ASVAB Mechanical Comprehension Practice Test 841545 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.10
Score	0%	62%

Review

A wedge converts force applied to its blunt end into force __________ its inclined surface.

57% Answer Correctly

	perpendicular to
	parallel to
	along
	opposite to

Solution

The wedge is a moving inclined plane that is used to lift, hold, or break apart an object. A wedge converts force applied to its blunt end into force perpendicular to its inclined surface. In contrast to a stationary plane where force is applied to the object being moved, with a wedge the object is stationary and the force is being applied to the plane. Examples of a wedge include knives and chisels.

The mass of an object correlates to the size of the object but ultimately depends on:

66% Answer Correctly

	gravity
	the object's weight
	the object's potential energy
	the object's density

Solution

Mass is a measure of the amount of matter in an object. In general, larger objects have larger mass than smaller objects but mass ultimately depends on how compact (dense) a substance is.

3 If the green arrow in this diagram represents 200 ft⋅lb of work, how far will the box move if it weighs 50 pounds?

72% Answer Correctly

	200 ft.
	4 ft.
	16 ft.
	12 ft.

Solution

The Law of Work states that the work put into a machine is equal to the work received from the machine under ideal conditions. In equation form, that's:

W_in = W_out
F_effort x d_effort = F_resistance x d_resistance

In this problem, the effort work is 200 ft⋅lb and the resistance force is 50 lbs. and we need to calculate the resistance distance:

W_in = F_resistance x d_resistance
200 ft⋅lb = 50 lbs. x d_resistance
d_resistance = \( \frac{200ft⋅lb}{50 lbs.} \) = 4 ft.

4 How much work can a 1 hp engine do in 2 seconds?

52% Answer Correctly

	0 ft⋅lb
	4 ft⋅lb
	1100 ft⋅lb
	2 ft⋅lb

Solution

Horsepower (hp) is a common measure of power output for complex machines. By definition, a 1 hp machine does 550 ft⋅lb of work in 1 second: 1 hp = 550 ft⋅lb/s. Substituting the variables for this problem gives us:
\( W = 1 hp \times 550 \frac{ft⋅lb}{s} \times 2s = 1100 ft⋅lb \)

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

61% Answer Correctly

	low corrosive action
	chemically stable
	high melting point
	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.