ASVAB Mechanical Comprehension Practice Test 946840 Results

	Your Results	Global Average
Questions	5	5
Correct	0	2.96
Score	0%	59%

Review

What type of load creates different stresses at different locations on a structure?

61% Answer Correctly

	impact load
	static uniformly distributed load
	non-uniformly distributed 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.

The mechanical advantage of a third class lever is always:

37% Answer Correctly

	greater than one
	less than one
	equal to one
	not equal to one

Solution

A third class lever is designed to multiply distance and speed at the expense of effort force. Because the effort force is greater than the resistance, the mechanical advantage of a third class lever is always less than one.

An example of a third class lever is a broom. The fulcrum is at your hand on the end of the broom, the effort force is your other hand in the middle, and the resistance is at the bottom bristles. The effort force of your hand in the middle multiplies the distance and speed of the bristles at the bottom but at the expense of producing a brushing force that's less than the force you're applying with your hand.

3 If input effort is 500 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 9?

79% Answer Correctly

	55ft⋅lb
	9000ft⋅lb
	2250ft⋅lb
	4500 ft⋅lb

Solution

Mechanical advantage is the ratio of output force to input force and tells us by how many times a machine multiplies input effort. So, a machine with a mechanical advantage of 9 will multiply an input effort of 500 ft⋅lb by 9 to produce an output effort of 4500 ft⋅lb.

What type of load is sudden and for a relatively short duration?

70% Answer Correctly

	concentrated load
	impact load
	non-uniformly distributed load
	dynamic load

Solution

A screw is most like which of the following other simple machines?

50% Answer Correctly

	inclined plane
	first-class lever
	block and tackle
	wheel and axle

Solution

A screw is an inclined plane wrapped in ridges (threads) around a cylinder. The distance between these ridges defines the pitch of the screw and this distance is how far the screw advances when it is turned once. The mechanical advantage of a screw is its circumference divided by the pitch.