E&I - DGC

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scooter
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266646
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E&I - DGC
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2014-03-16 20:44:57
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DGC
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  1. Gaskets and o-rings are two kinds of _______ seals.
    Mechanical
  2. O-rings require a(n)_________ to create a seal.
    Groove
  3. __________ compensate for temperature fluctuations in a control loop.
    Expansion loops
  4. __________ achieve a tight seal by forcing the flared edge of the tubing up against the tapered end of the fitting body.
    flared fittings
  5. ______ tubing is corrosion-resistant and suitable for high-temperature, high-pressure applications.
    stainless steel
  6. Leak detector fluid is essential when trying to locate ____ leaks in instrument connections.
    air
  7. Metals that are to be soldered must be thoroughly cleaned _______ flux is applied.
    before
  8. Flux and discoloration may be removed from the fitting after a joint has been made using____.
    • emery cloths
    • wire brushes
  9. The preferred cutting tools for stainless steel tubing are ___
    tube cutters
  10. _____ are food tools for removing dirt, oil and other residue from fittings and tubing before solder is applied.
    • emery cloths
    • lint-free cloths
  11. The materials of which mechanical seals are made must be ____ with the process materials of the applications in which they are used.
    Compatible
  12. Bends require ______ tubing than square corners.
    less
  13. The wall thickness of tubing is determined by its ______.
    inside and outside diameters
  14. ________ tubing may be found as a single tube or as a bundle of single tubes within a protective sheath.
    plastic
  15. Flux residue can sause stainless steel tubing to ______.
    corrode
  16. Applications in which pneumatic signals must be carried between instruments commonly use ___ and___
    • plastic tubing
    • stainless steel tubing
  17. Every electrical connection should be tested for ___ after any installation or repair work is done.
    resistance
  18. it is essential to _________ before beginning any work on a circuit in the field.
    verify the circuit de-energized
  19. With coaxial cable connectors, the cable shield is usually inserted through a hole in the _______.
    grounding tab
  20. Check _________ terminal connections from the point at which the lost signal symptom appears.
    sequential
  21. The voltage rating of a wire is determined by the ____ of the conductor.
    insulation
  22. According to ohm's law, if voltage remains constant and resistance decreases, current will _____.
    Increase
  23. a poor solder joint will be ___
    • dull
    • grainy
  24. metal bubbling up form the access hole in a coaxial cable connector indicates that the joint is ____.
    solid
  25. ____ is used to protect instrument signals passing through lines of flux from high-voltage equipment form being distorted or lost.
    shielded cable
  26. Grounding a shielded cable at ____ can create a ground loop.
    two points
  27. ________ tests should be done on every electrical connection after any installation or repair work is done.
    resistance
  28. when verifying that a circuit is de-energized, it is important to test the operation of the multimeter ____ testing the circuit.
    before and after
  29. when installing a coaxial calbe connector, the _____ is usually inserted through a hole in the grounding tab
    shield
  30. Check sequential terminal connections from the point at which the lost signal symptom appears for ____
    • loose connections
    • frayed wires
    • broken conductors
  31. _______ is the difference between the actual value of the measured variable and the value of the variable indicated by the instrumentation.
    instrument error
  32. factors that should always be considered when analyzing an instrument's accuracy rating are _____ and ________.
    • rangeability 
    • mounting position
  33. Errors that can be observed on a calibration curve or input/output graph include ______, ___,___, and ____.
    • zero shift
    • hysteresis
    • span error
    • non-linearity
  34. characteristics that affect an instrument's accuracy in terms of the manufacutrer's accuracy rating include dead band, linearity, ______ and ______.
    • repeatablility
    • hysteresis
  35. an instrument is ___ if it is capable of consistently providing repeatable values for a given input.
    precise
  36. position errors may be caused by _____.
    • calibrating in position different from installation position
    • mechanical deformation of instrument
  37. in order to permit the observation of linearity apart from the phenomena of hysteresis and dead band, it is necessary to plot an ___ curve.
    average curve
  38. ______ is the closeness of agreement among several consecutive measurements of an instrument's output values.
    repeatability
  39. errors in interpretation may be caused by __.
    parallax
  40. instrument errors that can usually be corrected during calibration include _______.
