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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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...
De Laval nozzle is a subsonic nozzle:
This statement is incorrect. The De Laval nozzle is actually a supersonic nozzle. It is a specially designed nozzle that is used to accelerate a fluid (usually a gas) to supersonic speeds. It consists of a convergent-divergent passage, which allows the fluid to expand and accelerate to supersonic velocities.
Supersonic nozzle is a converging passage:
This statement is correct. A supersonic nozzle typically consists of a converging section followed by a diverging section. The converging section is designed to accelerate the fluid and increase its velocity, while the diverging section is designed to further accelerate the fluid and allow it to expand to supersonic speeds.
Subsonic diffuser is a diverging passage:
This statement is correct. A subsonic diffuser is a device that is used to slow down and increase the pressure of a fluid that is flowing at subsonic speeds. It typically consists of a diverging passage that allows the fluid to expand and slow down, thereby increasing its pressure.
Explanation:
- The De Laval nozzle is designed to accelerate a fluid to supersonic speeds, so it is a supersonic nozzle, not a subsonic nozzle. The convergent-divergent design of the nozzle allows the fluid to expand and accelerate to supersonic velocities.
- A supersonic nozzle typically consists of a converging section followed by a diverging section. The converging section accelerates the fluid and increases its velocity, while the diverging section allows the fluid to expand and further increase its velocity to supersonic speeds.
- A subsonic diffuser, on the other hand, is a device used to slow down and increase the pressure of a fluid that is flowing at subsonic speeds. It typically consists of a diverging passage that allows the fluid to expand and slow down, thereby increasing its pressure.
Therefore, the correct statements are:
- Supersonic nozzle is a converging passage.
- Subsonic diffuser is a diverging passage.
Hence, option 'D' is the correct answer.
This statement is incorrect. The De Laval nozzle is actually a supersonic nozzle. It is a specially designed nozzle that is used to accelerate a fluid (usually a gas) to supersonic speeds. It consists of a convergent-divergent passage, which allows the fluid to expand and accelerate to supersonic velocities.
Supersonic nozzle is a converging passage:
This statement is correct. A supersonic nozzle typically consists of a converging section followed by a diverging section. The converging section is designed to accelerate the fluid and increase its velocity, while the diverging section is designed to further accelerate the fluid and allow it to expand to supersonic speeds.
Subsonic diffuser is a diverging passage:
This statement is correct. A subsonic diffuser is a device that is used to slow down and increase the pressure of a fluid that is flowing at subsonic speeds. It typically consists of a diverging passage that allows the fluid to expand and slow down, thereby increasing its pressure.
Explanation:
- The De Laval nozzle is designed to accelerate a fluid to supersonic speeds, so it is a supersonic nozzle, not a subsonic nozzle. The convergent-divergent design of the nozzle allows the fluid to expand and accelerate to supersonic velocities.
- A supersonic nozzle typically consists of a converging section followed by a diverging section. The converging section accelerates the fluid and increases its velocity, while the diverging section allows the fluid to expand and further increase its velocity to supersonic speeds.
- A subsonic diffuser, on the other hand, is a device used to slow down and increase the pressure of a fluid that is flowing at subsonic speeds. It typically consists of a diverging passage that allows the fluid to expand and slow down, thereby increasing its pressure.
Therefore, the correct statements are:
- Supersonic nozzle is a converging passage.
- Subsonic diffuser is a diverging passage.
Hence, option 'D' is the correct answer.
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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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