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 (C)</p> Signup and view all the answers

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

<p>Convenience (D)</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 (A)</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 (D)</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 (C)</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 (D)</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 (A)</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 (B)</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 (D)</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 (B)</p> Signup and view all the answers

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

<p>Clean them (C)</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 (A)</p> Signup and view all the answers

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

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

What type of tachometer is suitable for distributorless ignition systems?

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

What is the main purpose of a timing light?

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

How do digital tachometers measure engine speed?

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

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

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

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

<p>Spark advance (A)</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 (A)</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 (D)</p> Signup and view all the answers

How do inductive pickup tachometers work?

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

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

<p>To rotate the thimble (D)</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 (A)</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 (C)</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 (B)</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 (B)</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 (B)</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 (D)</p> Signup and view all the answers

What is the first step in developing records and documents?

<p>Keep it short and simple (B)</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 (D)</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 (C)</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 (B)</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 (B)</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 (B)</p> Signup and view all the answers

What is the purpose of preparing reports?

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

Flashcards

Digital Reading Tape Measure

A tool used to measure long, straight distances accurately.

Vernier Caliper

A precision measuring tool for inside, outside, and depth measurements with high accuracy.

Inside Diameter Measuring Jaws

The part of a vernier caliper used to measure the distance between two inner surfaces.

Outside Diameter Measuring Jaws

The part of a vernier caliper used to measure the distance between two outer surfaces.

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Stop Screw

A screw on a vernier caliper used to lock the movable jaw in place.

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Vernier Scale

A graduated scale on a vernier caliper used for precise measurements.

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Main Scale

The main scale on a vernier caliper, typically in inches or millimeters.

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Depth Rod Measurement

A measurement taken using the depth rod on a vernier caliper to determine the depth of a hole or cavity.

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Depth Rod

A rod on a vernier caliper used to measure the depth of a hole or cavity.

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Thickness Gauges

Tools used to measure very small distances, like clearances between parts.

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Tachometers

Devices used to measure engine speed in revolutions per minute (RPM).

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Analog Tachometers

Tachometers that use a needle to display the engine speed.

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Digital Tachometers

Tachometers that use a digital display to show the engine speed.

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Inductive Pickup Tachometers

Tachometers that use an inductive sensor to measure engine speed.

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Timing Light Analyzer

A tool used to check the timing of an engine's ignition system.

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Inductive Clamp

A clamp on a timing light that is placed over a spark plug wire to detect the spark.

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Timing Advance Knob

A knob on a timing light used to adjust the timing advance setting.

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Spark Tester

A tool used to check for spark in an ignition system.

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Grounding Clamp

A clamp on a spark tester that is connected to ground.

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Dial Indicator

A precise measurement tool used to measure small distances and displacements.

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Dial Face

The circular face of a dial indicator that shows the measurement.

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Classification and Measuring Range

The specific type of measurement the dial indicator can make and the maximum value it can measure.

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Counter

A feature on a dial indicator that indicates the number of turns the pointer has made.

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Rod

The part of a dial indicator that extends from the base and is used to contact the object being measured.

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Spindle

The shaft that connects the rod to the dial face and allows it to move.

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Vernier Caliper Adjustment

The process of setting the vernier caliper to accurately measure an object.

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Micrometer

A precision measuring tool for very small distances, using a thimble to adjust the measurement.

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Anvil

The stationary part of a micrometer on which the object being measured is placed.

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Thimble

The rotating part of a micrometer that is used to adjust the spindle.

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Ratchet Speeder

A mechanism on a micrometer that helps quickly rotate the thimble.

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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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