    None of the above. answers to choose from are, non-linearity/hysteresis/dead band.
  41. errors in __________ may be caused by misreading the value of scale subdivisions or incorrectly estimating readings in which pointer s located between divisions or subdivisions.
    parallax
  42. on an input/output graph, a zero shift line ____.
    all of the above, may be above the ideal line/may be below the ideal line/will not intersect the ideal line.
  43. linearity is expressed as a
    percent of output
  44. with _____, the response of the sensing element does not catch up to the input signal until the upper or lower ranges of the instrument are approached.
    hysteresis
  45. the smallest change in a measured variable to which an instrument will respond is a characteristic known as
    sensitivity
  46. on an input/output graph, ____ is represented as a straight line that is at a different angle than the ideal line.
    span error
  47. with _______, all of the output readings are either consistently high or consistently low throughout the entire range.
    zero shift
  48. ____ is the ratio of the maximum to minimum values of a measured variable that an instrument can measure within stated accuracy to the minimum value of the measured variable that it can measure with stated accuracy.
    turndown
  49. an instrument's repeatablility is expressed as
    percentage of output span
  50. _______ is the ratio of the instrument's maximum full scale range to its minimum full scale range.
    rangeability
  51. which of the following instrument errors can generally be adjusted.
    • zero shift
    • span error
  52. which of these occurrences normally requires that an instrument should be re-calibrated?
    extended shutdown
  53. what is the signal range of an analog electronic pressure transmitter?
    4-20 mA
  54. which of the following is the first step in a good calibration procedure?
    determination of signal range
  55. the proper formula used to determine the accuracy of a temperature tranmitter is:
    accuracy = deviation/signal span * 100
  56. gain is a function of
    input/output relationship
  57. in looking for indications of hysteresis, it is essential to
    take upscale and downscale readings
  58. the accurate measurement and comparison of an instrument's inputs and outputs to a known standard is a definition of
    calibration
  59. the most accurate standards are those with the _____ tolerances.
    smallest
  60. ________ standards use physical properties of matter and physical laws to provide a standard for comparison.
    primary
  61. calibration certification facilities use standards from _______ to calibrate their standards.
    NIST
  62. manometers can indicate pressure in
    • inches of water
    • psi
    • inches of mercury
  63. in order to obtain an measurement from a u-tube manometer, it is necessary to read
    both legs
  64. to ensure accurate calibrations, gloves should be worn when handling the ____ used with dead weight testers
    weights
  65. when selecting piston/cylinder assemblies, it is good practice to choose the ____ available tester range that includes the pressure range of the instrument to be calibrated.
    lowest
  66. the operating fluid in pneumatic testers is a
    gas
  67. in a pneumatic dead weight tester, the pressure balance point is achieved by forces acting on a ______ assembly.
    ball and nozzle
  68. the least accurate standard are those with the _____ tolerances.
    widest
  69. _______ standards are extremely precise instruments used for the calibration of plant instruments and systems.
    secondary
  70. calibration certification facilities provide standards for _________ to use to calibrate their standards.
    industrial plants
  71. in a u-tube manometer, the reference level is the term used to describe the level apparent when pressure is ______.
    not being applied.
  72. the _______ is the curve of the fill fluid level.
    meniscus
  73. a (n) __________ manometer is designed to provide greater accuracy from measuring small pressure changes.
    inclined
  74. ____ are sets consisting of precision parts that are not interchangeable with components in other sets.
    cylinders and weight systems
  75. flushing the connection before connecting the test instrument to be calibrated to a hydraulic dead weight testers instrument connection port ensures that there are no _________ in the system.
    air bubbles
  76. the operating fluid in hydraulic testers is a ____
    • liquid 
    • oil
  77. in a hydraulic dead weight tester, the pressure balance point is achieved by forces acting on a ____ assembly
    piston and cylinder
  78. what features may be found on test gauges that differ from those found on general-purpose pressure gauges?
    • mirrored scales
    • multiple scales
  79. _________ is an optical illusion created by the distance between the gauge face and the pointer, or indicator, and the angle at which the reading is viewed
    parallax
  80. the eyes of the viewer reading a gauge should be at a ____ angle to the scale in order to ensure accurate readings.
