fdny z51 rmo questions answered verified graded A+ updated 2024

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 - CORRECT ANSWER-lowering the condenser pressure In most semi hermetic compressors, the suction vapor is used for - CORRECT ANSWER-cools the motor The amount of refrigerant that flows through the orifices of an economizer is determined by the - CORRECT ANSWER-difference between the high side and the low side pressure the instalation of an inline refrigerant cleaning system is advisable - CORRECT ANSWER-to remove impurities from the system a refrigerant engineer verifies that a condenser pump is cavitation of the following the most likely cause for this condition is: - CORRECT ANSWER-a faulty cooling tower water level controller when an expansion valve is operating properly, at the end of the evaporator will contain - CORRECT ANSWER-only superheated vapor a centrifugal water pump is considered to be fully primed when - CORRECT ANSWER-the pump is full of liquid A refrigeration compressor has failed to turn on. the engineer on duty verifies the electrical circuit to the motor, including all switches and circuit breakers is complete, according to recomended service practice, the next item to be checked would likely be the: - CORRECT ANSWER-temperature and pressure controls Refrigerants are characterized by their physical properties including Flashpoint, refrigeration effect and others, of the refrigerants in commercial and industrial the highest latent heat and refrigerant effect is: - CORRECT ANSWER-ammonia which of the following ashrae refrigerant safety classification is the most toxic - CORRECT ANSWER-b3 which of the following ashrae refrigerant safety classification is the most flammable - CORRECT ANSWER-a3 in q indirect refrigeration system,of the following, the one that would not be used as a cooling medium for building spaces being cooled is - CORRECT ANSWER-r 22 (cooling medium= glycol or any brine solution) the primary way of achieving capacity control of a an centrifugal compressor is by: - CORRECT ANSWER- adjustment to the inlet impeller pre rotation vanes regarding the functioning of a steam turbine, why is it advisable to keep moisture in the inlet low as possible - CORRECT ANSWER-keeps turbine blades wear to minimum a water chiller is equipped with a reciprocating compressor, a thermostatic expansion valve and a an air cooled condenser. A restriction in the refrigerant line would result in - CORRECT ANSWER-high suction super heat