A negative gain margin expressed in decibels means a/an _____ system
Show Hint
- Stable
- Critically damped
- Unstable
- Over damped
The Correct Option is C
Solution and Explanation
This causes oscillations and eventual instability.
Top Questions on Process Control
Consider a process with transfer function: \[ G_p = \frac{2e^{-s}}{(5s + 1)^2} \] A first-order plus dead time (FOPDT) model is to be fitted to the unit step process reaction curve (PRC) by applying the maximum slope method. Let \( \tau_m \) and \( \theta_m \) denote the time constant and dead time, respectively, of the fitted FOPDT model. The value of \( \frac{\tau_m}{\theta_m} \) is __________ (rounded off to 2 decimal places).
Given: For \( G = \frac{1}{(\tau s + 1)^2} \), the unit step output response is: \[ y(t) = 1 - \left(1 + \frac{t}{\tau}\right)e^{-t/\tau} \] The first and second derivatives of \( y(t) \) are: \[ \frac{dy(t)}{dt} = \frac{t}{\tau^2} e^{-t/\tau} \] \[ \frac{d^2y(t)}{dt^2} = \frac{1}{\tau^2} \left(1 - \frac{t}{\tau}\right) e^{-t/\tau} \]- The block diagram of a series cascade control system (with time in minutes) is shown in the figure. For \( \tau_1 = 8 \) min and \( K_s^c = 1 \), the maximum value of \( K_m^c \), below which the cascade control system is stable, is \_\_\_\_ (rounded off to the nearest integer).
\includegraphics[width=0.5\linewidth]{62.png} - Transfer function of transportation lag is
- TS PGECET - 2024
- Chemical Engineering
- Process Control
- The closed loop pole of a stable second order system could be
- TS PGECET - 2024
- Chemical Engineering
- Process Control
- What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?
- TS PGECET - 2024
- Chemical Engineering
- Process Control
Questions Asked in TS PGECET exam
- Melting rates of electrodes in manual metal arc welding process is mainly governed by the
- TS PGECET - 2024
- Manufacturing Processes
- The maximum area of a rectangle that can be inscribed in a circle of radius $R$ is
- TS PGECET - 2024
- 3D Geometry
- For the matrix \[ \begin{bmatrix} 2 & 1 & 1 \\ 0 & 2 & 1 \\ 1 & 0 & 1 \end{bmatrix}, \] an Eigen vector among the following vectors is
- TS PGECET - 2024
- Linear Algebra
- Which of the following expression is a tautology?
- TS PGECET - 2024
- Digital Logic
- The 2’s complement representation of the decimal value $-15$ is
- TS PGECET - 2024
- Digital Logic
