List of top Questions asked in TS PGECET

The matrix \[ A= \begin{bmatrix} 1 & 1+i & 2i 1-i & 3 & 4 -2i & 4 & 5 \end{bmatrix} \] has

Fourier series of \(x^2,\;0<x<2\) is \[ f(x)=\frac{a_0}{2} +\sum_{n=1}^{\infty}a_n\cos(n\pi x) +\sum_{n=1}^{\infty}b_n\sin(n\pi x), \] then \(b_2=\)

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

Gravity loss during rocket flight occurs because

A convergent series from the given series is

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

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

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

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

Drag loss in a rocket flight is

A rocket produces maximum thrust in vacuum because

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

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

Compressor surge occurs when

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

Specific impulse of a rocket engine is defined as

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

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

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

Slip factor in a centrifugal compressor accounts for

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.

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

The degree of reaction in an axial compressor stage is

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