List of top Questions asked in TS PGECET- 2026

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

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

According to Rankine's failure theory, failure occurs when

According to Tresca theory, yielding begins when

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

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?

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?

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

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?

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

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

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

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 \(210\ \text{GPa}\))

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.

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

In a diffuser, the primary purpose is to

An aircraft is flying at an altitude where the ambient pressure is \(0.9\ \text{kPa}\) and the density is \(1226\ \text{kg/m}^3\). Calculate the velocity of sound when adiabatic index is \(1.226\).

Fanno flow is characterized by

Find the isentropic compressibility of an ideal gas with an adiabatic index of \(1.4\) at a pressure of \(1\) atm.

If an aircraft is flying at its Drag Divergence Mach Number and the pilot increases speed slightly, what happens to the fuel consumption?

The aerodynamic centre of an aerofoil is defined as the point

A horse-shoe vortex is primarily associated with

Critical Mach number of the airfoil is

Primary purpose of trim tab is to