List of top Aerospace Engineering Questions asked in TS PGECET

An aircraft is gliding at an altitude of \(3000\) metres with the engine failed. The aircraft has a maximum Lift-to-Drag ratio \((L/D)_{\max}\) of \(15\). Calculate the maximum horizontal distance the aircraft can cover before hitting the ground.

A vertical rocket has mass \(10,000\ \text{kg}\), thrust \(150,000\ \text{N}\) and drag \(20,000\ \text{N}\). The instantaneous acceleration (in \(\text{m/s}^2\)) is

A rocket stage that ignites after the previous stage is jettisoned is called

A rocket produces maximum thrust in vacuum because

Which of the following increases the thrust of a rocket engine?

Drag loss in a rocket flight is

Gravity loss during rocket flight occurs because

Liquid chemical rockets are often classified by the type of propellants used. Which of the following is correct?

Specific impulse of a rocket engine is defined as

In multi-stage rockets, the stage mass fraction is defined as

One major advantage of liquid propellant rockets over solid propellant rockets is

For maximum thrust in a rocket nozzle, the exit pressure should be

In a solid propellant rocket, the thrust level is primarily controlled by

The work done per unit mass in a centrifugal compressor mainly depends on

Compressor surge occurs when

A centrifugal compressor has an impeller tip speed of \(200\ \text{m/s}\). The whirl component of absolute velocity at the impeller exit is \(150\ \text{m/s}\). The whirl component of velocity at the inlet is zero. The specific heat at constant pressure is \(1\ \text{kJ/kg K}\). Using Euler's compressor principle, determine the temperature rise across the impeller.

Slip factor in a centrifugal compressor accounts for

The primary function of the inducer in a centrifugal compressor is to

In an impulse turbine stage (degree of reaction \(=0\))

The degree of reaction in an axial compressor stage is

For an axial turbine stage, the work done per unit mass flow is directly proportional to

An axial turbine stage has a degree of reaction of \(50\%\) and operates with symmetrical velocity triangles (i.e., absolute inlet and exit flow angles are equal in magnitude but opposite in direction). The axial velocity remains constant through the stage. Which of the following statements is correct?

Stage efficiency of a single-stage axial compressor is defined as

A convergent-divergent nozzle is used in jet engines to

The main thermodynamic cycle used in a turbojet engine is