ASVAB Mechanical Comprehension Practice Test 509554 Results

	Your Results	Global Average
Questions	5	5
Correct	0	2.79
Score	0%	56%

Review

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

57% Answer Correctly

	opposite to
	along
	parallel to
	perpendicular 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.

2 How much work can a 5 hp engine do in 4 seconds?

52% Answer Correctly

	0 ft⋅lb
	10 ft⋅lb
	20 ft⋅lb
	11000 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:
\( W = 5 hp \times 550 \frac{ft⋅lb}{s} \times 4s = 11000 ft⋅lb \)

Specific gravity is a comparison of the density of an object with the density of:

57% Answer Correctly

	carbon
	water
	air
	oil

Solution

Specific gravity is the ratio of the density of equal volumes of a substance and water and is measured by a hyrdometer.

Assuming force applied remains constant, which of the following will result in more work being done?

53% Answer Correctly

	increasing the coefficient of friction
	moving the object farther
	moving the object with more speed
	moving the object with more acceleration

Solution

Work is accomplished when force is applied to an object: W = Fd where F is force in newtons (N) and d is distance in meters (m). Thus, the more force that must be applied to move an object, the more work is done and the farther an object is moved by exerting force, the more work is done.

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

61% Answer Correctly

	high melting point
	chemically stable
	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.