Mechanical Engineering Exam > Mechanical Engineering Questions > If steam is throttled itsa)pressure and entha...
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If steam is throttled its
- a)pressure and enthalpy remain unchanged
- b)temperature and entropy remain unchanged
- c)enthalpy remains unchanged but the other property change
- d)enthalpy remains unchanged but pressure may or may not chan
Correct answer is option 'C'. Can you explain this answer?
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If steam is throttled itsa)pressure and enthalpy remain unchangedb)tem...
If steam is throttled , its enthalpy remains constant and pressure drop takes place
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If steam is throttled itsa)pressure and enthalpy remain unchangedb)tem...
Understanding Throttling of Steam
Throttling is a process where a fluid's pressure is reduced through a restriction, such as a valve or a nozzle, without any heat exchange with the environment. In the case of steam, this process has specific thermodynamic implications.
Key Properties During Throttling
- Enthalpy Remains Unchanged:
When steam undergoes throttling, the enthalpy (h) remains constant. This is due to the nature of the throttling process being adiabatic (no heat transfer) and irreversible. The energy that was in the form of pressure energy converts into kinetic energy as the steam passes through the restriction, but the total energy (enthalpy) remains the same.
- Pressure Changes:
In a throttling process, the pressure of the steam decreases due to the restriction. Therefore, while enthalpy remains constant, pressure does not; it drops significantly as the steam flows through the valve or nozzle.
- Temperature and Entropy:
The temperature of the steam does not remain unchanged. It may drop or rise depending on the initial state and the specific throttling conditions. Similarly, the entropy (s) of the steam increases during throttling, as the process is irreversible and generates more disorder in the fluid.
Conclusion
Thus, the correct option is that "enthalpy remains unchanged but the other property changes," highlighting the nature of throttling in thermodynamic systems. The throttling process is vital in various engineering applications, including refrigeration and power generation systems.
Throttling is a process where a fluid's pressure is reduced through a restriction, such as a valve or a nozzle, without any heat exchange with the environment. In the case of steam, this process has specific thermodynamic implications.
Key Properties During Throttling
- Enthalpy Remains Unchanged:
When steam undergoes throttling, the enthalpy (h) remains constant. This is due to the nature of the throttling process being adiabatic (no heat transfer) and irreversible. The energy that was in the form of pressure energy converts into kinetic energy as the steam passes through the restriction, but the total energy (enthalpy) remains the same.
- Pressure Changes:
In a throttling process, the pressure of the steam decreases due to the restriction. Therefore, while enthalpy remains constant, pressure does not; it drops significantly as the steam flows through the valve or nozzle.
- Temperature and Entropy:
The temperature of the steam does not remain unchanged. It may drop or rise depending on the initial state and the specific throttling conditions. Similarly, the entropy (s) of the steam increases during throttling, as the process is irreversible and generates more disorder in the fluid.
Conclusion
Thus, the correct option is that "enthalpy remains unchanged but the other property changes," highlighting the nature of throttling in thermodynamic systems. The throttling process is vital in various engineering applications, including refrigeration and power generation systems.
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If steam is throttled itsa)pressure and enthalpy remain unchangedb)temperature and entropy remain unchangedc)enthalpy remains unchanged but the other property changed)enthalpy remains unchanged but pressure may or may not chanCorrect answer is option 'C'. Can you explain this answer?
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If steam is throttled itsa)pressure and enthalpy remain unchangedb)temperature and entropy remain unchangedc)enthalpy remains unchanged but the other property changed)enthalpy remains unchanged but pressure may or may not chanCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about If steam is throttled itsa)pressure and enthalpy remain unchangedb)temperature and entropy remain unchangedc)enthalpy remains unchanged but the other property changed)enthalpy remains unchanged but pressure may or may not chanCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If steam is throttled itsa)pressure and enthalpy remain unchangedb)temperature and entropy remain unchangedc)enthalpy remains unchanged but the other property changed)enthalpy remains unchanged but pressure may or may not chanCorrect answer is option 'C'. Can you explain this answer?.
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