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  4. ASVAB Section 3: Mechanical Comprehension

Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps
ASVAB Section Three : Mechanical Comprehension Questions 71–75 (page: 16)

Updated On: 9-Feb-2026
Page 16 of 39
PDF with 187 Questions

A gear and pinion have a ratio of 4 to 1.
If the gear makes 200 revolutions per minute, the speed of the pinion is ____________.

  1. 50 rpm
  2. 800 rpm
  3. 400 rpm
  4. 200 rpm

Answer(s): B

Explanation:

The pinion turns 4 times as often as the gear: 4 × 200 = 800.



The gas gauge in an auto relies on what mechanical device to measure the amount of gas in the tank?

  1. ball and cock
  2. automatic valve
  3. float
  4. mechanical switch

Answer(s): C

Explanation:

A float indicates the level of liquid in a container.



Using a runner gives you a mechanical advantage of __________.

  1. 4
  2. 2
  3. 3
  4. 1

Answer(s): B

Explanation:

Using a runner (a single, moveable pulley) gives a mechanical advantage of 2.



For the valve shown in the figure above to open once each second, the cam must revolve at a rate of
________________.

  1. 6 rpm
  2. 10 rpm
  3. 15 rpm
  4. 3 rpm

Answer(s): A

Explanation:

Because 60 seconds comprise a minute, the valve must open 60 times per minute. The cam will open the valve 10 times per revolution, so 60 ÷ 10 = 6.
The cam must make 6 revolutions per minute to raise the valve 60 times per minute.



The figure above represents a water tank. Which of the following statements is not true?

  1. If Valves 1 and 2 are open and Valves 3, 4, and 5 are closed, the tank will eventually overflow.
  2. If all valves are open, the water remains at a constant level as long as the rate of intake is equal to the rate of discharge.
  3. Water in the tank will rise if Valves 1 and 2 are open and Valves 3 and 4 are closed.
  4. The tank will empty entirely if Valves 1 and 2 are closed and Valves 4 and 5 are open.

Answer(s): D

Explanation:

Because Valve 4 is above the bottom of the tank, some water will remain in the tank below the level of the valve, so the tank will never be completely empty.



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