Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following statements:1. De Laval...
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Consider the following statements:
1. De Laval nozzle is a subsonic nozzle.
2. Supersonic nozzle is a converging passage.
3. Subsonic diffuser is a diverging passage.
Which of these statements is/are correct?
1. De Laval nozzle is a subsonic nozzle.
2. Supersonic nozzle is a converging passage.
3. Subsonic diffuser is a diverging passage.
Which of these statements is/are correct?
- a)1 and 2
- b)2 and 3
- c)1 alone
- d)3 alone
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Consider the following statements:1. De Laval nozzle is a subsonic noz...
(d) Only third statement is correct, i.e. subsonic diffuser is a diverging passage.
Most Upvoted Answer
Consider the following statements:1. De Laval nozzle is a subsonic noz...
Understanding the Statements
To evaluate the correctness of each statement regarding nozzles and diffusers, let’s break them down:
1. De Laval nozzle is a subsonic nozzle.
- This statement is incorrect. The De Laval nozzle is designed to accelerate flow from subsonic to supersonic speeds. It consists of a converging section followed by a diverging section, allowing it to achieve supersonic flow.
2. Supersonic nozzle is a converging passage.
- This statement is also incorrect. A supersonic nozzle typically has a converging-diverging design. The converging section accelerates the flow to sonic speeds, and the diverging section allows the flow to expand and achieve supersonic speeds.
3. Subsonic diffuser is a diverging passage.
- This statement is correct. A subsonic diffuser is designed to decelerate the flow, and it achieves this through a diverging passage. The increase in cross-sectional area allows the fluid velocity to decrease while the pressure increases.
Conclusion
Based on the evaluations above:
- Only the third statement is correct. Therefore, the answer is option D: "3 alone."
This conclusion highlights the unique characteristics of different nozzle and diffuser designs in fluid mechanics, particularly their roles in managing flow speeds effectively.
To evaluate the correctness of each statement regarding nozzles and diffusers, let’s break them down:
1. De Laval nozzle is a subsonic nozzle.
- This statement is incorrect. The De Laval nozzle is designed to accelerate flow from subsonic to supersonic speeds. It consists of a converging section followed by a diverging section, allowing it to achieve supersonic flow.
2. Supersonic nozzle is a converging passage.
- This statement is also incorrect. A supersonic nozzle typically has a converging-diverging design. The converging section accelerates the flow to sonic speeds, and the diverging section allows the flow to expand and achieve supersonic speeds.
3. Subsonic diffuser is a diverging passage.
- This statement is correct. A subsonic diffuser is designed to decelerate the flow, and it achieves this through a diverging passage. The increase in cross-sectional area allows the fluid velocity to decrease while the pressure increases.
Conclusion
Based on the evaluations above:
- Only the third statement is correct. Therefore, the answer is option D: "3 alone."
This conclusion highlights the unique characteristics of different nozzle and diffuser designs in fluid mechanics, particularly their roles in managing flow speeds effectively.
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Consider the following statements:1. De Laval nozzle is a subsonic nozzle.2. Supersonic nozzle is a converging passage.3. Subsonic diffuser is a diverging passage.Which of these statements is/are correct?a)1 and 2b)2 and 3c)1 aloned)3 aloneCorrect answer is option 'D'. Can you explain this answer?
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