List of top Chemical, Thermal and Polymer Engineering Questions

Which law is used to describe steady-state diffusion in gases?

The Block diagram for a control system is shown below: 

Bag I contains 4 red and 3 green balls and Bag II contains 3 blue and 4 green balls. One ball is drawn at random from each bag, then the probability that one of the drawn balls is red and the other is blue, is:
A pipe with diameter 25 cm at the entrance carries oil with specific gravity 0.9 at a velocity of 3 m/s. At the exit section the diameter of the pipe is 20 cm. The velocity at the exit section is:
A first-order system with unity gain and time constant \( \tau \) is subjected to sinusoidal input having a frequency \( \omega \) of \( \frac{1}{\tau} \). The amplitude ratio for such system is:
The transfer function of a PID controller is:
A rigid spherical particle is undergoing free settling in a liquid of density 750 \( \text{kg/m}^3 \), viscosity \( 9.81 \times 10^{-3} \, \text{Pa.s} \). Particle density is four times the liquid density. Taking the acceleration due to gravity as \( 9.81 \, \text{m/s}^2 \) and assuming Stokes' law is valid, the terminal settling velocity of the particle in \( \text{ms}^{-1} \) is:
In an internal combustion engine, during the compression strokes, the heat rejected to the cooling water is 75 J/g and the work input is 120 J/g. The change in internal energy of the working fluid is:
If the temperature of a saturated water is increased infinitesimally at constant entropy, the resulting state of water is:
Match the LIST-I with LIST-II:\[\begin{array}{|c|c|} \hline \textbf{LIST-I} & \textbf{LIST-II} \\ \hline \text{A. Gauss Seidel method} & \text{I. Interpolation} \\ \hline \text{B. Forward Newton method} & \text{II. Non-linear Differential equation} \\ \hline \text{C. Runge Kutta method} & \text{III. Numerical Integration} \\ \hline \text{D. Trapezoidal rule} & \text{IV. Linear algebraic equations} \\ \hline \end{array}\] Choose the correct answer from the options given below:
Sulfa drugs are derivatives of:
A step change of magnitude is introduced to a system having the transfer function \[ G(s) = \frac{2}{s^2 + 2s + 4} \] The percent overshoot is:
The characteristic equation for the system is \[ s^3 + 9s^2 + 26s + 12(2 + K_c) = 0 \] Using Routh test, the value of Kc that will keep the system stable is:
The unit step response of the transfer function \( G(s) = \frac{1}{s^2 + 2s + 3} \) has:
As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches:
Bode diagram is a plot of (AR is amplitude ratio; $\omega$ is frequency factor and $\phi$ is phase angle):
Consider a piston-cylinder arrangement containing a gas. This system is heated by placing it on the top of a burner. The system undergoes:
In the laminar boundary layer over a flat plate, the ratio of \( \delta/x \) varies as \( Re^k \) (Where, \( Re \) is Reynolds number). The value of \( k \) is:
A gaseous system contains \( H_1 \), \( H_2 \), and \( I_2 \) which participate in the gas phase reaction: \[ 2H_1 \rightleftharpoons H_2 + I_2 \] At a state of reaction equilibrium, the number of thermodynamic degrees of freedom is:
The liquid used in hydraulic transmission is:
The Bode diagram stability criterion is applicable when:
Compared to saturated oils, unsaturated oils have:
For a pure substance, which of the following does not change during condensation?
For a pure substance, the Maxwell's relation obtained from the fundamental property relation \( dU = T dS - P dV \) is:
From the following list, identify the properties which are equal in both vapor and liquid phases at equilibrium:
(A) Temperature
(B) Density
(C) Enthalpy
(D) Chemical potential
Choose the \textbf{correct} answer from the options given below: