F11_ECH157_Quiz1

F11_ECH157_Quiz1 - with a feed flow rate F s =0.1 m 3 /min,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
University of California, Davis Department of Chemical Engineering & Materials Science ECH 157 – Process Dynamics and Control Fall 2011 – Quiz # 1 Instructions : This is a 30-minute closed-book quiz. Please print your name on all answer sheets, label the problems clearly and put them in the right order. Read all questions carefully; answer them concisely and neatly. Point values for each problem are based on 10 points total for the quiz. Good Luck ! Problem 1 (4 points) : Consider the reactor-separator process depicted in the figure below. Identify two different control loops from the process diagram. For each control loop, specify the measured variable, the controlled variable and the manipulated variable. Also, indicate if the chosen control loop is a feedback or a feed-forward control loop. Justify your answer!
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Problem 2 (6 points) : The continuous stirred tank reactor (CSTR) shown in the figure below has been operating for a long time
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: with a feed flow rate F s =0.1 m 3 /min, a feed concentration C A0s =1.0 kg-mol/m 3 and reactant concentration C As =0.382 kg-mol/ m 3 . The feed flow rate experiences a step increase to 0.2m 3 /min , while all other process parameters remain constant. Answer the following questions: 1. What are the time constant and the steady state gain of the process K (include the units)? 2. Determine the dynamic response of the process (i.e., how the reactant concentration responds to the step change in the feed flow rate). Data and assumptions : 1. The reaction rate law is given by: -r A = k C A 0.5 Where the rate constant Is k = 1.0 kg-mol 0.5 /m 1.5 .s. 2. The reactor is maintained at a constant temperature (T=300 K) and is well-mixed. 3. The mass density of the reaction mixture ( =1000 kg/m 3 ) and the reactor volume (V=0.1 m 3 ) are constant....
View Full Document

This note was uploaded on 01/28/2012 for the course ECH 157 taught by Professor Palagozu during the Fall '08 term at UC Davis.

Page1 / 2

F11_ECH157_Quiz1 - with a feed flow rate F s =0.1 m 3 /min,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online