Question 119Refrigeration & AC - Assistant Engineer

70% to pass

Which statement about calibrating a newly installed thermostatic expansion valve is correct?

AThis procedure is done at the factory with tools not available to a mariner.
BThe procedure requires a refrigeration wrench and a digital thermometer to measure box temperature.
CNo special tools are required as long as the solid state circuit control panels are functioning properly.
DAn accurate thermometer and suction pressure gage are essential to this process.
AI Explanation

The correct answer is D) An accurate thermometer and suction pressure gage are essential to this process. Calibrating a newly installed thermostatic expansion valve requires precise measurements of the refrigeration system's suction pressure and temperature. This allows the technician to properly adjust the valve to control the flow of refrigerant and maintain the desired temperature in the refrigerated space. Relying on solid state controls alone is not sufficient, as the thermostatic expansion valve requires specific calibration using a thermometer and pressure gage. Options A, B, and C are incorrect as they do not accurately describe the essential tools and process for properly calibrating this critical refrigeration component.

Related Questions
Q@q.QuestionNumber:Which of the devices listed will indicate whether or not a refrigeration system'... Q@q.QuestionNumber:What is the wet bulb temperature of air if the dry bulb temperature of the air i... Q@q.QuestionNumber:If outside air at 80 degrees F and 70 percent relative humidity is conditioned, ... Q@q.QuestionNumber:Which of the processes listed would be the most satisfactory method to use to lo... Q@q.QuestionNumber:Sea water or low temperature central fresh water is typically provided to a ship...

Ready to test your knowledge?

Take a Refrigeration & AC - Assistant Engineer Practice Exam
Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App