RETA TEST 1 EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS A+ VERIFIED LATEST VERSION, Exams of Nursing

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what does temperature indicate - correct answers intensity of heat energy in an object what is required to move heat from one object to another - correct answers temperature difference which of these is required to obtain a valid reading from a pressure temperature chart - correct answers the refrigerant must be in a saturated condition which of these is an essential component of a mechanical refrigeration system - correct answers expansion device what is a function of a compressor in a mechanical refrigeration system - correct answers to accept vapor from the evaporator and compress it to increase its pressure and temperature which of these accurately describes subcooled liquid - correct answers liquid cooled below at saturation pressure what does the term compression ratio refer to - correct answers the ratio of discharge pressure to suction pressure in PSIA which refrigerant is more forgiving to moisture in the refrigeration system - correct answers R-717 which of these is most likely to occur when air leaks into a refrigeration system - correct answers an increase in compressor discharge pressure which of these is the greatest risk from closing valves on each end of a liquid line between a liquid pump and an evaporator during maintenance of an ammonia refrigeration system - correct answers rupture of the line if the liquid warms under what conditions do halocarbon refrigerants become most hazardous - correct answers when did we come in contact with an open flame which of these conditions is indicated in an ammonia condenser operating with 180 PSIG pressure at the drain outlet and 90 degrees Fahrenheit liquid temperature leaving the condenser - correct answers non condensables in the condenser What Will Liquid refrigerant trap in a pipe do when heated - correct answers expand which industrial compressor would be direct drive at 3600 RPM - correct answers screw compressor why is the discharge temperature of a screw compressor lower than the discharge temperature of a reciprocating compressor - correct answers significant quantities of oil flow into the rotor section of a screw compressor how does the intercooler help the low stage compressor and high stage compressor - correct answers by d superheating low stage compressor discharge temperature which of these is the primary responsibility of a refrigeration system operator - correct answers to track system operations in logs and maintenance records which of these functions are required by the operator to complete logs properly - correct answers Monitor and record system temperatures, pressures levels and product temperatures. which of these should be done first when a reciprocating compressor starts to pound or makes an unusual loud noise. - correct answers turn off the compressor. which of these most accurately describes when hydraulic pounding in a reciprocating compressor is taking place. - correct answers when liquid refrigerant enters the compression chamber. which of these methods of moving oil is common in a screw compressor oil management system. - correct answers a mechanical pump to deliver pressure differential over the discharge pressure. which of these is not a typical design characteristic for a screw compressor oil system. - correct answers the oil separator should be six times larger than the oil cooler which statement most accurately describes the refrigeration process - correct answers heat absorbed by liquid refrigerate causes it to change to Vapor. which of these mast accurately describes a secondary refrigerant system. - correct answers liquid refrigerants follow through pipes in a two exchange system. how do fins impact the operation of evaporator coils. - correct answers by increasing the heat exchange surface and deficiency of the cooling unit. which of these is the one disadvantage of an induced draft evaporator. - correct answers the heat of the motor is circulated back into the room by fan air. which statement most accurately describes operation and maintenance of shell and tube condensers in ammonia refrigeration system. - correct answers regular chemical cleaning of all condenser tubes is required to eliminate the risk of condenser pressure Rising as a result of scale inside the tubes. which of these is not an advantage of an induced draft unit over forced air equipment - correct answers the fan horsepower must be significantly greater than comparable air-cooled condensers. what is the importance of wet bulb temperature for evaporative condensers. - correct answers the wet- bulb temperature is the minimum temperature that water on the surface of the condensing unit can be cooled to in the system. which of these should be compared to determine the presence of non condensable gases - correct answers condenser liquid Outlet temperature to condensing pressure. which system is most likely to require an automatic purger. - correct answers R-717 with -40 degrees F evaporating temperature. what is the effect of working in a high noise environment without proper ear protection - correct answers loss of hearing. which statement most accurately describes appropriate extinguisher selection criteria in response toa fire. - correct answers CO2 fire extinguishers are most appropriate to use on oil and electrical fires. which of these is most important to follow when working on a compressor motor in a refrigeration system - correct answers lockout tagout procedures. what is the greatest Hazard when working with electrical equipment - correct answers electrical shock which of these is not part of an employer's responsibility regarding chemical safety - correct answers encourage employees who use a chemical to read it's MSDS.