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  5. ASVAB Section 3: Mechanical Comprehension

Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps (page: 21)

Page 20 of 47
PDF with 187 Questions

The lift caused by an aircraft's wings is primarily due to ____________.

  1. a decrease in pressure on the upper side of the wing (A)
  2. a decrease in pressure on the bottom side of the wing B
  3. a vacuum created under the wing at point B
  4. an increase in pressure on the upper side of the wing (A)

Answer(s): A

Explanation:

When oncoming air meets the leading edge of the airfoil (wing), some of it goes over the top of the airfoil and some of it flows underneath.
The air flowing over the top of the wing has to go further than the air underneath, because it must join together again with the air that flowed under the wing at the far (back) side of the wing – physical laws act together to prevent or minimize vacuums in most cases.



Pliers are an example of a _______________.

  1. first-class lever
  2. second-class lever
  3. third-class lever
  4. fourth-class lever

Answer(s): A

Explanation:

Pliers are an example of a first-class lever because the fulcrum is positioned between the effort (where your hand grips the pliers) and the load (the object that is being held or squeezed by the pliers).



The wheels below are connected by a belt as shown.
If the larger wheel makes two revolutions, how many revolutions will the smaller wheel make?


  1. Less than one
  2. One
  3. Two
  4. More than two

Answer(s): D

Explanation:

We are not told the sizes of the two wheels, but we can see that one is larger than the other.
If the two wheels are connected by a belt, the small wheel will be forced to turn fester and complete more turns than the larger wheel.



In the diagram in question 4, if the wheel on the left turns clockwise, which way will the wheel on the right turn?

  1. Clockwise
  2. Counterclockwise
  3. Counter-counterclockwise
  4. Unable to tell from the information given

Answer(s): B

Explanation:

If the wheel on the left turns clockwise, the wheel on the right will turn counterclockwise.






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