Chapter 4

Question 1

The voltage on the emitter of a UJT just before it fires is called

Answer 1

Peak voltage

Question 2

The ______ is primarily used to turn on the triac

Answer 2

Diac

Question 3

If the voltage applied to an inverting op amp is 3 volts, the feedback resistor is 20k ohms and R in is 10k ohms the output is

Answer 3

-6

Question 4

The output of the measurement device is the

Answer 4

Feedback signal

Question 5

Which elements and signals of a control system do not exist in an open-loop configuration

Answer 5

All the above

Question 6

The ________ is the difference between the condition of the controlled variable and the set point

Answer 6

Error signal

Question 7

The final control element is positioned by a signal from the

Answer 7

Controller

Question 8

________ is the elapsed time between the instant a deviation of the controlled variable occurs, and the corrective action begins

Answer 8

Dead time

Question 9

The set point typically remains unchanged in a ________ control system

Answer 9

Process

Question 10

A ________ is an example of an unintentional factor that causes the condition of the controlled variable to become different from the set point

Answer 10

Disturbance

Question 11

What are the four control modes used by the controller section

Answer 11

Bang bang, PID, PIC, Proportional

Question 12

If +2 volts is applied to the inverting input of an op amp comparator, and -2 volts is applied to the non-inverting input, the output will be at a _______ volt saturation

Answer 12

Negative

Question 13

The triac is capable of handling more current than the SCR T/F

Answer 13

False

Question 14

In a typical process control system, the set point is constantly changing T/F

Answer 14

False