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  4. ASVAB Section 3: Mechanical Comprehension

Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps
ASVAB Section Three : Mechanical Comprehension Questions 46–50 (page: 11)

Updated On: 9-Feb-2026
Page 11 of 39
PDF with 187 Questions

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

  1. Gear 2 makes 10 complete clockwise revolutions per minute.
  2. Gear 2 makes 20 complete counterclockwise revolutions per minute.
  3. Gear 2 makes 5 complete counterclockwise revolutions per minute.
  4. Gear 3 keeps Gear 2 from making any revolutions.

Answer(s): B

Explanation:

If Gear 1 turns at 10 rpm, then Gear 2, which is half the size, turns twice as fast at a rate of 20 rpm.



For the fuel to travel from Reservoir A to Reservoir B, passing through Filters C and D on the way, which valves must be open?

  1. 1, 2, 4, and 8
  2. 1, 2, and 3
  3. 6, 7, and 8
  4. 4, 6, and 7

Answer(s): A

Explanation:

Opening Valves 1, 2, 4, and 8 allows the fuel to travel through the filters. Opening Valves 1, 2, and 3 doesn’t allow the fuel to travel through the filters. Opening Valves 6, 7, and 9 doesn’t allow the fuel to travel through the filters.
Opening Valves 4, 6, and 7 will allow fuel to travel through the filters but not to Reservoir B.



A yellow flame on a gas furnace indicates _______________.

  1. Everything is fine.
  2. The fuel-air mixture is too rich.
  3. The fuel-air mixture is too lean.
  4. The gas pressure is too low.

Answer(s): B

Explanation:

A yellow flame indicates too much fuel or not enough air. More air should be allowed to enter and mix with the gas. Thus, the fuel-air mixture is too rich.



If a water tank on a toilet keeps overflowing, the problem is probably a __________.

  1. defective float
  2. clogged pipe
  3. crimped chain
  4. improper seal

Answer(s): A

Explanation:

The float measures the water level in the tank. If the tank overflows, the float is probably defective.



In the figure shown above, the board holds the weight of the cat. The board is placed on two identical scales. Each scale reads ______________.

  1. 24
  2. 10
  3. 12
  4. 40

Answer(s): C

Explanation:

The 20-pound cat and the 4-pound board weigh 24 pounds total or, divided by 2, 12 pounds per scale.



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