# Consider supersonic flow near a corner (at an angle $\theta$ from the horizontal) with an attached oblique shock (at an angle $\beta$ with horizontal) as shown in figure. If Mach number $M$ decreases gradually from a high supersonic value, which of the following statements is correct? (A) $\beta$ will decrease if the shock is a weak shock (B) $\beta$ will decrease if the shock is a strong shock (C) $\beta$ will increase for both weak and strong shocks (D) $\beta$ remains unchanged for both weak and strong shocks

## Question ID - 155882 :- Consider supersonic flow near a corner (at an angle $\theta$ from the horizontal) with an attached oblique shock (at an angle $\beta$ with horizontal) as shown in figure. If Mach number $M$ decreases gradually from a high supersonic value, which of the following statements is correct? (A) $\beta$ will decrease if the shock is a weak shock (B) $\beta$ will decrease if the shock is a strong shock (C) $\beta$ will increase for both weak and strong shocks (D) $\beta$ remains unchanged for both weak and strong shocks

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Answer Key : (B) -

(B) $\beta$ will decrease if the shock is a strong shock

Next Question :

The streamlines of a potential line vortex is concentric circles with respect to the vortex center as shown in figure. Velocity along these streamlines, outside the core of the vortex can be written as, $v_{\theta}=\frac{\Gamma}{2 \pi r},$ where strength of the vortex is $\frac{\Gamma}{2 \pi}$ and $r$ is radial direction. The value of circulation along the curve shown in the figure is:

(A) $\Gamma$
(B) $-2 \Gamma$
(C) $2 \Gamma$
(D) 0