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  5. ASVAB Section 3: Mechanical Comprehension

Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps (page: 18)

Page 18 of 47
PDF with 187 Questions

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.



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.



Page 18 of 47



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