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ASVAB · Simple Machines (Levers, Pulleys, Gears)

A screw has 30 threads per inch. How far does it advance into a material when turned 3 full rotations?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

0.10 inches

  1. A 3 inches
  2. B 0.30 inches
  3. C 0.05 inches
  4. D 0.10 inches

Why this is the answer

Screw pitch: 30 threads per inch means each full rotation advances the screw 1/30 inch. 3 rotations × (1/30 inch per rotation) = 3/30 = 0.10 inches. The screw is a simple machine (inclined plane wrapped around a cylinder) that converts rotational force (torque) into linear force and motion. MORE THREADS PER INCH = finer pitch = more mechanical advantage per turn = less advance per turn. FEWER THREADS PER INCH = coarser pitch = less mechanical advantage = more advance per turn.

Source: ASVAB MC, Screw — Thread Advance

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About this topic: Simple Machines (Levers, Pulleys, Gears)

Simple machines — levers, pulleys, gears, inclined planes, wheel-and-axle, screws — are the heart of Mechanical Comprehension. Each question comes down to mechanical advantage: how much the machine multiplies force, and the trade-off in distance. This is one of 23 Mechanical Comprehension questions on simple machines (levers, pulleys, gears), each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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