ASVAB ASVAB Mechanical Comprehension Principles 4

Question 1

A hydraulic jack has an input piston with area 2 sq in and an output piston with area 20 sq in. If you apply 50 lbs of force to the input, what force is produced at the output?

Accepted Answer

500 lbs

Answer

Pascal's law: output force = input force × (output area / input area) = 50 × (20/2) = 500 lbs.

Question 2

Which type of gear arrangement reverses the direction of rotation between the driver and driven gear?

Accepted Answer

Spur gear pair (external)

Answer

Two external spur gears meshed together rotate in opposite directions.

Question 3

A steel beam is supported at both ends and loaded in the center. Where does the maximum bending stress occur?

Accepted Answer

At the center top and bottom surfaces

Answer

Maximum bending stress occurs at the outermost fibers (top and bottom) at the point of maximum bending moment.

Question 4

A flywheel is used in an engine primarily to:

Accepted Answer

Store rotational energy and smooth out power pulses

Answer

A flywheel's rotational inertia stores energy during power strokes and releases it during non-power strokes, smoothing engine output.

Question 5

If a 10-foot ladder leans against a wall with its base 6 feet from the wall, how high up the wall does it reach?

Accepted Answer

8 feet

Answer

Using the Pythagorean theorem: height = √(10² - 6²) = √(100-36) = √64 = 8 feet.

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB ASVAB Mechanical Comprehension Principles 4