ASVAB Mechanical Comprehension Practice Test 617423 Results

Your Results Global Average
Questions 5 5
Correct 0 3.86
Score 0% 77%

Review

1

Which of the following surfaces would have the lowest coefficient of friction?

85% Answer Correctly

leather

tile

concrete

ice
Solution

Coefficient of friction (μ) represents how much two materials resist sliding across each other.  Smooth surfaces like ice have low coefficients of friction while rough surfaces like concrete have high μ.

2 If you lift a 13 lbs. rock 48 ft. from the ground, how much work have you done?
71% Answer Correctly
624 ft⋅lb
0 ft⋅lb
61 ft⋅lb
None of these is correct
Solution
Work is force times distance. In this case, the force is the weight of the rock so:
\( W = F \times d \)
\( W = 13 \times 48 \)
\( W = 624 \)
3

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

74% Answer Correctly

non-uniformly distributed load

impact 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.

4

Tension is a force that does which of the following?

76% Answer Correctly

slows an object

compacts an object

heats up an object

stretches an object
Solution

Tension is a force that stretches or elongates something. When a cable or rope is used to pull an object, for example, it stretches internally as it accepts the weight that it's moving. Although tension is often treated as applying equally to all parts of a material, it's greater at the places where the material is under the most stress.

5 If input effort is 100 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 7?
79% Answer Correctly
175ft⋅lb
0ft⋅lb
2800ft⋅lb
700 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 7 will multiply an input effort of 100 ft⋅lb by 7 to produce an output effort of 700 ft⋅lb.