Measuring Instruments: Digital Reading Tape Measure and Vernier Caliper
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Questions and Answers

What is the primary function of a Vernier Caliper?

  • To measure thickness of materials
  • To make large straight line measurements
  • To measure small distances such as clearance between two parts
  • To measure inside, outside, and depth measurements with considerable accuracy (correct)

    • What is the minimum measurement that can be taken with a Vernier Caliper?

  • 0.1 mm
  • 0.001 inches (0.025 mm) (correct)
  • 0.025 mm
  • 0.01 mm

    • What is the purpose of a dial gauge attached to a Vernier Caliper?

  • To increase the accuracy of measurements
  • To take measurements in inches
  • To measure the thickness of materials
  • To make the 'thousandths' part of a measurement easier to read (correct)

    • What is the name of the tool used to measure small distances such as clearance between two parts?

    <p>Thickness Gauges</p> Signup and view all the answers

    What is the main advantage of using a Vernier Caliper over a Micrometer?

    <p>Convenience</p> Signup and view all the answers

    What is the name of the part of the Vernier Caliper used to measure the depth of an object?

    <p>Depth rod</p> Signup and view all the answers

    What is the purpose of a Thickness Gauge?

    <p>To measure small distances such as clearance between two parts</p> Signup and view all the answers

    What is the unit of measurement that can be read on a Vernier Caliper?

    <p>Millimeters and inches</p> Signup and view all the answers

    What is the purpose of the classification on the dial face of the gauge?

    <p>To indicate the measuring range</p> Signup and view all the answers

    What is the first step in taking a measurement with a dial indicator?

    <p>Select the best mounting attachment and a suitable contact point</p> Signup and view all the answers

    Why is it important to turn the dial face during measurement?

    <p>To place the zero line over the dial needle</p> Signup and view all the answers

    What should you do to ensure the accuracy of measurement with a dial indicator?

    <p>All of the above</p> Signup and view all the answers

    How should the legs of the vernier caliper be aligned with the object to be measured?

    <p>Parallel to the object</p> Signup and view all the answers

    What should you do to the objects to be measured with a vernier caliper?

    <p>Clean them</p> Signup and view all the answers

    What is the purpose of the lock screw on a vernier caliper?

    <p>To lock the movable leg close to the surface</p> Signup and view all the answers

    Why is it important to check the accuracy of a vernier caliper?

    <p>To ensure accurate measurements</p> Signup and view all the answers

    What type of tachometer is suitable for distributorless ignition systems?

    <p>Inductive pickup tachometer</p> Signup and view all the answers

    What is the main purpose of a timing light?

    <p>To check ignition timing</p> Signup and view all the answers

    How do digital tachometers measure engine speed?

    <p>By measuring ignition pulses</p> Signup and view all the answers

    What is the function of a spark tester?

    <p>To determine if the ignition problem is in the primary or secondary circuit</p> Signup and view all the answers

    What type of tachometer clamps over the number 1 spark plug wire?

    <p>Inductive pickup tachometer</p> Signup and view all the answers

    What is displayed on the LED display of some timing lights?

    <p>Spark advance</p> Signup and view all the answers

    What is the main difference between a spark tester and a spark plug?

    <p>The spark tester has a grounding clamp</p> Signup and view all the answers

    What is the purpose of the Vernier scale in a micrometer?

    <p>To add additional digits to the measurement</p> Signup and view all the answers

    How do inductive pickup tachometers work?

    <p>By monitoring magnetic pulses in the spark plug wire</p> Signup and view all the answers

    How do you determine the value of the additional digits on the Vernier scale?

    <p>By aligning the Vernier scale with a line on the main scale</p> Signup and view all the answers

    What is the purpose of the ratchet speeder in a micrometer?

    <p>To rotate the thimble</p> Signup and view all the answers

    What do you need to ensure when adding the main scale and Vernier scale readings together?

    <p>That the units are the same</p> Signup and view all the answers

    What is the purpose of the anvil in a micrometer?

    <p>To clamp the object between the anvil and spindle</p> Signup and view all the answers

    What is the correct order of steps when using a micrometer?

    <p>Position object, clamp object, rotate thimble</p> Signup and view all the answers

    What is the final measurement if the main scale reads 2.6 inches and the Vernier scale reads 0.014 inches?

    <p>2.614 inches</p> Signup and view all the answers

    Why is it important to ensure the units are the same when adding the main scale and Vernier scale readings together?

