WTMA Common Tools and Fasteners 4

Question 1

What distinguishes a machine screw from a wood screw?

Accepted Answer

Machine screws have uniform threads designed to mate with nuts or tapped holes

Answer

Machine screws have uniform (non-tapered) threads designed to thread into nuts or pre-tapped metal holes, unlike wood screws which have tapered shanks for wood.

Question 2

Which wrench type is least likely to damage a soft or rounded fastener head?

Accepted Answer

Box-end (ring) wrench

Answer

A box-end wrench surrounds all six sides of the hex fastener, distributing force evenly and reducing the chance of rounding the corners.

Question 3

What is a 'UNC' thread designation in the US fastener system?

Accepted Answer

Unified National Coarse thread

Answer

UNC stands for Unified National Coarse, a standard thread series with fewer threads per inch than UNF (fine) threads.

Question 4

A snap ring (circlip) is used in an assembly. What is its function?

Accepted Answer

Retain a component on a shaft or in a bore

Answer

Snap rings (circlips) seat in grooves on shafts or in bores to axially retain components like bearings, gears, or pins.

Question 5

Which tool is used to apply a precise, measured amount of torque to a fastener?

Accepted Answer

Torque wrench

Answer

A torque wrench is calibrated to apply and measure a specific torque (twisting force) to ensure proper fastener tension.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test

WTMA - Wiesen Test of Mechanical Aptitude Practice Test

WTMA Common Tools and Fasteners 4