Register

Homework Help Question and Answers

Submit a new Query

Recent Homework Help Question & Answers


Question 40483

posted 1 years ago

Two liquid storage tanks are shown in Figure Q2. For System I, the valve acts with a resistance R = 580 s m-2, so that the relation between the flow (F)and liquid level in the tank (h) is given by F = hlR. For System II, a pump is used instead of the valve, meaning that variations in liquid level do not affect the exit flow rate. The diameter of each tank is the same, D = 1.1 m. For each system determine the following information and show all your workings:
(a) Process gain (Kp) and time constant (7).
(b) New steady-state liquid levels in both System I and System II, if the inlet flow rate suddenly changes from 3.0x10-3 m³ s-1 to4.5x10-3 m3 s-1. The initial steady-state level in both systems is 1.8 m.
(c) If each tank is 2.4 m tall, which tank overflows first? Calculate when this will happen.

View answer

Question 40484

posted 1 years ago

A single-tank process has been operating with an inlet flow rate equal to29.4 m3 min-1. The operator increases the flow rate suddenly by 10%,resulting in a level change in the tank as recorded in Table Q3.
Assuming that the liquid-level dynamics follow a first-order model, determine:
(a) The Pl controller settings using the Ziegler-Nichols tuning relations.
(b) The process gain and time constant using Sundaresan and Krishnaswamy's method. Compare these values against the values from the graphical method.

View answer

Question 40485

posted 1 years ago

(a) The control block diagram of a typical feed forward controller is presented in Figure Q4.1.
Derive the closed-loop transfer function between that Y and Ysp(i)(Y/ Ysp), assuming that D = 0.
\text { Show that } \frac{Y}{D}=\frac{G_{d}+G_{v} G_{p} G_{f} G_{t}}{1+G_{v} G_{c} G_{m} G_{p}} \text { when } Y_{\mathrm{sp}}=0
Maple syrup is evaporated to raise the sugar concentration of the syrup,making it suitable for food topping, as shown in Figure Q4.2. As a chemical engineer, you are asked to design a selective control system capable of controlling the level and exit flow rate of the concentrated syrup. Considering this information, answer the following:
(i)Propose control loops by sketching a schematic diagram of theselective control system.(5 marks)
(ii) Explain how the proposed selective control works during normaloperations.
(iii) Discuss how the proposed selector operates when the flow rate of concentrated maple suddenly drops.
(iv) Comment on the advantages of this selective control system in respect to a single loop system.(2 marks)

View answer

Question 40482

posted 1 years ago

In the process presented in Figure Q1, tomato pulp is heated as it passes through a steam heat exchanger and then enters an evaporator where the water boils off. The purpose of this process is to produce tomato paste, which has a lower water content than the pulp. As a chemical engineer, you are tasked to control the liquid level and temperature in the evaporator.Considering this information, answer the following:
(a) Define the process variables and the manipulated variables, as well as possible disturbances.
(b)Propose feedback control loops by sketching a schematic diagram.
(c) Propose any additional features in order to assure the safe operation of the process. Illustrate these features using a schematic diagram.

View answer

Question 33632

posted 1 years ago

d. (15 points) What spring constant value will result in the system comingto (and remaining within) 1% of its new steady-state position withoutovershooting that value as quickly as possible?
b. (15 points) What is the new steady-state position? That is, where willt - o ? Show this using the final-value theorem.the mass settle as
O What are the initial conditions for this system?
2. (65 points) Imagine the spring is vertical. The weight is held by a platform atx=0 initially. If m=0.1kg , b=0.1 kg/ s , and k=1.0 kg/s . The platformis removed at t=0
c. (15 points) What is the maximum distance the mass will move from itsinitial position? (Hint: what is the force applied to the weight?)(15 peints) Whatvalue vwill recuultming
m \frac{d^{2} x}{d t^{2}}+b \frac{d x}{d t}+k x=f(t)
f(t) . This leads to the ODE
Consider a weight held in place by a spring. Initially suspended at rest, the height ofThe spring constant is kThis represents how "stiff" the spring is and is constant. The frictional losses areisthe weight is x=0The mass of the weight ismcharacterized by the constant b . The force applied to the weight after t=0
e. (15 points) Imagine the spring system is now horizontal.represents how far the spring is from its resting position. If 1 N of forceis instantaneously transferred to the weight (in thedirection)described above att=0 ,what is the response? That is, what isx(t) when the weight is flicked with 1 N of force? Assume the weightis only free to move in one direction.

View answer

Question 33633

posted 1 years ago

3. (15 points) Prove that a second-order system that results from two first-ordersystems in series can never be underdamped.

View answer

Question 33631

posted 1 years ago

Complete the following quiz using only materials distributed in this class. You mayuse any material in the class Google Drive and your textbook, but no othermaterials or people. You must do your work on your own. Enter your answers intothis document and convert it to a PDF prior to submission on eCampus. If your workinvolves long, handwritten solutions then you may attach those as an image eitherin this document or as a separate document. Final answers, however, MUST be inthis document.
following figure?
1. (20 points) What is the input function and the Laplace transform of the

View answer

Questions not Found

Most popular subject

Thermodynamics

Essay/Summary

Mechanics

Complex Analysis

Engineering Economics

Calculus

Modern Physics

General Chemistry

Strength Of Materials

Fluid Mechanics

x