A proportional controller is used to control the temperature of an autoclave from \(60^{\circ}C\) to \(130^{\circ}C\). If the proportional band setting of the controller is 25%, the proportional gain value is ______________.
Show Hint
Proportional Band (PB) indicates the range of error over which the controller output varies from 0% to 100%.
Proportional Gain (\(K_p\)) is the inverse of PB (in fraction form). Smaller PB \(\Rightarrow\) larger gain.
Typical relation: \(K_p = 100/PB(%)\).
Correct Answer: 4
Solution and Explanation
Top Questions on Bioprocessing
- In downstream processing, chromatography is primarily used for:
- AP PGECET - 2025
- Biotechnology
- Bioprocessing
- The term "washout" in continuous culture refers to:
- AP PGECET - 2025
- Biotechnology
- Bioprocessing
E. coli cultivated at 298 K uptakes an uncharged compound (A) by passive diffusion. The intracellular and extracellular concentrations of A are 0.001 M and 0.1 M, respectively. If \(R=1.9872\ \mathrm{cal\ mol^{-1}\ K^{-1}}\), the free-energy change (in \(\mathrm{kcal\ mol^{-1}}\)) for this passive diffusion of A (rounded off to two decimal places) is ________________.
- GATE BT - 2023
- Biotechnology
- Bioprocessing
E. coli is cultivated in a chemostat operated at a dilution rate of 0.2 h\(^{-1}\). The values of biomass yield due to oxygen consumption and the steady state biomass concentration are 0.2 g g\(^{-1}\) and 10 g L\(^{-1}\), respectively. The oxygen transfer rate (in g L\(^{-1}\) h\(^{-1}\)) is ____________.
- GATE BT - 2023
- Biotechnology
- Bioprocessing
- An evaporator is insulated using glass wool material of \(0.15\ \text{m}\) thickness. The inner most surface and the outer surface of the insulation are at \(700^{\circ}\text{C}\) and \(80^{\circ}\text{C}\), respectively. The mean thermal conductivity of the glass wool under these conditions is \(0.29\ \text{W}\,\text{m}^{-1}\,\text{K}^{-1}\). The rate of heat loss (in W) through \(1.2\ \text{m}^2\) of the evaporator wall surface (rounded off to the nearest integer) is ________________.
- GATE BT - 2023
- Biotechnology
- Bioprocessing
Questions Asked in GATE BT exam
- Rohit goes to a restaurant for lunch at about 1 PM. When he enters the restaurant, he notices that the hour and minute hands on the wall clock are exactly coinciding. After about an hour, when he leaves the restaurant, he notices that the clock hands are again exactly coinciding. How much time (in minutes) did Rohit spend at the restaurant?
- The sum of the following infinite series is: \[ 1 + \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \frac{1}{4!} + \frac{1}{5!} + \dots \]
- GATE CH - 2025
- GATE BT - 2025
- GATE GG - 2025
- Sequence and Series
- A thin wire is used to construct all the edges of a cube of 1 m side by bending, cutting, and soldering the wire. If the wire is 12 m long, what is the minimum number of cuts required to construct the wire frame to form the cube?
A color model is shown in the figure with color codes: Yellow (Y), Magenta (M), Cyan (Cy), Red (R), Blue (Bl), Green (G), and Black (K). Which one of the following options displays the color codes that are consistent with the color model?
- If the function
\[ f(x) = \begin{cases} \sin(2x), & \text{for } x > 0, \\ a + bx, & \text{for } x \leq 0, \end{cases} \]
where \( a \) and \( b \) are constants, is differentiable at \( x = 0 \), then \( a + b \) is equal to:- GATE BT - 2025
- Continuity and differentiability