Question 4Refrigeration/AC - 1st Asst/Chief70% to pass
On a modern refrigerated container unit employing suction modulation for the purposes of capacity control and capacity limitation, what happens when the applied voltage and current draw associated with the normally open (NO) suction modulation valve located in the suction line both increase?
AI Explanation
The correct answer is C) the valve will further close, raising evaporator pressure and lowering suction pressure.
When the applied voltage and current draw to the normally open (NO) suction modulation valve increase, the valve will further close. This is because an increase in voltage and current will cause the valve to actuate and close, restricting the flow of refrigerant through the suction line. As a result, the evaporator pressure will increase, and the suction pressure will decrease.
The other options are incorrect because they do not accurately describe the behavior of the suction modulation valve when the voltage and current draw increase. Increasing the voltage and current will not cause the valve to further open, as that would be the opposite of how the valve is designed to operate.
Related Questions
#2 The fluid used as a source of actuating power against the underside of the unloader power element piston of the refrigeration compressor capacity control mechanism illustrated is obtained from where? Illustration GS-RA-13 #3 During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when all of the evaporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston will be at what value? Illustration GS-RA-13 #5 A refrigeration compressor used in a multi-box refrigeration system is designed with six of its eight cylinders able to be controlled for variable load conditions. If all of the reefer boxes are currently feeding, what percentage of the total number of compressor cylinders will be loaded after start up? #6 To prevent motor overload during start-up of a hermetically sealed centrifugal refrigeration system, what is true concerning the compressor suction gas variable inlet guide vanes? #7 As shown in the illustrated refrigeration system piping schematic diagram with the various accessories and controls and equipped with an air-cooled condenser with high side pressure controls, what statement is true concerning the fan cycling control pressure switch? Illustration GS-RA-39