ASVAB Mechanical Comprehension Practice Test 331902 Results

Your Results Global Average
Questions 5 5
Correct 0 3.14
Score 0% 63%

Review

1

The science that deals with motion and the forces that produce motion is called which of the following?

57% Answer Correctly

physics

aeronautics

mechanics

engineering
Solution

Mechanics deals with motion and the forces that produce motion.

2

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

53% Answer Correctly

moving the object with more acceleration

moving the object farther

increasing the coefficient of friction

moving the object with more speed
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.

3

Tension is a force that does which of the following?

75% Answer Correctly

slows an object

stretches an object

heats up an object

compacts 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.

4 If input effort is 900 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 8?
79% Answer Correctly
3600ft⋅lb
1800ft⋅lb
7200 ft⋅lb
0ft⋅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 8 will multiply an input effort of 900 ft⋅lb by 8 to produce an output effort of 7200 ft⋅lb.
5 If the radius of the axle is 3 and the radius of the wheel is 4, what is the mechanical advantage of this wheel and axle configuration?
52% Answer Correctly
3
1.33
0.75
4
Solution

The mechanical advantage of a wheel and axle is the input radius divided by the output radius:

MA = \( \frac{r_i}{r_o} \)

In this case, the input radius (where the effort force is being applied) is 4 and the output radius (where the resistance is being applied) is 3 for a mechanical advantage of \( \frac{4}{3} \) = 1.33