A typical shipboard domestic multi-box...

Question 1 / 205eccef9dbacbc34ba4d45fc6

Question 1 of 205eccef9dbacbc34ba4d45fc6

A typical shipboard domestic multi-box refrigeration system operates with one compressor and condenser. What is the purpose of the sensing line connected to the thermal bulb at the evaporator coil outlet?

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🔍 Key Concepts

• Thermostatic expansion valve (TXV or TEV) operation in a shipboard refrigeration system • Relationship between bulb temperature, bulb pressure, and refrigerant flow through the expansion valve • What the sensing line actually carries: pressure from where to where

💭 Think About

• Think about what the thermal bulb is strapped to and what change it is trying to detect in the evaporator coil. • When the evaporator outlet gets warmer, what must happen to the refrigerant flow, and which device in the system actually meters that flow? • Ask yourself: does the sensing line move liquid, electrical signals, or pressure, and to which component does it send that signal?

✅ Before You Answer

• Identify which component in the options actually controls refrigerant flow into the evaporator (not just on/off control). • Confirm that the sensing line is associated with temperature-sensitive pressure changes rather than with direct box air temperature or simple solenoid actuation. • Eliminate any choices that confuse evaporator pressure regulation with superheat control at the evaporator outlet.

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Question 1 of 20

To open or close the solenoid valve when the box temperature increases or decreases.

To open the back-pressure regulating valve when evaporator coil pressure increases.

To direct evaporator outlet pressure to the lower part of the solenoid bellows.

To transmit the bulb pressure (proportional to the coil temperature) to the thermal expansion valve diaphragm.

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Question 1 / 205eccef9dbacbc34ba4d45fc6

Question 1 of 205eccef9dbacbc34ba4d45fc6

Back

Question 1 of 20

5eccef9dbacbc34ba4d45fc6

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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