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Consider the following statements regarding the throttling process of wet steam:   
1. The steam pressure and temperature decrease but enthalpy remains constant.
2. The steam pressure decreases, the temperature increases but enthalpy remains constant.
3. The entropy, specific volume, and dryness fraction increase.
4. The entropy increases but the volume and dryness fraction decrease.
Which of the above statements are correct?
  • a)
    1 and 4
  • b)
    2 and 3
  • c)
    1 and 3
  • d)
    2 and 4
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements regarding the throttling process of ...
Explanation:

The process of throttling involves the expansion of steam through a small orifice or valve with a significant pressure drop. During this process, the steam undergoes certain changes in its properties.

Statement 1: The steam pressure and temperature decrease but enthalpy remains constant.

During throttling, there is a decrease in steam pressure due to the expansion. As a result, the temperature of the steam also decreases. However, the enthalpy of the steam remains constant because throttling is an isenthalpic process. The enthalpy of steam is a function of its pressure and temperature, and since the pressure decreases while the temperature decreases, the enthalpy remains constant.

Therefore, statement 1 is correct.

Statement 2: The steam pressure decreases, the temperature increases but enthalpy remains constant.

This statement is incorrect. In the throttling process, the steam pressure decreases, but the temperature also decreases due to the expansion. The enthalpy remains constant, as explained in statement 1.

Therefore, statement 2 is incorrect.

Statement 3: The entropy, specific volume, and dryness fraction increase.

During throttling, the entropy of the steam increases. This is because the throttling process is irreversible, and irreversible processes are associated with an increase in entropy. The specific volume of the steam also increases due to the expansion. The dryness fraction, which is the ratio of the mass of dry steam to the total mass of the steam, also increases during throttling.

Therefore, statement 3 is correct.

Statement 4: The entropy increases but the volume and dryness fraction decrease.

This statement is incorrect. As explained in statement 3, the entropy, specific volume, and dryness fraction all increase during throttling. The volume and dryness fraction increase due to the expansion, while the entropy increases due to the irreversible nature of the process.

Therefore, statement 4 is incorrect.

In summary, the correct statements regarding the throttling process of wet steam are:

1. The steam pressure and temperature decrease but enthalpy remains constant.
3. The entropy, specific volume, and dryness fraction increase.

Therefore, the correct answer is option C, which includes statements 1 and 3.
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Consider the following statements regarding the throttling process of wet steam: 1. The steam pressure and temperature decrease but enthalpy remains constant.2. The steam pressure decreases, the temperature increases but enthalpy remains constant.3. The entropy, specific volume, and dryness fraction increase.4. The entropy increases but the volume and dryness fraction decrease.Which of the above statements are correct?a)1 and 4b)2 and 3c)1 and 3d)2 and 4Correct answer is option 'C'. Can you explain this answer?
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Consider the following statements regarding the throttling process of wet steam: 1. The steam pressure and temperature decrease but enthalpy remains constant.2. The steam pressure decreases, the temperature increases but enthalpy remains constant.3. The entropy, specific volume, and dryness fraction increase.4. The entropy increases but the volume and dryness fraction decrease.Which of the above statements are correct?a)1 and 4b)2 and 3c)1 and 3d)2 and 4Correct 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 Consider the following statements regarding the throttling process of wet steam: 1. The steam pressure and temperature decrease but enthalpy remains constant.2. The steam pressure decreases, the temperature increases but enthalpy remains constant.3. The entropy, specific volume, and dryness fraction increase.4. The entropy increases but the volume and dryness fraction decrease.Which of the above statements are correct?a)1 and 4b)2 and 3c)1 and 3d)2 and 4Correct 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 Consider the following statements regarding the throttling process of wet steam: 1. The steam pressure and temperature decrease but enthalpy remains constant.2. The steam pressure decreases, the temperature increases but enthalpy remains constant.3. The entropy, specific volume, and dryness fraction increase.4. The entropy increases but the volume and dryness fraction decrease.Which of the above statements are correct?a)1 and 4b)2 and 3c)1 and 3d)2 and 4Correct answer is option 'C'. Can you explain this answer?.
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