List of top Aerospace Engineering Questions asked in TS PGECET

For a thin-walled C-channel, why does a load applied at the centroid produce twisting?

The standard shear flow formula \[ q=\frac{VQ}{I} \] is not applicable to thick-walled sections. The primary reason is

According to Bredt--Batho theory, shear flow in a thin-walled closed section under torsion is

Which structural design philosophy allows the outer skin of an aircraft to carry a significant portion of the load?

A plane truss has \(10\) joints. For it to be a perfect truss, the number of members must be

A symmetrical section subjected to a load inclined to its principal axis will produce

On a principal plane, the relationship between the stress components is such that

According to Rankine's failure theory, failure occurs when

According to Tresca theory, yielding begins when

The sum of normal stresses on any two mutually perpendicular planes is

What is the angle between the principal plane and the plane of maximum in-plane shear stress?

An element is subjected to a pure shear stress of magnitude \(\tau\). Which of the following statement is incorrect regarding the Mohr's Circle for this stress state?

In Rayleigh flow, what happens to the stagnation pressure when heat is added, regardless of whether the flow is subsonic or supersonic?

A steel bar is held between two rigid fixed supports. If the temperature of the bar is increased by \(100^\circ\text{C}\), what is the magnitude of the thermal stress induced in the bar? (Coefficient of thermal expansion is \(11\times10^{-6}/^\circ\text{C}\) and Young's modulus of elasticity is \(210\ \text{GPa}\))

A cylindrical alloy rod is subjected to a tensile force such that its length increases by \(4\%\) from its original length. During this deformation, the diameter of the rod is observed to decrease by \(1\%\). What is the Poisson's ratio of the alloy?

A point in a structural member is subjected to a plane stress state where \(\sigma_x=80\ \text{MPa}\), \(\sigma_y=20\ \text{MPa}\), and \(\tau_{xy}=40\ \text{MPa}\). What is the maximum principal stress?

Air \((\gamma=1.4)\) flows isentropically through a convergent-divergent nozzle. At a certain section, the Mach number is \(1.0\) (at the throat). If the stagnation temperature is \(720\ \text{K}\), find the static temperature at the throat.

During a rocket launch from Sea Level to Space, a fixed-geometry nozzle that is over-expanded at the launch pad will eventually become

In a diffuser, the primary purpose is to

In a subsonic jet engine, what is the primary thermodynamic purpose of the diffuser located after the compressor?

Fanno flow is characterized by

If a supersonic flow (\(M=2.0\)) encounters a convex corner (expansion), what happens to the stagnation pressure?

If the critical speed of sound is \(300\ \text{m/s}\), upstream velocity across the normal shock wave is \(600\ \text{m/s}\), the downstream velocity is

The aerodynamic centre of an aerofoil is defined as the point

A horse-shoe vortex is primarily associated with