Page 61 - Modern Control Systems

Skills Check 35

CHECK
In this section, we provide three sets of problems to test your knowledge: True or False, Multiple
Choice, and Word Match. To obtain direct feedback, check your answers with the answer key
provided at the conclusion of the end-of-chapter problems.
In the following True or False and Multiple Choice problems, circle the correct answer.
1. The flyball governor is generally agreed to be the first automatic
feedback controller used in an industrial process. True or False
2. A closed-loop control system uses a measurement of the output and
feedback of the signal to compare it with the desired input. True or False
3. Engineering synthesis and engineering analysis are the same. True or False
4. The block diagram in Figure 1.31 is an example of a closed-loop
feedback system. True or False

Control
—•Actuator—
R(s) —+ . . — • Actuator — • Process s —•>'(*)
•
Proces
devic
e
device
FIGURE 1.31 System with control device,
actuator, and process.
5. A multivariate system is a system with more than one input and/or
more than one output. True or False
6. Early applications of feedback control include which of the following?
a. Water clock of Ktesibios
b. Watt's flyball governor
c. Drebbel's temperature regulator
d. All of the above
7. Important modern applications of control systems include which of the following?
a. Fuel-efficient and safe automobiles
b. Autonomous robots
c. Automated manufacturing
d. All of the above
8. Complete the following sentence:
Control of an industrial process by automatic rather than manual means is often called

a. negative feedback
b. automation
c a design gap
d. a specification
9. Complete the following sentence:
are intrinsic in the progression from an initial concept to the final product.
a. Closed-loop feedback systems
b. Flyball governors
c. Design gaps
d. Open-loop control systems