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  4. ASVAB Section 3: Mechanical Comprehension

Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps
ASVAB Section Three : Mechanical Comprehension Questions 81–85 (page: 18)

Updated On: 9-Feb-2026
Page 18 of 39
PDF with 187 Questions

How can a gear system derive the greatest amount of mechanical advantage when a seven-tooth gear drives a ___________?

  1. 29-tooth gear
  2. 5-toothgear
  3. 24-tooth gear
  4. 17-tooth gear

Answer(s): A

Explanation:

The greater the difference between the number of teeth of the two meshed gears, the greater the torque or mechanical advantage.



An above-ground suburban water tank holds 540 gallons of water when full.
If the tank starts out full and is drained at a rate of 60 gallons per minute, how many seconds will it take to empty out halfway?

  1. 54
  2. 240
  3. 270
  4. 480

Answer(s): C

Explanation:

540 gallons divided by 60 gallons a minute means that it takes nine minutes to drain the tank completely. Half of that time is 4.5 minutes; 4.5 multiplied by 60 seconds equals 270 seconds.



Which of the following is not a simple machine?

  1. Lever
  2. Inclined plane
  3. Axe
  4. Pulley

Answer(s): C

Explanation:

An axe is a compound machine: the handle is a lever, and the head is two inclined planes (each side of the blade edge).



If you want to hammer in a heavy nail, it might be a good idea to use a hammer with a __________.

  1. lighter head
  2. heavy head
  3. longer handle
  4. shorter handle

Answer(s): C

Explanation:

A longer handle – a longer lever – allows the hammerhead to reach a higher speed, thereby producing more striking force.



If you drag a log across the road, one way to reduce the amount of force needed to pull it would be to
__________.

  1. use a thicker rope
  2. pull harder
  3. cross at an angle
  4. lubricate the road

Answer(s): D

Explanation:

If you drag a log across the road, one way to reduce the amount of force needed to pull it would be to lubricate the road.
Two things contribute to the force needed to pull the log across the road: the weight (mass) of the log itself, and the friction between the log and the road.
Lubricating the road will reduce the friction and therefore reduce the force needed to pull the log across the road.



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