Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following statements:When dry sa...
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Consider the following statements:
When dry saturated steam is throttled from a higher pressure to a lower pressure, the
1. Pressure decreases and the volume increases
2. Temperature decreases and the steam becomes superheated
3. Temperature and the dryness fraction increase
4. Entropy increases without any change in enthalpy
Which of these statements are correct?
- a)1and 4
- b)1, 2 and 4
- c)1 and 3
- d)2 and 4
Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements:When dry saturated steam is throttle...
Temperature decreases and the
steam becomes superheated.
steam becomes superheated.
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Consider the following statements:When dry saturated steam is throttle...
Throttling of Dry Saturated Steam:
When dry saturated steam is throttled from a higher pressure to a lower pressure, the following changes occur:
1. Pressure decreases and the volume increases:
- Due to throttling, the pressure of the steam decreases.
- As a result, the volume of the steam increases.
- This is because the steam expands to fill the available space at the lower pressure.
2. Temperature decreases and the steam becomes superheated:
- Due to throttling, the enthalpy of the steam remains constant.
- However, the kinetic energy of the steam molecules decreases due to the expansion.
- This results in a decrease in temperature.
- If the initial steam was saturated, the steam becomes superheated after throttling.
3. Temperature and the dryness fraction increase:
- This statement is incorrect.
- Throttling of dry saturated steam results in a decrease in temperature and an increase in the dryness fraction of the steam.
4. Entropy increases without any change in enthalpy:
- Entropy is a measure of the degree of disorder or randomness in a system.
- Throttling results in an increase in entropy of the steam without any change in enthalpy.
- This is because the expansion of the steam results in an increase in the number of microstates available to the system, leading to an increase in entropy.
Therefore, the correct statements are 1, 2, and 4.
When dry saturated steam is throttled from a higher pressure to a lower pressure, the following changes occur:
1. Pressure decreases and the volume increases:
- Due to throttling, the pressure of the steam decreases.
- As a result, the volume of the steam increases.
- This is because the steam expands to fill the available space at the lower pressure.
2. Temperature decreases and the steam becomes superheated:
- Due to throttling, the enthalpy of the steam remains constant.
- However, the kinetic energy of the steam molecules decreases due to the expansion.
- This results in a decrease in temperature.
- If the initial steam was saturated, the steam becomes superheated after throttling.
3. Temperature and the dryness fraction increase:
- This statement is incorrect.
- Throttling of dry saturated steam results in a decrease in temperature and an increase in the dryness fraction of the steam.
4. Entropy increases without any change in enthalpy:
- Entropy is a measure of the degree of disorder or randomness in a system.
- Throttling results in an increase in entropy of the steam without any change in enthalpy.
- This is because the expansion of the steam results in an increase in the number of microstates available to the system, leading to an increase in entropy.
Therefore, the correct statements are 1, 2, and 4.
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Consider the following statements:When dry saturated steam is throttled from a higher pressure to a lower pressure, the1. Pressure decreases and the volume increases2. Temperature decreases and the steam becomes superheated3. Temperature and the dryness fraction increase4. Entropy increases without any change in enthalpyWhich of these statements are correct?a)1and 4b)1, 2 and 4c)1 and 3d)2 and 4Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements:When dry saturated steam is throttled from a higher pressure to a lower pressure, the1. Pressure decreases and the volume increases2. Temperature decreases and the steam becomes superheated3. Temperature and the dryness fraction increase4. Entropy increases without any change in enthalpyWhich of these statements are correct?a)1and 4b)1, 2 and 4c)1 and 3d)2 and 4Correct answer is option 'B'. 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:When dry saturated steam is throttled from a higher pressure to a lower pressure, the1. Pressure decreases and the volume increases2. Temperature decreases and the steam becomes superheated3. Temperature and the dryness fraction increase4. Entropy increases without any change in enthalpyWhich of these statements are correct?a)1and 4b)1, 2 and 4c)1 and 3d)2 and 4Correct answer is option 'B'. 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:When dry saturated steam is throttled from a higher pressure to a lower pressure, the1. Pressure decreases and the volume increases2. Temperature decreases and the steam becomes superheated3. Temperature and the dryness fraction increase4. Entropy increases without any change in enthalpyWhich of these statements are correct?a)1and 4b)1, 2 and 4c)1 and 3d)2 and 4Correct answer is option 'B'. Can you explain this answer?.
Consider the following statements:When dry saturated steam is throttled from a higher pressure to a lower pressure, the1. Pressure decreases and the volume increases2. Temperature decreases and the steam becomes superheated3. Temperature and the dryness fraction increase4. Entropy increases without any change in enthalpyWhich of these statements are correct?a)1and 4b)1, 2 and 4c)1 and 3d)2 and 4Correct answer is option 'B'. 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:When dry saturated steam is throttled from a higher pressure to a lower pressure, the1. Pressure decreases and the volume increases2. Temperature decreases and the steam becomes superheated3. Temperature and the dryness fraction increase4. Entropy increases without any change in enthalpyWhich of these statements are correct?a)1and 4b)1, 2 and 4c)1 and 3d)2 and 4Correct answer is option 'B'. 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:When dry saturated steam is throttled from a higher pressure to a lower pressure, the1. Pressure decreases and the volume increases2. Temperature decreases and the steam becomes superheated3. Temperature and the dryness fraction increase4. Entropy increases without any change in enthalpyWhich of these statements are correct?a)1and 4b)1, 2 and 4c)1 and 3d)2 and 4Correct answer is option 'B'. Can you explain this answer?.
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