40 Questions
What is the primary function of a Vernier Caliper?
To measure inside, outside, and depth measurements with considerable accuracy
What is the minimum measurement that can be taken with a Vernier Caliper?
0.001 inches (0.025 mm)
What is the purpose of a dial gauge attached to a Vernier Caliper?
To make the 'thousandths' part of a measurement easier to read
What is the name of the tool used to measure small distances such as clearance between two parts?
Thickness Gauges
What is the main advantage of using a Vernier Caliper over a Micrometer?
Convenience
What is the name of the part of the Vernier Caliper used to measure the depth of an object?
Depth rod
What is the purpose of a Thickness Gauge?
To measure small distances such as clearance between two parts
What is the unit of measurement that can be read on a Vernier Caliper?
Millimeters and inches
What is the purpose of the classification on the dial face of the gauge?
To indicate the measuring range
What is the first step in taking a measurement with a dial indicator?
Select the best mounting attachment and a suitable contact point
Why is it important to turn the dial face during measurement?
To place the zero line over the dial needle
What should you do to ensure the accuracy of measurement with a dial indicator?
All of the above
How should the legs of the vernier caliper be aligned with the object to be measured?
Parallel to the object
What should you do to the objects to be measured with a vernier caliper?
Clean them
What is the purpose of the lock screw on a vernier caliper?
To lock the movable leg close to the surface
Why is it important to check the accuracy of a vernier caliper?
To ensure accurate measurements
What type of tachometer is suitable for distributorless ignition systems?
Inductive pickup tachometer
What is the main purpose of a timing light?
To check ignition timing
How do digital tachometers measure engine speed?
By measuring ignition pulses
What is the function of a spark tester?
To determine if the ignition problem is in the primary or secondary circuit
What type of tachometer clamps over the number 1 spark plug wire?
Inductive pickup tachometer
What is displayed on the LED display of some timing lights?
Spark advance
What is the main difference between a spark tester and a spark plug?
The spark tester has a grounding clamp
What is the purpose of the Vernier scale in a micrometer?
To add additional digits to the measurement
How do inductive pickup tachometers work?
By monitoring magnetic pulses in the spark plug wire
How do you determine the value of the additional digits on the Vernier scale?
By aligning the Vernier scale with a line on the main scale
What is the purpose of the ratchet speeder in a micrometer?
To rotate the thimble
What do you need to ensure when adding the main scale and Vernier scale readings together?
That the units are the same
What is the purpose of the anvil in a micrometer?
To clamp the object between the anvil and spindle
What is the correct order of steps when using a micrometer?
Position object, clamp object, rotate thimble
What is the final measurement if the main scale reads 2.6 inches and the Vernier scale reads 0.014 inches?
2.614 inches
Why is it important to ensure the units are the same when adding the main scale and Vernier scale readings together?
To ensure accurate measurement
What is the main purpose of an annual report?
To present the actions and accomplishments of an organization during the financial year
What is the first step in developing records and documents?
Keep it short and simple
What is the last step in the problem reporting procedure?
Maintain damaging parts according to maintenance procedure
What is the purpose of a standardized, consistent format in developing records and documents?
To help staff learn quickly
What is the main purpose of evaluating the relevance, efficiency, effectiveness, impact, and sustainability of a project/program?
To cover most if not all evaluation indicators
What is the benefit of using bullet points and flow diagrams in developing records and documents?
It makes it easy to understand complex information
What is the importance of clarity in developing records and documents?
It makes it easy to understand complex information
What is the purpose of preparing reports?
To have no error or discrepancy
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
This quiz covers the uses and measurements of digital reading tape measures and Vernier Calipers, including their accuracy and applications.
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