ASVAB Mechanical Comprehension Test 2

Question 1

If a lever has its fulcrum positioned 1 foot from a 100-pound load and 3 feet from the effort force, how much effort is required to lift the load?

Accepted Answer

33.3 pounds

Answer

Using the lever principle (Load × Load Distance = Effort × Effort Distance): 100 × 1 = Effort × 3, so Effort = 100/3 ≈ 33.3 pounds.

Question 2

Two gears are meshed together. Gear A has 20 teeth and Gear B has 40 teeth. If Gear A rotates at 100 RPM, at what speed does Gear B rotate?

Accepted Answer

50 RPM

Answer

When two gears mesh, the gear with more teeth rotates more slowly. Speed ratio = Teeth of A / Teeth of B = 20/40 = 1/2. So Gear B rotates at 100 × (1/2) = 50 RPM.

Question 3

A pulley system uses 4 supporting rope segments to lift a load. If the load weighs 200 pounds, how much effort force is required (ignoring friction)?

Accepted Answer

50 pounds

Answer

In a pulley system, the mechanical advantage equals the number of supporting rope segments. With 4 segments supporting the load, the effort required = 200 ÷ 4 = 50 pounds.

Question 4

Water pressure at the bottom of a container depends on which of the following?

Accepted Answer

The depth of the water

Answer

Fluid pressure depends only on the depth of the fluid and its density, not on the container's shape or total volume. Pressure increases with depth according to P = ρgh.

Question 5

A bolt has 16 threads per inch. If you turn it 4 complete revolutions, how far does it advance?

Accepted Answer

0.25 inches

Answer

The pitch of the bolt is 1/16 inch per revolution. Over 4 revolutions: 4 × (1/16) = 4/16 = 0.25 inches advance.

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB Mechanical Comprehension Test 2