ASVAB Mechanical Comprehension Practice Test 425782 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.06
Score	0%	61%

Review

Which of the following is not a characteristic of a ceramic?

61% Answer Correctly

	chemically stable
	high melting point
	low corrosive action
	low density

Solution

Ceramics are mixtures of metallic and nonmetallic elements that withstand exteme thermal, chemical, and pressure environments. They have a high melting point, low corrosive action, and are chemically stable. Examples include rock, sand, clay, glass, brick, and porcelain.

Drag is a type of:

82% Answer Correctly

	potential energy
	work
	kinetic energy
	friction

Solution

Drag is friction that opposes movement through a fluid like liquid or air. The amount of drag depends on the shape and speed of the object with slower objects experiencing less drag than faster objects and more aerodynamic objects experiencing less drag than those with a large leading surface area.

3 A = 5 ft., the green box weighs 35 lbs., and the blue box weighs 60 lbs. What does distance B need to be for this lever to balance?

65% Answer Correctly

	300 ft.
	0 ft.
	2.92 ft.
	1.46 ft.

Solution

In order for this lever to balance, the torque acting on side A must equal the torque acting on side B. Torque is weight x distance from the fulcrum which means that the following must be true for the lever to balance:

f_Ad_A = f_Bd_B

For this problem, the equation becomes:

35 lbs. x 5 ft. = 60 lbs. x d_B

d_B = \( \frac{35 \times 5 ft⋅lb}{60 lbs.} \) = \( \frac{175 ft⋅lb}{60 lbs.} \) = 2.92 ft.

The advantage of using a third-class lever is that it increases:

37% Answer Correctly

	the force applied to the load
	the distance traveled by the load
	the mechanical advantage of the lever
	the speed of the load

Solution

A third-class lever is used to increase distance traveled by an object in the same direction as the force applied. The fulcrum is at one end of the lever, the object at the other, and the force is applied between them. This lever does not impart a mechanical advantage as the effort force must be greater than the load but does impart extra speed to the load. Examples of third-class levers are shovels and tweezers.

What type of load doesn't create specific stress points or vary with time?

60% Answer Correctly

	impact load
	concentrated load
	static uniformly distributed load
	non-uniformly distributed load

Solution

A concentrated load acts on a relatively small area of a structure, a static uniformly distributed load doesn't create specific stress points or vary with time, a dynamic load varies with time or affects a structure that experiences a high degree of movement, an impact load is sudden and for a relatively short duration and a non-uniformly distributed load creates different stresses at different locations on a structure.