Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following statements :Choked flo...
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Consider the following statements :
Choked flow through a nozzle means:
1. Discharge is maximum
2. Discharge is zero
3. Velocity at throat is supersonic
4. Nozzle exit pressure is less than or equal to critical pressure.
Which of the above statements is/are correct?
Choked flow through a nozzle means:
1. Discharge is maximum
2. Discharge is zero
3. Velocity at throat is supersonic
4. Nozzle exit pressure is less than or equal to critical pressure.
Which of the above statements is/are correct?
- a)1 only
- b)1 and 2
- c)2 and 3
- d)1 and 4
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements :Choked flow through a nozzle means:...
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Consider the following statements :Choked flow through a nozzle means:...
Choked flow through a nozzle refers to a condition where the flow rate of a fluid reaches its maximum value. It occurs when the flow velocity at the throat of the nozzle reaches the speed of sound. Let's analyze each of the given statements to determine which ones are correct.
1. Discharge is maximum: This statement is correct. In choked flow, the flow rate or discharge is at its maximum value. This is because the flow velocity at the throat is at its maximum and cannot increase further.
2. Discharge is zero: This statement is incorrect. Choked flow does not imply that the discharge is zero. Instead, it means that the discharge is at its maximum value.
3. Velocity at throat is supersonic: This statement is incorrect. In choked flow, the velocity at the throat is equal to the speed of sound, which is the maximum velocity that can be achieved in the nozzle. It is not considered supersonic.
4. Nozzle exit pressure is less than or equal to critical pressure: This statement is correct. When choked flow occurs, the pressure at the nozzle exit is equal to or less than the critical pressure of the fluid. The critical pressure is the pressure at which the fluid reaches its critical point, and any decrease in pressure beyond this point will cause the fluid to undergo a phase change.
Therefore, the correct statements are 1 (discharge is maximum) and 4 (nozzle exit pressure is less than or equal to critical pressure). Hence, the correct option is D) 1 and 4.
1. Discharge is maximum: This statement is correct. In choked flow, the flow rate or discharge is at its maximum value. This is because the flow velocity at the throat is at its maximum and cannot increase further.
2. Discharge is zero: This statement is incorrect. Choked flow does not imply that the discharge is zero. Instead, it means that the discharge is at its maximum value.
3. Velocity at throat is supersonic: This statement is incorrect. In choked flow, the velocity at the throat is equal to the speed of sound, which is the maximum velocity that can be achieved in the nozzle. It is not considered supersonic.
4. Nozzle exit pressure is less than or equal to critical pressure: This statement is correct. When choked flow occurs, the pressure at the nozzle exit is equal to or less than the critical pressure of the fluid. The critical pressure is the pressure at which the fluid reaches its critical point, and any decrease in pressure beyond this point will cause the fluid to undergo a phase change.
Therefore, the correct statements are 1 (discharge is maximum) and 4 (nozzle exit pressure is less than or equal to critical pressure). Hence, the correct option is D) 1 and 4.
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Consider the following statements :Choked flow through a nozzle means:1. Discharge is maximum2. Discharge is zero3. Velocity at throat is supersonic4. Nozzle exit pressure is less than or equal to critical pressure.Which of the above statements is/are correct?a)1 onlyb)1 and 2c)2 and 3d)1 and 4Correct answer is option 'D'. Can you explain this answer?
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