MISC

Question 1

A carrier drain coil would be used to:

Answer 1

Increase impedance at the power frequency

Question 2

A term derived from the fact the control action produced by the feature is based on the rate at which the controlled variable changes value.

Answer 2

Rate Response

Question 3

A vlv is used to ___ in a piping system.

Answer 3

Control the flow

Question 4

Analog refers to what type of signal?

Answer 4

Continuous and an infinite # of points between its beginning and end values

Question 5

At what temp does all molecular activity cease?

Answer 5

0 degrees K
-273 degrees R
-460 degrees F

Question 6

Besides temp, what else is used to adjust the set point of flow controllers?

Answer 6

Pressure

Question 7

Describes a control arrangement where one unit of a multi-unit plant may be assigned to control frequency

Answer 7

Flat frequency control

Question 8

direct current is electric current that flows

Answer 8

one direction

Question 9

dry chemical extinguishers consist of a powder composed of

Answer 9

highly refined soda

Question 10

Electric liquid level controllers can be used for?

Answer 10

Low and high alarms
Discrete level indicators
Operate multiple outflow pumps

Question 11

Final control element

Answer 11

Enables the operation to bring about change in the controlled element.

Question 12

for an oxygen breathing apparatus complete respiratory protection is provided for a minimum of

Answer 12

45 minutes

Question 13

for co2 extinguishers the approx. duration of discharge is

Answer 13

20lbs 45 sec

Question 14

how does proportional action work

Answer 14

it positions the valve in proportion to change the controlled variable

Question 15

How is liquid level measured by the hydrostatic method?

Answer 15

for each foot of vertical height a column of water produces a pressure of approx. .433psi. use the formula: P= .433xGxH
G= Specific Gravity
h= height above the metering ground

Question 16

how is ohm meter different from and ammeter and volt meter

Answer 16

it has its own power and axillary control circuit

Question 17

In first using a multirange DC voltmeter on a circuit of UNKNOWN voltage, set the range selector at:

Answer 17

The highest point and work downward until the proper range is determined

Question 18

Is a radio frequency signal modulated by another signal modulated by another signal at an audio frequency rate, and thus carries the intelligence of the second signal.

Answer 18

Carrier current

Question 19

Monometer is a pressure gauge that responds to large pressure changes

Answer 19

b) false

Question 20

Most PLC’s have 5 common building clocks that originated from what type of relay logic in control circuits?

Answer 20

Relay ladder logic

Question 21

Name 2 types of air relays

Answer 21

Continuous bleed
Non-bleed

Question 22

Name 2 types of electrically powered devices that position final control elements?

Answer 22

Solenoid, electric motor operated

Question 23

Name 3 types of mechanical pressure elements

Answer 23

four-wire voltage transmitter
two-wire current transmitter
smart transmitter

Question 24

Name the two scales for measuring specific gravity:

Answer 24

API- American Petroleum Institute
Baume

Question 25

One or more systems operating with metering and control facilities on all of its ties to other systems outside of the control area.

Answer 25

Control area

Question 26

out of the four characteristics which one does not affect the performance of the controlled in the automatic controlled system?

Answer 26

distance

Question 27

Pneumatic controllers for commercial applications usually are of what capability

Answer 27

proportional plus rest plus rate capability

Question 28

power factor measures

Answer 28

the watts over volts ampers

Question 29

Set point:

Answer 29

The desired value of the controlled variable.

Question 30

Structural drawings of a building that can be used as a flow diagram is called a(n) ___ drawing.

Answer 30

Elevation

Question 31

The 2 wire (current transmitter) is the most popular electronic temp transmitter.

Answer 31

TRUE

Question 32

The 4 most common fluids to fill liquid thermometers are?

Answer 32

Mercury Alcohol Toluene Pentane

Question 33

the compensating dashpot serves to prevent over-travel or hunting of the gates by

Answer 33

re-centering the pilot valve

Question 34

The composite symbol shown below includes the symbol for a(n):

Answer 34

Electric motor

Question 35

the control area =

Answer 35

one or more systems operating with metering and control facilities on all its ties to other systems outside the control area

Question 36

the electrical analog output of the tlc is like the transmitters output

Answer 36

2 to 20 milliamp signal

Question 37

The movement the primary element must move before the controlled element starts to move. Where no output action occurs

Answer 37

Dead zone or dead band

Question 38

The process of determining the quantity of fluid that passes a particular point in a given interval of time:

Answer 38

Flow measurement

Question 39

the process where two systems not directly tied together may exchange electrically energy with each other through a third system to which they are mutually connected

Answer 39

wheel energy

Question 40

The processors memory section has 2 areas, they are:

Answer 40

Program files Data files

Question 41

the speed in which the syncroscope indicator is rotating is affected by

Answer 41

Look up

Question 42

The steel core of ACSR conductors does not:

Answer 42

Carry any appreciable amount of load current

Question 43

The symbol below represents a ___ in a ___ system.

Answer 43

Receiver; pneumatic

Question 44

thyrite would most likely be used with

Answer 44

valve type lightning arresters

Question 45

What are PLC's?

Answer 45

Programmable logic controllers are electronic control devices that perform many logic functions.

Question 46

what are two types of electrical power devices that position final control elements

Answer 46

solenoid and electric motor

Question 47

what controls and maintains the wicket gates as it opens to allow the generator to get up to main speed

Answer 47

gate limit device

Question 48

what controls the amount of water flowing past the point during an interval of time

Answer 48

rate of control

Question 49

What is a back pressure regulator?

Answer 49

Regulating the rate at which find flows downstream controls upstream pressure. The control of upstream pressure is commonly called back pressure control

Question 50

What is lag and what is it caused by?

Answer 50

Time lapse that occurs between the moment a set point change command is sent and when it occurs, caused by primary elements, measuring means, sensors or other items in the system.

Question 51

what is not a usual element filled temperature system

Answer 51

bi metal strip

Question 52

what is not an advantage of hvdc transmission lines

Answer 52

overall insolation requirement may be based on the peak rather than actual voltage

Question 53

what is not Boolean algebra

Answer 53

notit

Question 54

What is used to strengthen a metallic diaphragm unit made from two capsules?

Answer 54

C-spring

Question 55

what powers the flay ball

Answer 55

pmg - permeant magnet generator

Question 56

when using an ohm meter short the leads together and set the meter to read ___ while adjusting the zero adjustment knob.

Answer 56

zero ohms

Question 57

Which of the symbols below represents a pushbutton?

Answer 57

*A square with a filled in circle in the middle

Question 58

which three is a mode of controlling

Answer 58

on/off proportional plus reset, proportional plus reset plus rate

Question 59

Why do we have to measure and control?

Answer 59

So that we may control the quality and quantity of a product

Question 60

Why use a nozzle and flapper on a controller

Answer 60

A small force is required to position that flapper and produce a full range of pressure valves for control