ASVAB Mechanical Comprehension Practice Test 123847 Results

Your Results Global Average
Questions 5 5
Correct 0 3.45
Score 0% 69%

Review

1 If input effort is 800 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 7?
79% Answer Correctly
2800ft⋅lb
114ft⋅lb
11200ft⋅lb
5600 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 800 ft⋅lb by 7 to produce an output effort of 5600 ft⋅lb.
2

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

50% Answer Correctly

first-class lever

wheel and axle

inclined plane

block and tackle
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.

3

Collinear forces:

72% Answer Correctly

act along the same line of action

act in a common plane

pass through a common point

are unrelated to each other
Solution

Collinear forces act along the same line of action, concurrent forces pass through a common point and coplanar forces act in a common plane.

4

Potential energy is energy that has the potential to be converted into what?

80% Answer Correctly

heat

power

work

 kinetic energy
Solution

Potential energy is the energy of an object by virtue of its position relative to other objects. It is energy that has the potential to be converted into kinetic energy.

5

Connected gears of different numbers of teeth are used together to change which of the following charasteristics of the input force?

65% Answer Correctly

rotational direction

energy

force

torque
Solution

Connected gears of different numbers of teeth are used together to change the rotational speed and torque of the input force. If the smaller gear drives the larger gear, the speed of rotation will be reduced and the torque will increase. If the larger gear drives the smaller gear, the speed of rotation will increase and the torque will be reduced.