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inst test2
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  • 問題数 100 • 11/26/2023

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    問題一覧

  • 1

    For a 180- degree tubing bend the zero on the forming wheel of the bender must be aligned with what number on the slide block at the beginning of the bend

    180

  • 2

    The most frequent control mode is

    Automatic

  • 3

    Oil based pipe joint compound should never be used on threads of pipe used to Coney oxygen because

    in contact could explode

  • 4

    A 4 wire 100 ohm PT RTD is being checked at 32 F what resistance should be expected between the red and white wire

    100 ohms

  • 5

    The set point on a controller is a specific valve at which

    A process variable is to be maintained

  • 6

    The nominal size of tubing is determined by its

    OD

  • 7

    Valves are used to control all of the following except

    flow of impurities

  • 8

    Pressure is expressed mathematically as

    P = F /A

  • 9

    In a non linear power supply the dc output voltage is regulated by

    SCR

  • 10

    old packing should be replaced with a new packing which is

    in kind

  • 11

    The accuracy of a type J T/C is being questioned what setting on a multimeter will best troubleshoot the issue

    Millivolts

  • 12

    A reverse acting positioner

    closes a control valve as the signal decreases

  • 13

    substance that is capable of reducing friction heat and wear when applied as a film between two surfaces is

    Lubricant

  • 14

    What does the reset control mode eliminate

    circuit overload

  • 15

    convert 87.6 Celsius to Fahrenheit

    189.58

  • 16

    In reference to PID controllers reset relates to:

    the integral of change in the error signal

  • 17

    One PSI is equal to how many inches of water

    27.73

  • 18

    During pneumatic testing what is used to identify the pressure leak

    Soapy water

  • 19

    What causes the valve stem solenoid vale to move up or down?

    Magnetic field induced by an electrical coil that surrounds the stem

  • 20

    The most common standard set symbols for instrumentation is from

    ISA

  • 21

    Connecting tubing into a junction box requires

    Bulkhead fittings

  • 22

    The final step in commissioning should be

    Recording the documents

  • 23

    Pressure switches are actuated by

    Bellow diaphragms or bourdon tubes

  • 24

    Measurements are always taken from the tubing centerline except for the

    first bend

  • 25

    Loop testing involves simulation of the:

    Zero and span

  • 26

    What device is used to measure flow?

    Venturi Tube

  • 27

    An RTD is used to measure

    Temperature

  • 28

    What does a pneumatic valve positioner do

    controls the operation of a valve actuator

  • 29

    RTD elements are normally constructed of

    Platinum copper or nickel

  • 30

    When selecting a regulator, choose the:

    Overpressure protection that protects the regulator

  • 31

    troubleshooting starts with

    verifying that a problem exists

  • 32

    For a 45 degree tubing bend the bend mark must be aligned with what mark on the slide block at the beginning of the bend

    O

  • 33

    Thread compound which is normally applied using a brush is called

    Pipe dope

  • 34

    When inspecting a regulator controlled nitrogen pad system on a large storage tank and no pressure is found what critical item besides the regulator should be checked

    Supply pressure

  • 35

    Water in an air system causes all of the following except

    Pressure fluctuations in process

  • 36

    The range of the transmitter is the

    Difference between upper and lower limits

  • 37

    27.7 inches of H20 is equivalent to

    1 psi

  • 38

    When deburring tubing which of the following should be avoided

    Tapering the internal diameter

  • 39

    nuclear level detectors are used when

    traditional level sensors present a risk to life or the environment

  • 40

    The process parameter that is selected for control is the

    Controlled variable

  • 41

    A disadvantage of direct operated regulators is

    their poor sensitivity

  • 42

    The primary goal for any closed loop control system is

    Stability

  • 43

    Gaskets are usually specified for particular range of

    Temperature and pressure

  • 44

    What information does a P&ID provide

    Shows instrument locations as it relates to the process

  • 45

    What can happen if an instrument is getting too much EMI noise

    It can lead to instrument inaccuracy

  • 46

    When replacing a control valve in kind what is least important

    Location of signal ports

  • 47

    Smart instrument transmission required which of the following for calibration and configuration

    Communicator

  • 48

    In proving and calibrating a loop, equipment is required to:

    Receive an output signals

  • 49

    Where should a dp flow transmitter high pressure side be connected to the orphis taps

    upstream

  • 50

    A worker knows the tag number of an instrument and needs to identify the drawing and documents relating to the particular instrument which of the following would be the best place to find the information

    Instrument index

  • 51

    Convert 72 degrees F to Celsius

    22.2 C

  • 52

    What is the major cause of death from electrical shock

    Heart fibrillation

  • 53

    How many ¾” valves are on the figure provided?

