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Instrument tech

Instrument tech
82問 • 2年前
  • Emmanuel Gomez
    • 通報

    問題一覧

  • 1

    The density of liquid the displacer's:

    Buoyancy

  • 2

    what mode must the controller be in before any changes are made to the process variable

    Manual

  • 3

    Bills of material are found in:

    General arrangement drawings

  • 4

    When bench calibrating a temperature RTD transmitter, the instrument technician should apply:

    Resistance

  • 5

    Before working on a de-energized circuit containing a capacitor, what must be done?

    Discharge the capacitor

  • 6

    A solenoid valve is often used to:

    Direct air flow that opens or closes an air-operated valve

  • 7

    Viscosity is analyzed in all the following ways except:

    The viscositron method

  • 8

    The process parameter that is selected for control is called:

    Controlled variable

  • 9

    The minimum value of the measured process range is considered to be:

    3 psi and 4 ma

  • 10

    Optimal gain is the maximum allowable value of gain in which the system is:

    Stable

  • 11

    Carbon dioxide is produced commercially

    As a byproduct of manufacturing

  • 12

    The most reliable relay is a/an:

    SSR

  • 13

    in modulating control, the first step is to compute the error between controlled variable and setpoint. The second step is to produce a(n):

    output signal

  • 14

    A dashpot timer relay:

    Is a type of pneumatic relay

  • 15

    Most pneumatic receivers operate in the range of:

    3-15 psi

  • 16

    A Photosensor is a :

    Silicone-controlled rectifier

  • 17

    Signal cable shields should be connected to ground at:

    1 point in the signal path

  • 18

    What best determines the required torque for bolt tensioning?

    Grade of bolt

  • 19

    Atmosphere testing must be conducted before entry into a confined space to check for:

    Oxygen content

  • 20

    A DCS accepts 1-5 volt input. The transmitter outputs are 4-20 mA. What type of resistor should normally be installed in the analog input card?

    250.0 ohms

  • 21

    A decreasing output with increasing input describes:

    Reverse action

  • 22

    The program that is permanently entered into PLC processor is called:

    Firmware

  • 23

    In properly grounded system:

    Excess voltage and current are rapidly directed to the earth

  • 24

    Pressure is expressed mathematically as:

    Decreases when controlled signal increases

  • 25

    The pneumatic output of a 3-15 psi instrument is 50%. The actual output in pressure is:

    9 psi

  • 26

    A pressure instrument, measuring level in an 80-foot water storage tank on the structure above the instrument, sees a static head of about 120 feet when the tank is at zero level. The upper range the instrument must measure is no more than:

    100 psi

  • 27

    All of the following are volumetric flow rates except:

    SCGF

  • 28

    Single-point grounding of signal cable shields:

    Drains induced voltage from shields

  • 29

    A valve has a linear-flow characteristics when the:

    Differential pressure corresponds directly to the valve stem position

  • 30

    A time relay is energized and 10 seconds pass before the contacts in the relay are actuated. This is an example of:

    On-delay

  • 31

    Which of the following is used to calibrate a DP transmitter?

    Wally box

  • 32

    Troubleshooting flow charts are most effective when

    Problems are identified

  • 33

    The binary system is a base

    2 system

  • 34

    A common unit for volume of gas is:

    SCFM

  • 35

    Pressure switches are actuated by:

    Bellows, diaphragms, or bourbon tubes

  • 36

    Significant digits:

    Describe accuracy limits of measurement or calculation

  • 37

    1 meter is:

    39.3 inches

  • 38

    The span of an instrument with 24-36 psig input is:

    12 psi

  • 39

    All of the following valves are used to regulate flow, except:

    Gate

  • 40

    The device that is used to check the integrity of tubing is the:

    Wallace and tieman calibrator

  • 41

    A controller receives an input signal from a :

    Measuring element

  • 42

    All of the following are typical applications of photocell except:

    Size detection

  • 43

    Multiple instruments within a loop share a common:

    Loop number

  • 44

    What is a thermowell?

    Protective device to house a thermocouple

  • 45

    What is the major cause of death from electrical shock

    Heart fibrillation

  • 46

    The hydrostatic pressure created in a 10 foot tank with 8 feet water level is:

    8 psi

  • 47

    Cutting oil are classified as:

    Active & inactive

  • 48

    Gaskets are usually specified for particular ranges of:

    Temperature and pressure

  • 49

    Pressure is expressed mathematically as:

    P= F/A

  • 50

    A Chromatograph is used to:

    Determine the chemical composition ofa liquid or gas

  • 51

    Which of the following adjustments on a pressure transmitter sets the minimum range value?

    Zero

  • 52

    Proving a loop is a :

    Simulated test run

  • 53

    A transmitter has a range 0-304.7" wc. What is the range in PSI?

    0-11 psi

  • 54

    Which of the following materials is selected when resistance to corrosion or high temperatures is required ?

    non ferrous alloy

  • 55

    Which of the following describes span?