    <p>To ensure accurate measurement</p> Signup and view all the answers

    What is the main purpose of an annual report?

    <p>To present the actions and accomplishments of an organization during the financial year</p> Signup and view all the answers

    What is the first step in developing records and documents?

    <p>Keep it short and simple</p> Signup and view all the answers

    What is the last step in the problem reporting procedure?

    <p>Maintain damaging parts according to maintenance procedure</p> Signup and view all the answers

    What is the purpose of a standardized, consistent format in developing records and documents?

    <p>To help staff learn quickly</p> Signup and view all the answers

    What is the main purpose of evaluating the relevance, efficiency, effectiveness, impact, and sustainability of a project/program?

    <p>To cover most if not all evaluation indicators</p> Signup and view all the answers

    What is the benefit of using bullet points and flow diagrams in developing records and documents?

    <p>It makes it easy to understand complex information</p> Signup and view all the answers

    What is the importance of clarity in developing records and documents?

    <p>It makes it easy to understand complex information</p> Signup and view all the answers

    What is the purpose of preparing reports?

    <p>To have no error or discrepancy</p> Signup and view all the answers

    Study Notes

    Digital Reading Tape Measure

    • Used for large straight line measurements

    Vernier Caliper

    • A sliding measuring device that can make inside, outside, and depth measurements with considerable accuracy
    • Can take measurements as small as 0.001" (0.025 mm)
    • May have a dial gauge attached, which makes the "thousandths" part of a measurement easier to read
    • Can take inside, outside, and depth measurements to within hundredths or thousandths of a millimeter or thousandths of an inch
    • Parts include:
      • Inside diameter measuring jaws
      • Outside diameter measuring jaws
      • Stop screw
      • Vernier scale
      • Main scale
      • Depth rod measurement
      • Depth rod

    Thickness Gauges

    • Also known as "feeler" gauges
    • Used to measure small distances, such as clearance between two parts
    • Example: checking the clearance between the rocker arm and valve stem in an engine

    Tachometers

    • Used to measure engine speed
    • Available in analog and digital types
    • Digital meters are the most common
    • Can be connected to the ignition system to monitor ignition pulses, which are then converted to engine speed
    • Inductive pickup tachometers simplify rpm testing and can be used for distributorless ignition systems

    Timing Light Analyzer

    • Used to check ignition timing
    • Connected to the battery terminals and has an inductive clamp that fits over the number 1 spark plug wire
    • Emits a beam of light each time the spark plug fires
    • Some timing lights have a timing advance knob that can be used to check spark advance
    • Can electronically measure timing advance as the engine rpm is increased and display it on an LED display

    Spark Tester

    • A fake spark plug used to determine if the ignition problem is caused by something in the primary or secondary circuit
    • Constructed like a spark plug but without a ground electrode
    • Has a grounding clamp instead of an electrode
    • Inserted into the spark plug end of an ignition cable

    Dial Indicator

    • Used to measure small distances
    • Has a dial face with a classification and measuring range
    • Has a counter that indicates the number of turns the pointer is turned by
    • How to read dial indicators:
      • Make certain that the best mounting attachment and a suitable contact point are selected
      • Ensure the dial indicator and base are firmly attached and the measuring rod is parallel to the object being measured
      • Check that the rod, spindle, and dial needle move freely and the dial range is adjusted to measure the full movement of the object
      • Turn the dial face so that the zero line is placed over the dial needle
      • Take at least two readings and move or turn the object against its stop or end of travel to ensure accuracy

    Checking and Adjusting Measuring/Testing Devices

    • How to adjust vernier caliper:
      • Clean the legs and check the tool for accuracy
      • Clean the objects to be measured and slide the movable leg close to the surface
      • Lock the leg with the lock screw to the bar
      • Be certain that the legs are parallel to the object to be measured and do not force the legs together
      • Adjust the leg with adequate force so that the object just sits between the two legs
      • Find the first mark on the Vernier scale that lines up perfectly with any line on the main scale
      • Add the main scale and Vernier scale results together to get the final answer
    • Using a micrometer:
      • Position the object to be measured on the anvil
      • Clamp the object between the anvil and spindle
      • Rotate the thimble using the ratchet speeder until the spindle is close to the object
      • Carefully turn the ratchet as you approach the surface to be measured and continue until the spindle stops rotating

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    Description

    This quiz covers the uses and measurements of digital reading tape measures and Vernier Calipers, including their accuracy and applications.

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