Question: A PI controller is to be used in a temperature control system for a bioreactor. For nominal conditions, it has been determined that the closed-loop

A PI controller is to be used in a temperature control system for a bioreactor. For nominal conditions, it has been determined that the closed-loop system is stable when τ1 = 10 min and – 10 < Kc < 0. Would you expect these stability limits to change for any of the following instrumentation changes? Justify your answers using qualitative arguments.
(a) The span on the temperature transmitter is reduced from 40 to 20 °C.
(b) The zero on the temperature transmitter is increased from 10 to 30 °C.
(c) The control valve “trim” is changed from linear to equal percentage.

Step by Step Solution

★★★★★

3.48 Rating (151 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

The stability limits are obtained from the characteristic Eq 1... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

38-E-C-E-P-C (166).docx

120 KBs Word File

Students Have Also Explored These Related Chemical Engineering Questions!

For a steel alloy it has been determined that a carburizing heat treatment of 10-h duration will raise the carbon concentration to 0.45 wt% at a point 2.5 mm from the surface. Estimate the time...

The galvanometer in Exercise 40 is to be used in a voltmeter with a full-scale reading of 15 V. (a) Should you use (1) a shunt resistor, (2) a zero resistor, or (3) a multiplier resistor? Why? (b)...

A CE transistor is to be used in the amplifier of Fig. 3.72 with a source resistance R S and collector resistor R C . First, find the overall small-signal gain v o /v i as a function of R S , R C ,...

Equation 11.14 can be expressed in "coordinate-free" form by writing P0 cos = P0 r. Do so, and likewise for Eqs. 11.17, 11.18. 11.19, and 11.21.

Prat Corp. started the 2018 accounting period with $30,000 of assets (all cash), $12,000 of liabilities, and $13,000 of common stock. During the year, the Retained Earnings account increased by...

The following incomplete T-accounts were drawn from the records of Richland Manufacturing Company: Required Determine the dollar amounts for (a), (b), (c), (d), and (e). Assume that under applied and...

=+Makers of a new frozen entre arranged for it to be served to randomly selected customers at a restaurant in place of the equivalent entre ordinarily prepared in the kitchen. After their meal, the...

The Simple Simon Bakery produces fruit pies for freezing and subsequent sale. The bakery, which operates 5 days per week, 52 weeks per year, can produce pies at the rate of 64 pies per day. The...

Wyalusing Industries has manufactured prefabricated houses for over 20 years. The houses are constructed in sections to be assembled on customers' lots. Wyalusing expanded into the precut housing...

Michelle owns appreciated property and she wants to use this property to start a business with her son, Lance. Michelle is considering making a contribution of the property to a newly organized...

Rebek Corporation provides the following information about its defined benefit pension plan for the year 2011: Service cost ....................... $ 225,000 Contribution to the plan...

The Signature Assignment Project is an integrative project focusing the application of the concepts/ideas from the course. you are to engage in an original integrative project presenting their...

Loyalty Program Comparison Chart Directions: Use your research to complete the comparison chart below. Rank each program as directed. Complete the short answer prompts to analyze your findings. Use...

State the functions that a household automatic dishwasher performs during its operation cycle. For each function, indicate the primary medium (signals, data, materials, or energy) involved. Describe...

Shaanxi mining Company (GH) Ltd. is a Chinese mining company operating in Ghana. Using relevant examples discuss four (4) factors that might propel Shaanxi to engage in Corporate Social...

Dying for a Paycheck, Jeffrey Pfeffer. The toll in both excess mortality and health-care costs from harmful workplace practice is exceedingly high in the U.S. Pfeffer demonstrates the severity of the...

11. Let the joint distribution function of the lifetimes of two brands of lightbulb be given by Find the probability that one lightbulb lasts more than twice as long as the other. F(x,y) Answered: 3 weeks ago

In a large midwestern university, 30% of the students live in apartments. If 200 students are randomly selected, find the probability that the number of them living in apartments will be between 55...

When hydrogen gas reacts with iodine gas at elevated temperatures, the following equilibrium is established: A student measured the equilibrium constant as 59.3 at 4008C. If one trial begins with a...

A brake has a normal braking torque of 320 N m and heat-dissipating surfaces whose mass is 18 kg. Suppose a load is brought to rest in 8.3 s from an initial angular speed of 1800 rev/min using the...

A cast-iron flywheel has a rim whose OD is 60 in and whose ID is 56 in. The flywheel weight is to be such that an energy fluctuation of 5000 ft ?lbf will cause the angular speed to vary no more than...

A single-geared blanking press has a stroke of 8 in and a rated capacity of 35 tons. A cam-driven ram is assumed to be capable of delivering the full press load at constant force during the last 15...

General Electric sold jet engines on credit to Air France and invoiced 10 million payable in six months. Currently, the six-month forward exchange rate is $1.25/ and the foreign exchange advisor for...

McCallum Tool Company has two departments, assembly and finishing. The assembly department takes purchased parts and assembles the final product. The finishing department performs testing, adds other...

Parker & Stone, Inc., is looking at setting up a new manufacturing plant in South Park to produce garden tools. The company bought some land six years ago for $5.4 million in anticipation of using it...