    The difference between 3 and 15

  • 56

    How many cycles is a kilohertz

    1000

  • 57

    A flow meter best suited for suspended solids is a :

    Target flow meter

  • 58

    DCS stands for:

    Distributed Control System

  • 59

    The hardness of a metal is reflected in its ability to resist:

    Denting

  • 60

    How is an annunciator used in a control room

    To signal alarms from a field location to the control room

  • 61

    A gauge pressure of 195 psi is roughly what in psia

    210

  • 62

    At high altitudes, the atmospheric pressure is

    Lower than the atmospheric pressure at lower altitudes

  • 63

    When using a DP transmitter for flow measurement, what is the most commonly used Primary element?

    Orifice plate

  • 64

    On what principle do mass flow meters operate?

    Coriolis

  • 65

    What kind of resistance should be present when checking for grounds

    Low or none

  • 66

    A bourbon tube is normally found inside :

    Pressure gauge

  • 67

    The standard reference material used in resistance temperature detectors is

    Platinum

  • 68

    Which test equipment below is most suitable for calibrating a temperature transmitter with a thermocouple-sensing element?

    Milivolt simulator

  • 69

    When an electronic D/P cells is calibrated, the simulated input pressure should be connect to the transmitter's

    High side

  • 70

    In a normal DP cell calibration, the low- pressure side is:

    Vented to the atmosphere

  • 71

    Density is analyzed using all the following methods except:

    Air bubbler

  • 72

    A PLC is controlled by:

    Microprocessors

  • 73

    If all AND gate inputs are true, the output will be:

    True

  • 74

    The greatest inaccuracy of a differential pressure level detector is caused by a change in the

    Density of the liquid being measured

  • 75

    When tuning a controller, increasing gain:

    Increases precision

  • 76

    All of the following are loop tuning parameters except

    P&ID

  • 77

    The ultimate period method for tuning a controller was first proposed by:

    Ziegler and Nichols

  • 78

    The instrument signal the line symbol (- - - - - ), a broken line with no marks drawn it, represents

    An electric signal

  • 79

    Which of the following is a type of gasket used in high- pressure systems?

    Metal ring joint

  • 80

    Which of the following thread sealants is most suitable for service temperature to 700 degrees F

    Graphite paste

  • 81

    Increasing the carbon content in steel results in an increase in:

    Hardness

  • 82

    1 PSI=

    27.7 inches of water in of H2O

    • Emmanuel Gomez · 13問 · 1年前

    13問 • 1年前
    Emmanuel Gomez

    問題一覧

  • 1

    The density of liquid the displacer's:

    Buoyancy

  • 2

    what mode must the controller be in before any changes are made to the process variable

    Manual

  • 3

    Bills of material are found in:

    General arrangement drawings

  • 4

    When bench calibrating a temperature RTD transmitter, the instrument technician should apply:

    Resistance

  • 5

    Before working on a de-energized circuit containing a capacitor, what must be done?

    Discharge the capacitor

  • 6

    A solenoid valve is often used to:

    Direct air flow that opens or closes an air-operated valve

  • 7

    Viscosity is analyzed in all the following ways except:

    The viscositron method

  • 8

    The process parameter that is selected for control is called:

    Controlled variable

  • 9

    The minimum value of the measured process range is considered to be:

    3 psi and 4 ma

  • 10

    Optimal gain is the maximum allowable value of gain in which the system is:

    Stable

  • 11

    Carbon dioxide is produced commercially

    As a byproduct of manufacturing

  • 12

    The most reliable relay is a/an:

    SSR

  • 13

    in modulating control, the first step is to compute the error between controlled variable and setpoint. The second step is to produce a(n):

    output signal

  • 14

    A dashpot timer relay:

    Is a type of pneumatic relay

  • 15

    Most pneumatic receivers operate in the range of:

    3-15 psi

  • 16

    A Photosensor is a :

    Silicone-controlled rectifier

  • 17

    Signal cable shields should be connected to ground at:

    1 point in the signal path

  • 18

    What best determines the required torque for bolt tensioning?

    Grade of bolt

  • 19

    Atmosphere testing must be conducted before entry into a confined space to check for:

    Oxygen content

  • 20

    A DCS accepts 1-5 volt input. The transmitter outputs are 4-20 mA. What type of resistor should normally be installed in the analog input card?

