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  4. ASVAB Section 3: Mechanical Comprehension

Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps
ASVAB Section Three : Mechanical Comprehension Questions 66–70 (page: 15)

Updated On: 9-Feb-2026
Page 15 of 39
PDF with 187 Questions

The steel plate above is held in place by different machine screws, each indicated by different symbols. How many different types of machine screws have been used?

  1. 6
  2. 15
  3. 5
  4. 9

Answer(s): A

Explanation:

There are 6 different symbols, so 6 different types of machine screws were used.



The amount of force (F) needed to balance the lever in the figure above is most nearly __________.

  1. 15 pounds
  2. 13 pounds
  3. 7.5 pounds
  4. 20 pounds

Answer(s): B

Explanation:

To determine the amount of force exerted by the cats, first multiply the length of the resistance arm (as it applies to the cat) by the weight of each cat and add the products together.
The 10-pound cat is supported by the entire weight of the resistance arm, so 5 × 10 = 50. The 5-pound cat is being supported by 3 feet of the resistance arm, so 3 × 5 = 15.
Add them up: 50 + 15 = 65.
This number is equal to the length of the resistance arm times effort (force) or 65 = 5F. To isolate F, divide both sides by 5: 65 ÷ 5 = 5F ÷ 5 or 13 = F.



With one complete revolution of the cable winch shown above, the load will move ____________.

  1. 12 inches
  2. 6 inches
  3. 24 inches
  4. 36 inches

Answer(s): C

Explanation:

One revolution of the winch will move the weight 24 inches, the circumference of the winch drum.



In the figure above, assume the valves are all closed. Which valves need to be open to fill the tank entirely?

  1. 1 and 2 only
  2. 1 only
  3. 1, 2, and 3
  4. 2 only

Answer(s): A

Explanation:

Valves 1 and 2 need to be open to fill the tank.



If Gear 1 in the figure above makes 10 complete clockwise revolutions per minute, then___________.

  1. Gear 2 makes 2 clockwise revolutions per minute.
  2. Gear 3 makes 8 clockwise revolutions per minute.
  3. Gear 3 makes 30 clockwise revolutions per minute.
  4. Gear 3 makes 9 counterclockwise revolutions per minute.

Answer(s): B

Explanation:

Gear 1 makes 10 clockwise revolutions per minute.
Gear 2, which is half the size, makes 20 counterclockwise revolutions per minute. (The number of revolutions it makes is inversely proportional to its difference in size.)
Gear 2 is half the size of Gear 1, so to determine the number of revolutions it makes, multiply the number of revolutions Gear 1 makes by the inverse of 1⁄2: 10 × 2⁄1 (or just 2) = 20.
Gear 3 is 2.5 times the size of Gear 2. In other words, it is 5⁄2 the size of Gear 2.
To determine the number of revolutions Gear 3 makes, multiply the inverse of 5⁄2 by the number of revolutions Gear 2 makes: 2⁄5 × 20.
This can be stated as 20⁄1 (the number of revolutions Gear 2 makes per minute) × 2⁄5 (the fraction of revolutions Gear 3 makes) = 40⁄5 or 8 revolutions per minute.



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