    4

  • 54

    Which wire brush is the best brush for stainless steel materials

    Stainless steel

  • 55

    What does a venturi Tube measure

    Process flow

  • 56

    Proving a loop is a

    point to point interconnection

  • 57

    A technician is using an instrument tag number to withdraw an instrument from stores the technician is not sure if the hardware being pulled which document should the technician reference to ensure that the correct is withdrawn

    instrumentation data sheet and PO

  • 58

    Which of the following is a basic principle of alternating current flowing in a conductor

    The current flow is in one direction

  • 59

    If the proportional band of a controller is adjusted to the minimum position valve the controller action is likely to be

    On/off

  • 60

    Where can the degree of slope on a tubing run be found

    Installation drawings

  • 61

    when using soft rolled tubing it must be unrolled and straightened

    By hand

  • 62

    the term “fail open” and “fail closed” are used to describe what valve component

    Spring

  • 63

    In a cascade control loop what does a primary control loop determine for the secondary control loop

    Setpoint

  • 64

    When properly calibrated and installed the most accurate primary flow element is the

    Venturi tube

  • 65

    An orifice plate causes a pressure drop which can be measured to calculate

    Flow

  • 66

    Where should a DP flow transmitters high pressure side be connected to the orifice tape

    Upstream

  • 67

    Cleaning of piping and tubing is generally required after all of the following EXCEPT

    Modification

  • 68

    Which of the following is not the type of lead line materials used on tubing and transmitters

    copper tubing

  • 69

    When an I to P transducer is used on a pneumatic control valve that is set up to fail closed a signal input of 4mA from the control room will

    Result in an air pressure of 3 psi which will close the control valve

  • 70

    What type of input signal does a valve actuator receive from a 4 to 20ma transducer

    Pneumatic

  • 71

    PTFE tape used as a sealant should be wrapped

    In the same direction as the threads

  • 72

    When commissioning a loop

    Both the physical installation and system functions are checked

  • 73

    When simulating a turbine sensing element during calibration of a flowmeter the instrument technician might use

    A pulse source and milliamp meter

  • 74

    A displacer level instrument is withdrawn from stores and handed over to pipefitters for installation. After it is installed, the technician goes to perform the instrument checkout. The technician is not able to get the displacer to respond. What troubleshooting step should be performed first?

    Check and see if the mechanical stops installed for shipping were removed

  • 75

    Electronic instrument signal leads can be influenced by

    Noise

  • 76

    Multiple instruments within a loop share a common

    Loop number

  • 77

    Thread compound which is normally applied using a brush is called:

    Pipe dope

  • 78

    The simplest liquid level measurement device is a

    Float

  • 79

    A transmitter is not working correctly with a multimeter you check across the positive and negative terminals what is the next step

    get in series with the loop

  • 80

    What valve or pump packing material that is used where caustics, mild acids, gases, and chemicals are present?

    PTFE/Synthetic fiber

  • 81

    The final step in commissioning is

    Verifying correct operation of safety devices

  • 82

    An analog instrument has been determined to have excessive noise on th signal in troubleshooting the problem what would a technician look for

    The insulation is damaged on the signal wires

  • 83

    What is a diode

    electronic device that allows current to flow in only One Direction

  • 84

    Any person working near equipment during lockout tagout conditions is considered an

    Affected employee

  • 85

    A particulate filter is working properly, but light oil/water residue is showing up in the air. What should be done to correct this problem?

    Add a coalescing filter

  • 86

    a controller automatic control describes

    the final control element responding to an error signal or change in process

  • 87

    What will happen in a series circuit with four lights if anyone burns out

    all the lights will be out

  • 88

    When receiving instruments for the first time you should

    Inspect instrument for damage

  • 89

    What is indicated by a double solid line drawn though the instrument symbol?

    The instrument is mounted in an auxiliary location

  • 90

    Most smart transmitters

    use HART protocol communication

  • 91

    for most tube Bender radius blocks a 90 degree bend gains approximately

    1 1/2 tube diameter

  • 92

    What does a P&ID provide

    The instruments location as they relate to the process

  • 93

    fluid is flowing through the hole in end orifice plate what does the restricted fluid movement caused by size of the

    the difference in pressure

  • 94

    the following are proper and safe methods for storing tubing except

    tubing should be left uncovered

  • 95

    Which of the following should not be considered when cleaning instruments

    cleaning frequency

  • 96

    Which of these values is measured in a circuit de-energized

    Resistance

  • 97

    A decreasing output with increasing input describes:

    Reverse action

  • 98

    Shielding of signal cable is an effective method to

    Minimize EMI

  • 99

    What is the major cause of death from electrical shock

    heart fibrillation

  • 100

    Tube gain is due to the fact that

    tubing changes ID when bending occurs