    • right
    • 90-degree
  81. after a test gauge has been subjected to shock, it can be returned to service only after it has been
    calibrated
  82. in addition to functioning as primary calibration standards, deadweight testers can also be used as ______ for high pressure instrument calibrations.
    input pressure sources
  83. analog-display calibrators allow ______ comparison of an instruments input and output signals under test conditions.
    direct
  84. because most pneumatic calibrators are _________, they can be used for field checks and calibration of instruments in their normal operating locations.
    portable
  85. owing to the hazardous or toxic process fluids to which they may be exposed, all instruments should be _____ and __ before being calibrated.
    • cleaned
    • decontaminated
  86. during a calibration, the pressure sensor must be _________ after each pressure value has been applied.
    vented
  87. while setting up the unit for a calibration, the regulators on a calibrator should be checked to determine that they are at their ____ setting.
    lowest
  88. mirrored scales and multiple scales are more likely to be found on ___ gauges
    test
  89. parallax is a(n) _______ created by the distance between the gauge face and the pointer, or indicator, and the angle at which the reading is viewed.
    optical illusion.
  90. the eyes of the viewer reading the gauge should be at a right angle to the _____ in order to ensure accurate readings.
    display
  91. after a test gauge has been subjected to shock, it cannot be returned to service until it has been ____
    calibrated
  92. deadweight testers can be used as _____ for high pressure instrument calibrations, in addition to functioning as primary calibration standards.
    input pressure sources
  93. digital display calibrators allow ______ comparison of an instrument's input and output signals under test conditions.
    direct
  94. because most digital-display pneumatic calibrators are ____, they can be used for field checks and calibration of instruments in their normal operating locations.
    portable
  95. all instruments should be ____ and ____ before being calibrated, due to the hazardous or toxic process fluids to which they may be exposed.
    • cleaned 
    • decontaminated
  96. during a calibration, the _____ must be vented after each pressure value has been applied.
    pressure sensor
  97. while setting up the unit for a calibration, the ____ must be connected to the calibrator and to the instrument being calibrated.
    air supply
  98. instruments are calibrated to ensure that their __ accurately represents the input.
    output
  99. instruments should be calibrated in the following situations:
    all of the above. transferring the instrument to a new control loop/following the repair to the instrument/ prior to installation.
  100. information on the recommended setup for a calibration can usually be found in
    manufactures instructions
  101. to prevent erroneous indications, instrument ______ should be checked to ensure that they are tight and leak free.
    connections
  102. if the instrument under test is rated for an accuracy of plus or minus 1, the output standard selected for a calibration should ideally have a accuracy of plus or minus __.
    .1
  103. the test points selected for calibration should include values (at or within) _______ percent of the instruments upper and lower range values.
    10
  104. during an upscale check, test points should be approached form _______ .
    below
  105. it is unlikely that some ______ errors will be discerned in a three-point calibration check.
    linearity
  106. it is important to allow the ____ value to stabilize before recording the data
    output
  107. milliammeters are usually connected in ____with the instrument under test when they are used as output standards.
    series
  108. instruments should be calibrated in the following situations:
    all of the above. after changing the position in which it is mounted/prior to repair of the instrument/after determining that product does not meet specifications
  109. ideally, the output standard selected for a calibration should be plus or minus 0.1, if the instrument under test is rated for an accuracy of plus of minus. ____.
    • 1
    • 1.0
  110. during a downscale check, test points should be approached from ____
    above
  111. if zero shift and span errors are revealed during a series of calibration cycles, ____ is usually corrected first
    zero shift
  112. ___ defines the highest and lowest values of the measured variable that an instrument is designed to measure, receive, or transmit.
    range
  113. ___ is the algebraic difference between and the upper and lower values of an instruments range.
    span
  114. the test points selected for calibration should include values at or within ten percent of the upper and lower ____ values
    scan
  115. after any required adjustments have been made, another _____ should be performed to verify the results of the adjustments.
    calibration cycle
  116. the following information can usually be located in the manufacturers instructions accompanying a measuring or indicating instrument.
    all of the above. recommended setups/test conditions/adjustment points for zero, span, and linearity
  117. a calibration _____ simulates the process variables to be measured by the instrument under test.
    setup

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