Mechanical Aptitude Mechanical Aptitude Tools 4 — Questions and Answers
Question 1: Which tool is used to measure the angle of a surface relative to a reference without using a protractor?
- Combination square
- Bevel gauge (sliding T-bevel) (Correct answer)
- Try square
- Speed square
Correct answer: Bevel gauge (sliding T-bevel)
A sliding T-bevel (bevel gauge) can be set to any angle from an existing surface and then transferred to another workpiece.
Question 2: When tightening a bolt with a torque wrench, you should:
- Pull the handle toward you in one smooth motion until the wrench clicks or deflects (Correct answer)
- Push and pull repeatedly until the bolt won't turn
- Apply force beyond the click to ensure full torque
- Use it to loosen bolts first, then re-tighten
Correct answer: Pull the handle toward you in one smooth motion until the wrench clicks or deflects
A click-type torque wrench signals the set torque with a click; further force over-torques the fastener.
Question 3: A feeler gauge set is most commonly used to measure:
- Thread pitch
- Shaft diameter
- Small clearances and gaps between parts (Correct answer)
- Hole depth
Correct answer: Small clearances and gaps between parts
Feeler gauges are thin metal strips of precise thickness used to measure narrow gaps such as spark plug gaps or valve clearances.
Question 4: What is the function of a drift punch compared to a center punch?
- Drift punches are used to align holes in mating parts, not to start drill holes (Correct answer)
- Drift punches have a pointed tip for marking
- Drift punches measure hole diameters
- Drift punches cut threads in soft metal
Correct answer: Drift punches are used to align holes in mating parts, not to start drill holes
A drift punch (aligning punch) has a tapered body used to align bolt holes in plates or flanges before inserting fasteners.
Question 5: Which hacksaw blade TPI (teeth per inch) is correct for cutting thin-wall steel tubing?
- 14 TPI
- 18 TPI
- 24 TPI
- 32 TPI (Correct answer)
Correct answer: 32 TPI
Thin-wall tubing requires a fine 32 TPI blade so at least two or three teeth are always engaged, preventing the blade from catching and stripping teeth.
Question 6: A strap wrench is preferred over a pipe wrench when working on:
- Rusted iron pipe
- Polished chrome plumbing fixtures or plastic pipe (Correct answer)
- Large diameter flanged fittings
- Cast-iron drain pipes
Correct answer: Polished chrome plumbing fixtures or plastic pipe
A strap wrench grips using a rubber or fabric strap that won't scratch or bite into polished or soft surfaces.
Question 7: What does a scratch awl do that a pencil cannot in layout work?
- Measures distances more accurately
- Scribes a fine, permanent line directly into metal or wood (Correct answer)
- Punches holes for fasteners
- Transfers measurements from a ruler
Correct answer: Scribes a fine, permanent line directly into metal or wood
A scratch awl scribes fine lines into hard surfaces that remain visible and won't rub off, unlike pencil marks.
Mechanical Aptitude Mechanical Aptitude Tools 4
Which tool is used to measure the angle of a surface relative to a reference without using a protractor?