- For a flow through a Prandtl-Meyer expansion wave
- Mach number stays constant.
- Entropy stays constant.
- Temperature stays constant
- Density stays constant.

Answer:- Entropy stays constant.

- For two-dimensional irrotational and incompressible flows
- Both potential and stream functions satisfy the Laplace equation
- Potential function must satisfy the Laplace equation but the stream function need not.
- Stream function must satisfy the Laplace equation but the potential function need not
- Neither the stream function nor the potential function need to satisfy the Laplace equation

Answer:- Both potential and stream functions satisfy the Laplace equation

- A trailing edge plain flap deflected downward increases the lifrt coefficient of an airfoil by
- Increasing the effective camber of the airfoil.
- Delaying the separation of the flow from the airfoil surface.
- Increasing the local airspeed near the trailing edge.
- Controlling the growth of the boundary layer thickness along the airfoil surface

Answer:- Increasing the effective camber of the airfoil.

- Thin airfoil theory predicts that the lift slope is for
- Symmetric airfoils only
- Cambered airfoils only
- Any airfoil shape
- Joukowski airfoils only

Answer:- Symmetric airfoils only

- The ordinary differential equation where
*k*is real and positive- is non-linear
- has a charecteristic equation with one real and one complex root
- has a charecteristic equation with two real roots
- has a complementary function that is simple harmonic

Answer:- has a complementary function that is simple harmonic

- A non-trivial solution to the (n*n) system of equations [A]{x} = {0}. where {0} is the null vector
- can never be found
- may be found only if [A] is not singular
- may be found only if [A] is an orthogonal matrix
- may be found only if [A] has at least one eigenvalue equal to zero

Answer:-

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