QCM : Workshop Hand Tools and Measurement — 24 questions

Questions et réponses du QCM

1. What does marking out primarily achieve on a workpiece?

It is the machining operation that shapes the part
It guides subsequent machine setup and machining by indicating outlines and hole/slot positions
It finishes the surface to final dimensions
It removes metal to create the required profile directly

It guides subsequent machine setup and machining by indicating outlines and hole/slot positions

Explication

Marking out scratches lines to show the outline and the position of holes/slots and to guide machine setup. It is not the machining operation itself.

2. Which description best matches a datum in marking out?

A datum is the final measured dimension after machining
A datum is a random spot on the surface with no measurement link
A datum is a reference edge, point, or centre line from which dimensions are taken
A datum is any cutting tool used to machine features

A datum is a reference edge, point, or centre line from which dimensions are taken

Explication

A datum is a reference point, edge, or centre line used to take all measurements from. It is a reference position, not necessarily only a physical point.

3. How should a scriber point be maintained to produce clear lines on metal?

Sharpen only after every line to avoid uneven wear
Use a blunt point to leave a wider, easier-to-see mark
Keep the point slightly rounded to reduce scratches
Keep the point sharp so the lines are well defined

Keep the point sharp so the lines are well defined

Explication

A scriber is used to mark lines, and its point must remain sharp to produce well-defined lines. A rounded or blunt point would tend to worsen line definition.

4. In marking out, what is a divider mainly used for?

Marking straight parallel lines like a straightedge
Making centre punch marks for holes
Scribing circles/arcs and marking a series of lengths such as hole centres
Measuring dimensions with a scale reading

Scribing circles/arcs and marking a series of lengths such as hole centres

Explication

A divider is used to scribe circles or arcs and to mark series lengths such as hole centres. It is not primarily a measuring scale.

5. Which set correctly pairs punch type with its point angle and intended use?

Centre punch 90° for wide shallow marks, dot punch 60° for witness marks, prick punch 30° for light positioning marks
Centre punch 90° for measuring distances, dot punch 60° for scribing arcs, prick punch 30° for tangential profiles
Centre punch 30° for light marks, dot punch 60° for deep holes, prick punch 90° for wide marks
Centre punch 60° for witness marks, dot punch 90° for wide shallow marks, prick punch 30° for deep holes

Centre punch 90° for wide shallow marks, dot punch 60° for witness marks, prick punch 30° for light positioning marks

Explication

The punch angles and uses differ: centre punch (90°) for wide shallow location marks, dot punch (60°) for witness marks, and prick punch (30°) for light positioning.

6. Which sequence matches a typical plate marking-out order described for locating holes and the profile?

First mark tangential lines with a divider, then determine radii by measuring from the ends, then add centre dots
First find and scribe the centre line and centre-dot the intersection, then scribe arcs for hole centres/radii, then scribe tangential profile lines
First centre-punch all holes, then set the dividers to radii, then scribe the centre line last
First scribe the tangential profile, then scribe arcs for hole centres, then find the centre line

First find and scribe the centre line and centre-dot the intersection, then scribe arcs for hole centres/radii, then scribe tangential profile lines

Explication

The described procedure is: scribe the centre line and centre-dot the intersection, use dividers for arcs for hole centres/radii, then scribe the tangential profile lines with a precision steel rule.

7. How is the centre of a small radius located when using the end measurement method described?

Measure from one end a distance equal to the radius only
Measure from the centre of the radius to the end by radius minus 1 mm
Measure from one end a distance equal to the radius plus 1 mm
Measure from one end the diameter of the radius plus 1 mm

Measure from one end a distance equal to the radius plus 1 mm

Explication

The centre of the small radius is found by measuring from one end a distance equal to the radius plus 1 mm to allow for extra material at the end.

