Test 4 Study Guide

Front 1

A double acting cylinder type actuator requires ________ positioners

Back 1

double acting

Front 2

Is the last active device in the instrument loop

Back 2

final control element

Front 3

Is designed to ratio (or proportion) the rate of flow between two separate flows entering a mixing point

Back 3

ratio control loop

Front 4

The output of a controller may be divided between 2

Back 4

final control elements

Front 5

A controller not located in the processing area with the transmitter and control valve is considered to be

Back 5

remote

Front 6

a controller physically mounted in the processing area near the other instruments is considered to be

Back 6

local

Front 7

What are the two important reasons for using a cascade lop

Back 7

better control and reduced lag time

Front 8

Is characterized to by the output of one controller becoming the remote setpoint of another

Back 8

cascade control loop

Front 9

are used to control fluid pumping rates

Back 9

variable speed motors

Front 10

the most common final control element in the processing industry

Back 10

control valve

Front 11

The device that directly controls the manipulated variable is

Back 11

the final control element

Front 12

Is achieved if the controller mode is changed from manual to automatic, or vice versa, without the controller generating a change in output

Back 12

Bumpless transfer

Front 13

Are usually placed in manual mode during start-up of the process or whne process problems are encountered

Back 13

controllers

Front 14

A device that provides motion to a valve for controlling purposes is called an

Back 14

actuator

Front 15

Equipment bordered and filled with crosshatched lines on a _______ indicate abandonment in place or dismantlement

Back 15

P&ID

Front 16

Clouds on a P&ID represent

Back 16

revision or addition

Front 17

ISA standa for

Back 17

Instrumentation Systems Automation Society

Front 18

The part of the drawing that contains a compilation of symbols used, as wells as any codes or other notes is called a

Back 18

legend

Front 19

The ______ contain the most detail to include instrumentation and the entire primary control system

Back 19

P&ID drawings

Front 20

The PFD diagrams provide ______ and ______ ______ of the chemical process

Back 20

heat and material balances

Front 21

The most common types of drawings used by process technicians in their daily activities are

Back 21

BFD's , P&ID's, and PFD's

Front 22

A ________ can be used to mix 2 separate flowing streams together into one pipe

Back 22

three-way valve

Front 23

is opened with a rotary motion

Back 23

three-way valve

Front 24

The most common control valve body style in the processing industry is the

Back 24

globe

Front 25

The output signal from a controller can be reversed by the

Back 25

valve positioner

Front 26

What are the three pressure gauges on a pneumatic valve positioner

Back 26

signal, output, and supply

Front 27

What positions the valve stem in reference to the instrument signal

Back 27

a valve positoner

Front 28

Is a device that reacts to an instrument signal by creating linear or rotatinoal motion

Back 28

An actuator

Front 29

During a power failure, you want a valve that is allowing the addition of material to a tank to stop the flow, therefore this valve should be a

Back 29

fail-closed valve

Front 30

A device used to regulate and/or control the pressure of a process fluid upstream of the device location is called a

Back 30

backpressure regulator

Front 31

Two major subcategories of pneumatically driven actuators are the _______________ and the _______

Back 31

piston type actuator; and the spring diaphragm actuator

Front 32

The act of changing the controller from manual to automatic (or vice versa) without a significant change in controller ouput is called a

Back 32

bumpless transfer

Front 33

A switch that allows a process technician to select either automatic or manual control from the front of a controller is called an

Back 33

auto/manual switch

Front 34

A ____________ is where the control loop is characterized by the output of one controller becoming the setpoint of another

Back 34

cascade control loop

Front 35

An instrument that receives a signal from the transmitter and compares it to a setpoint, and produces an output to a final control element is called a

Back 35

controller

Front 36

The control action or control algorithm response such as PID or a programmed function is called the

Back 36

control mode

Front 37

The pushing rod that transfers the motion of the actuator to the valve plug is called the

Back 37

stem

Front 38

A self-contained and self-actuating controlling device used to regulate variables such as pressure, flow, level, and temperature in a process is called

Back 38

regulator

Front 39

The housing component of a valve is called the

Back 39

body

Front 40

A process upset occuring when a contorller is switched from auto to manual mode is called a

Back 40

bump