ASVAB Mechanical Comprehension Practice Test 633145 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.37
Score	0%	67%

Review

What type of load acts on a relatively small area of a structure?

75% Answer Correctly

	impact load
	non-uniformly distributed load
	concentrated load
	dynamic 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.

A wedge is most similar to what other type of simple machine?

70% Answer Correctly

	second-class lever
	first-class lever
	third-class lever
	inclined plane

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.

3 How much work can a 1 hp engine do in 8 seconds?

52% Answer Correctly

	2 ft⋅lb
	4 ft⋅lb
	8 ft⋅lb
	4400 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:
\( W = 1 hp \times 550 \frac{ft⋅lb}{s} \times 8s = 4400 ft⋅lb \)

Which of the following will increase the mechanical advantage of this inclined plane?

58% Answer Correctly

	increase the force acting at the blue arrow
	lower the force acting at the blue arrow
	shorten the ramp
	lengthen the ramp

Solution

The mechanical advantage (MA) of an inclined plane is the effort distance divided by the resistance distance. In order to increase mechanical advantage, this ratio must increase which means making the effort distance longer and this can be accomplished by lengthening the length of the ramp.

5 60 lbs. of effort is used by a machine to lift a 180 lbs. box. What is the mechanical advantage of the machine?

84% Answer Correctly

	5
	3.3
	2.7
	3

Solution

Mechanical advantage is resistance force divided by effort force:

MA = \( \frac{F_r}{F_e} \) = \( \frac{180 lbs.}{60 lbs.} \) = 3