressure relief valve while keeping system in service?: Three way valve 207. When will the BTU's exchanged be the greatest?: Low evaporator temper- ature, high condenser temperature 208. You find that the check valve on a centrifugal pump is leaking. When would the most damage be caused to the pump?: on startup of the pump 209. A motor winding is touching the inside of the motor housing. This could result in Answer: shock may occur to personnel 210. An engineer suspects a short of the motor winding's have caused the motor to trip on overload. the engineer should use what instrument to check the motor Answer: Ohmmeter 211. An engineer would expect a relief valve to start function at a pressure Answer: - Design pressure 212. How many BTU's are removed in a 30 ton system: 360,000 BTU's per hour 213. An engineer is requested to replace a gauge on the high side of the system. The pressure graduation rate should be: At least 1.2 times the design pressure 214. An automatic expansion valve maintains a constant Answer: Evaporator pressure 215. During inspection of a facility you notice that there has been failure to maintain water treatment of the condenser water. The first evidence of a problem would be Answer: An increase in compressor head pressure 216. If the air louvers below the fans in an induced draft cooling tower become clogged the result would be Answer: Higher return water temperature 217. You have a cold front and there is a sudden drop in temperature. The thermostat will cause the solenoid valve to Answer: Close and pump the compressor down and shut down on low pressure 218. Cross connections and standpipe risers must be painted Answer: Red 219. Under certain circumstances is it ok to chain an exit door?: no, it is never ok 220. How would you calibrate a thermometer?: Place the thermometer in a cup of ice water 221. What Device automatically controls the speed of a steam turbine: Gover- nor valve 222. What happens when a steam turbine reaches critical speed?: Turbine will vibrate violently