    250.0 ohms

  • 21

    A decreasing output with increasing input describes:

    Reverse action

  • 22

    The program that is permanently entered into PLC processor is called:

    Firmware

  • 23

    In properly grounded system:

    Excess voltage and current are rapidly directed to the earth

  • 24

    Pressure is expressed mathematically as:

    Decreases when controlled signal increases

  • 25

    The pneumatic output of a 3-15 psi instrument is 50%. The actual output in pressure is:

    9 psi

  • 26

    A pressure instrument, measuring level in an 80-foot water storage tank on the structure above the instrument, sees a static head of about 120 feet when the tank is at zero level. The upper range the instrument must measure is no more than:

    100 psi

  • 27

    All of the following are volumetric flow rates except:

    SCGF

  • 28

    Single-point grounding of signal cable shields:

    Drains induced voltage from shields

  • 29

    A valve has a linear-flow characteristics when the:

    Differential pressure corresponds directly to the valve stem position

  • 30

    A time relay is energized and 10 seconds pass before the contacts in the relay are actuated. This is an example of:

    On-delay

  • 31

    Which of the following is used to calibrate a DP transmitter?

    Wally box

  • 32

    Troubleshooting flow charts are most effective when

    Problems are identified

  • 33

    The binary system is a base

    2 system

  • 34

    A common unit for volume of gas is:

    SCFM

  • 35

    Pressure switches are actuated by:

    Bellows, diaphragms, or bourbon tubes

  • 36

    Significant digits:

    Describe accuracy limits of measurement or calculation

  • 37

    1 meter is:

    39.3 inches

  • 38

    The span of an instrument with 24-36 psig input is:

    12 psi

  • 39

    All of the following valves are used to regulate flow, except:

    Gate

  • 40

    The device that is used to check the integrity of tubing is the:

    Wallace and tieman calibrator

  • 41

    A controller receives an input signal from a :

    Measuring element

  • 42

    All of the following are typical applications of photocell except:

    Size detection

  • 43

    Multiple instruments within a loop share a common:

    Loop number

  • 44

    What is a thermowell?

    Protective device to house a thermocouple

  • 45

    What is the major cause of death from electrical shock

    Heart fibrillation

  • 46

    The hydrostatic pressure created in a 10 foot tank with 8 feet water level is:

    8 psi

  • 47

    Cutting oil are classified as:

    Active & inactive

  • 48

    Gaskets are usually specified for particular ranges of:

    Temperature and pressure

  • 49

    Pressure is expressed mathematically as:

    P= F/A

  • 50

    A Chromatograph is used to:

    Determine the chemical composition ofa liquid or gas

  • 51

    Which of the following adjustments on a pressure transmitter sets the minimum range value?

    Zero

  • 52

    Proving a loop is a :

    Simulated test run

  • 53

    A transmitter has a range 0-304.7" wc. What is the range in PSI?

    0-11 psi

  • 54

    Which of the following materials is selected when resistance to corrosion or high temperatures is required ?

    non ferrous alloy

  • 55

    Which of the following describes span?

    The difference between 3 and 15

  • 56

    How many cycles is a kilohertz

    1000

  • 57

    A flow meter best suited for suspended solids is a :

    Target flow meter

  • 58

    DCS stands for:

    Distributed Control System

  • 59

    The hardness of a metal is reflected in its ability to resist:

    Denting

  • 60

    How is an annunciator used in a control room

    To signal alarms from a field location to the control room

  • 61

    A gauge pressure of 195 psi is roughly what in psia

    210

  • 62

    At high altitudes, the atmospheric pressure is

    Lower than the atmospheric pressure at lower altitudes

  • 63

    When using a DP transmitter for flow measurement, what is the most commonly used Primary element?

    Orifice plate

  • 64

    On what principle do mass flow meters operate?

    Coriolis

  • 65

    What kind of resistance should be present when checking for grounds

    Low or none

  • 66

    A bourbon tube is normally found inside :

    Pressure gauge

  • 67

    The standard reference material used in resistance temperature detectors is

    Platinum

  • 68

    Which test equipment below is most suitable for calibrating a temperature transmitter with a thermocouple-sensing element?

    Milivolt simulator

  • 69

    When an electronic D/P cells is calibrated, the simulated input pressure should be connect to the transmitter's

    High side

  • 70

    In a normal DP cell calibration, the low- pressure side is:

    Vented to the atmosphere

  • 71

    Density is analyzed using all the following methods except:

    Air bubbler

  • 72

    A PLC is controlled by:

    Microprocessors

  • 73

    If all AND gate inputs are true, the output will be:

    True

  • 74

    The greatest inaccuracy of a differential pressure level detector is caused by a change in the

    Density of the liquid being measured

  • 75

    When tuning a controller, increasing gain:

    Increases precision

  • 76

    All of the following are loop tuning parameters except

    P&ID

  • 77

    The ultimate period method for tuning a controller was first proposed by:

    Ziegler and Nichols

  • 78

    The instrument signal the line symbol (- - - - - ), a broken line with no marks drawn it, represents

    An electric signal

  • 79

    Which of the following is a type of gasket used in high- pressure systems?

    Metal ring joint

  • 80

    Which of the following thread sealants is most suitable for service temperature to 700 degrees F

    Graphite paste

  • 81

    Increasing the carbon content in steel results in an increase in:

    Hardness

  • 82

    1 PSI=

    27.7 inches of water in of H2O