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In-Class Sessions > MISC > Flashcards

MISC Flashcards

1
Q

A carrier drain coil would be used to:

A

Increase impedance at the power frequency

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2
Q

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.

A

Rate Response

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3
Q

A vlv is used to ___ in a piping system.

A

Control the flow

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4
Q

Analog refers to what type of signal?

A

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

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5
Q

At what temp does all molecular activity cease?

A

0 degrees K
-273 degrees R
-460 degrees F

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6
Q

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

A

Pressure

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7
Q

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

A

Flat frequency control

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8
Q

direct current is electric current that flows

A

one direction

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9
Q

dry chemical extinguishers consist of a powder composed of

A

highly refined soda

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10
Q

Electric liquid level controllers can be used for?

A

Low and high alarms
Discrete level indicators
Operate multiple outflow pumps

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11
Q

Final control element

A

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

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12
Q

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

A

45 minutes

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13
Q

for co2 extinguishers the approx. duration of discharge is

A

20lbs 45 sec

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14
Q

how does proportional action work

A

it positions the valve in proportion to change the controlled variable

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15
Q

How is liquid level measured by the hydrostatic method?

A

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

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16
Q

how is ohm meter different from and ammeter and volt meter

A

it has its own power and axillary control circuit

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17
Q

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

A

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

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18
Q

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.

A

Carrier current

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19
Q

Monometer is a pressure gauge that responds to large pressure changes

A

b) false

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20
Q

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

A

Relay ladder logic

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21
Q

Name 2 types of air relays

A

Continuous bleed
Non-bleed

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22
Q

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

A

Solenoid, electric motor operated

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23
Q

Name 3 types of mechanical pressure elements

A

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

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24
Q

Name the two scales for measuring specific gravity:

A

API- American Petroleum Institute
Baume

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25
Q

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

A

Control area

26
Q

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

A

distance

27
Q

Pneumatic controllers for commercial applications usually are of what capability

A

proportional plus rest plus rate capability

28
Q

power factor measures

A

the watts over volts ampers

29
Q

Set point:

A

The desired value of the controlled variable.

30
Q

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

A

Elevation

31
Q

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

A

TRUE

32
Q

The 4 most common fluids to fill liquid thermometers are?

A

Mercury
Alcohol
Toluene
Pentane

33
Q

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

A

re-centering the pilot valve

34
Q

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

A

Electric motor

35
Q

the control area =

A

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

36
Q

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

A

2 to 20 milliamp signal

37
Q

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

A

Dead zone or dead band

38
Q

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

A

Flow measurement

39
Q

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

A

wheel energy

40
Q

The processors memory section has 2 areas, they are:

A

Program files
Data files

41
Q

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

A

Look up

42
Q

The steel core of ACSR conductors does not:

A

Carry any appreciable amount of load current

43
Q

The symbol below represents a ___ in a ___ system.

A

Receiver; pneumatic

44
Q

thyrite would most likely be used with

A

valve type lightning arresters

45
Q

What are PLC’s?

A

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

46
Q

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

A

solenoid and electric motor

47
Q

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

A

gate limit device

48
Q

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

A

rate of control

49
Q

What is a back pressure regulator?

A

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

50
Q

What is lag and what is it caused by?

A

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.

51
Q

what is not a usual element filled temperature system

A

bi metal strip

52
Q

what is not an advantage of hvdc transmission lines

A

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

53
Q

what is not Boolean algebra

A

notit

54
Q

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

A

C-spring

55
Q

what powers the flay ball

A

pmg - permeant magnet generator

56
Q

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

A

zero ohms

57
Q

Which of the symbols below represents a pushbutton?

A

*A square with a filled in circle in the middle

58
Q

which three is a mode of controlling

A

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

59
Q

Why do we have to measure and control?

A

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

60
Q

Why use a nozzle and flapper on a controller

A

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

In-Class Sessions (31 decks)

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