8. What is a scribing block primarily used for?

Scribing lines parallel to a datum surface and setting jobs by height and parallelism
Hollowing out material to remove large waste quantities
Cutting metal to produce the final size and finish
Measuring the exact thickness of metal stock with a scale

Scribing lines parallel to a datum surface and setting jobs by height and parallelism

Explication

A scribing block is a testing tool used to scribe and check/set work relative to a datum, including parallelism and concentricity tasks. It is not intended for cutting metal to final size.

9. Which distinction best describes the two forms of scribing block used for testing and marking?

A hand file and a machine file
A centre punch and a drill bit
A scriber and a caliper
A fixed scribing block and a universal scribing block

A fixed scribing block and a universal scribing block

Explication

The two forms are identified as a fixed scribing block and a universal scribing block. The other options are different tool types, not forms of scribing block.

10. Why is a hacksaw used before filing on metal workpieces?

To provide the final finished surface directly without further work
To check parallelism and set job height like a scribing tool
To cut metal and remove large amounts of waste before filing final size and surface
To sharpen the file teeth so they cut more effectively

To cut metal and remove large amounts of waste before filing final size and surface

Explication

A hacksaw cuts metal and removes larger waste so the file can then produce the final size and surface. Filing is for final sizing and finishing rather than the initial heavy cut.

11. What are the typical dimensions of the standard hacksaw blade?

300 mm long, 13 mm wide, and 0.65 mm thick
200 mm long, 10 mm wide, and 0.35 mm thick
450 mm long, 25 mm wide, and 2.0 mm thick
150 mm long, 6 mm wide, and 1.5 mm thick

300 mm long, 13 mm wide, and 0.65 mm thick

Explication

The standard hacksaw blade is given as 300 mm long, 13 mm wide, and 0.65 mm thick. The other options use incorrect dimensions.

12. A hacksaw blade tooth pitch should be chosen with what consideration(s)?

The intended surface finish quality, rather than the cutting action
Only the thickness of the metal sheet, not the hardness or section type
The material hardness and whether the cut is through a thick or thin section, considering pitch and blade material
The file type that will be used afterward, rather than the hacksaw blade

The material hardness and whether the cut is through a thick or thin section, considering pitch and blade material

Explication

Blade selection depends on material hardness and whether the section is thick or thin, with attention to pitch and blade material. The other choices ignore the stated selection criteria.

13. How do single-cut and double-cut files differ?

They differ in whether the file is used for cutting only metal or also wood
They differ in tooth arrangement across the file face
They differ in whether a handle is optional
They differ in the overall shape of the file body

They differ in tooth arrangement across the file face

Explication

Single-cut and double-cut describe the arrangement of teeth across the file face. Shape of the file is not what this distinction refers to.

14. Which hammer description matches a straight-peen hammer’s action?

It has a hemispherical peen for upsetting or riveting
It is made of soft materials to protect finishes
It spreads or draws metal in line with the handle
It spreads or draws metal at right angles to the handle

It spreads or draws metal in line with the handle

Explication

A straight-peen hammer has its peen arranged to spread or draw metal in line with the handle. The cross-peen option describes the right-angle action instead.

15. What is the main purpose of a soft hammer?

To scribe lines parallel to a datum surface
To position workpieces without damaging their finish
To provide the hardest striking force for cutting metal
To chip and cut metal like a chisel

To position workpieces without damaging their finish

Explication

A soft hammer uses materials such as lead, copper, wood, plastic, etc., to position work without damaging the finish. Harder cutting or chiseling functions belong to other tools and purposes.

16. What is a key requirement for chisel safety during use?

Hold the chisel with the blade facing directly toward the body
Do not inspect the handle as long as the cutting edge looks sharp
Inspect the blade and handle, reject a mushroomed impact head, and point the blade away from the body
Use the chisel only with a damaged mushroomed head to prevent slipping

Inspect the blade and handle, reject a mushroomed impact head, and point the blade away from the body

Explication

Chisel safety specifically includes inspecting the blade and handle, rejecting a mushroomed impact head, and pointing the blade away from the body. The distractors contradict these safety rules.

