The figure shows schematics of wave patterns at the exit of nozzles A and B operating at different pressure ratios.
Nozzles A and B, respectively, are said to be operating in:
The figure shows schematics of wave patterns at the exit of nozzles A and B operating at different pressure ratios.
Nozzles A and B, respectively, are said to be operating in:
Show Hint
- over-expanded mode and under-expanded mode
- under-expanded mode and perfectly expanded mode
- perfectly expanded mode and under-expanded mode
- under-expanded mode and over-expanded mode
The Correct Option is A
Solution and Explanation
Step 1: Examine Nozzle A.
In Nozzle A, oblique shocks are seen at the nozzle exit. Shocks indicate that the exit pressure is higher than the ambient pressure. This situation occurs when the nozzle is operating in an over-expanded condition, causing the flow to compress through shock waves.
Step 2: Examine Nozzle B.
In Nozzle B, only expansion fans appear at the exit. Expansion waves occur when the exit pressure is greater than the ambient pressure. This means the nozzle is operating in an under-expanded mode, allowing further expansion after exiting the nozzle.
Step 3: Conclusion.
Therefore, Nozzle A is over-expanded and Nozzle B is under-expanded.
Final Answer: (A) over-expanded mode and under-expanded mode
Top Questions on Nozzle and Diffuser
Questions Asked in GATE AE exam
Courage : Bravery :: Yearning :
Select the most appropriate option to complete the analogy.In the given figure, the numbers associated with the rectangle, triangle, and ellipse are 1, 2, and 3, respectively. Which one among the given options is the most appropriate combination of \( P \), \( Q \), and \( R \)?
- A lifting surface has a spanwise circulation distribution of \( \Gamma(\theta) = A \sin 3\theta \) (where \( A \neq 0 \)) over its span \( -\frac{b}{2} \leq y \leq \frac{b}{2} \), and \( y = -\frac{b}{2} \cos \theta \) is the spanwise coordinate. Furthermore, the downwash varies along the span as \( w(\theta) = V_\infty \left( \frac{3A \sin 3\theta}{\sin \theta} \right) \), where \( V_\infty \) is the freestream velocity. Which one of the following options represents the total lift \( L \) and induced drag \( D_i \)?
- GATE AE - 2025
- Lift and Circulation
A regular dodecagon (12-sided regular polygon) is inscribed in a circle of radius \( r \) cm as shown in the figure. The side of the dodecagon is \( d \) cm. All the triangles (numbered 1 to 12 in the figure) are used to form squares of side \( r \) cm, and each numbered triangle is used only once to form a square. The number of squares that can be formed and the number of triangles required to form each square, respectively, are:
The number of patients per shift (X) consulting Dr. Gita in her past 100 shifts is shown in the figure. If the amount she earns is ₹1000(X - 0.2), what is the average amount (in ₹) she has earned per shift in the past 100 shifts?
