Question

In a throttling process, which one of the parameters remains constant?

• A. Temperature
• B. Pressure
• C. Enthalpy
• D. Entropy

Hint:

In a throttling process, always remember that enthalpy is constant due to the adiabatic and irreversible nature of the process.

Answer 1

The Correct Option is C

In a throttling process, which is an adiabatic, irreversible expansion, there is no heat exchange with the surroundings. The process is typically characterized by a constant enthalpy, meaning the total heat content of the fluid remains unchanged. This is why enthalpy is the key parameter that remains constant in such a process.
On the other hand, temperature, pressure, and entropy typically change during throttling. The temperature and pressure may drop or increase depending on the specific conditions, while entropy may also change due to the irreversibility of the process.
Thus, the correct answer is enthalpy, as it remains constant in a throttling process.