17. Tapping refers to which manufacturing operation?

Cutting an internal thread
Cutting an external thread
Reaming a drilled hole
Threading a shaft using a die

Cutting an internal thread

Explication

Tapping is the operation of cutting an internal thread, producing an internal thread. Dies are used for external threads, so that is the wrong operation type.

18. Which tap is designed with a very short lead and is used for bottoming (plug) work?

Taper or first tap
Second or intermediate tap
Adjustable split die
Bottoming or plug tap

Bottoming or plug tap

Explication

A bottoming or plug tap has a very short lead. By contrast, the taper/first tap and intermediate taps have longer leads.

19. For a metric tap, which expression gives the tap drill size in millimetres?

TDS = major diameter + pitch
TDS = major diameter − pitch
TDS = major diameter ÷ pitch
TDS = pitch − major diameter

TDS = major diameter − pitch

Explication

The metric tap drill size is given by TDS = major diameter − pitch (in millimetres). The other options use incorrect operations that do not match the stated relationship.

20. For an inch tap with major diameter D and TPI N, what is the tap drill size formula?

TDS = major diameter + 1/N
TDS = major diameter − 1/N
TDS = major diameter × 1/N
TDS = 1/(major diameter × N)

TDS = major diameter − 1/N

Explication

For an inch tap, the tap drill size is TDS = major diameter − 1/N. Adding or multiplying 1/N does not match the given formula.

21. How do external and internal calipers differ in what they measure?

External calipers measure inside dimensions; internal calipers measure outside dimensions
External calipers measure outside dimensions; internal calipers measure inside dimensions
Both external and internal calipers measure outside dimensions only
Both external and internal calipers measure inside dimensions only

External calipers measure outside dimensions; internal calipers measure inside dimensions

Explication

External calipers are used for outside dimensions, while internal calipers are used for inside dimensions. A common confusion is mixing up the measurement locations, which this question corrects.

22. What is the main purpose of the ratchet when reading a micrometer?

To lock the sleeve scale so it cannot move
To convert the thimble reading into millimetres
To increase the frame size for different objects
To provide the final measuring pressure until it clicks

To provide the final measuring pressure until it clicks

Explication

The ratchet is turned until it clicks, providing the correct measuring pressure. The other options describe functions that are not part of the stated micrometer reading procedure.

23. In micrometer readings, how is the final value calculated from the sleeve and thimble readings?

Reading = thimble-scale reading + sleeve-scale reading
Reading = sleeve-scale reading − (thimble-scale reading × least count)
Reading = sleeve-scale reading + (thimble-scale reading × least count)
Reading = (sleeve-scale reading × thimble-scale reading) ÷ least count

Reading = sleeve-scale reading + (thimble-scale reading × least count)

Explication

Micrometer reading equals the sleeve-scale reading plus the thimble-scale reading multiplied by the least count. The distractors use subtraction, wrong combination, or an incorrect mathematical structure.

24. For a micrometer, a common least count is used in the reading; for a vernier caliper, how is least count determined by the given difference?

Least count = 0.1 cm ÷ 0.09 cm
Least count = 0.1 cm − 0.09 cm = 0.01 cm
Least count = 0.09 cm − 0.1 cm = −0.01 cm
Least count = 0.1 cm + 0.09 cm = 0.19 cm

Least count = 0.1 cm − 0.09 cm = 0.01 cm

Explication

The least count is computed as 0.1 cm minus 0.09 cm, which equals 0.01 cm. Using addition or division contradicts the stated subtraction-based difference.

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What is marking out in machining?

Scratching lines on a workpiece surface to indicate outlines or positions.

What is a datum in measurement?

A reference point, edge, or centre line for all dimensions.

How many datums are needed to position a point on a plane surface?

Two datums are required.

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