ASVAB Mechanical Comprehension Practice Test 625750 Results

Your Results Global Average
Questions 5 5
Correct 0 2.77
Score 0% 55%

Review

1

The work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. This defines which of the following?

60% Answer Correctly

Pascal's law

conservation of mechanical energy

mechanical advantage

work-energy theorem
Solution

The work-energy theorem states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. Simply put, work imparts kinetic energy to the matter upon which the work is being done.

2

Depending on where you apply effort and resistance, the wheel and axle can multiply:

45% Answer Correctly

force or speed

force or distance

power or distance

speed or power
Solution

If you apply the resistance to the axle and the effort to the wheel, the wheel and axle will multiply force and if you apply the resistance to the wheel and the effort to the axle, it will multiply speed.

3 If A = 8 ft., B = 2 ft., C = 5 ft., the green box weighs 45 lbs. and the blue box weighs 60 lbs., what does the orange box have to weigh for this lever to balance?
44% Answer Correctly
0 lbs.
96 lbs.
48 lbs.
5 lbs.
Solution
In order for this lever to balance, the torque acting on each side of the fulrum must be equal. So, the torque produced by A must equal the torque produced by B and C. Torque is weight x distance from the fulcrum which means that the following must be true for the lever to balance:

fAdA = fBdB + fCdC

For this problem, this equation becomes:

45 lbs. x 8 ft. = 60 lbs. x 2 ft. + fC x 5 ft.

360 ft. lbs. = 120 ft. lbs. + fC x 5 ft.

fC = \( \frac{360 ft. lbs. - 120 ft. lbs.}{5 ft.} \) = \( \frac{240 ft. lbs.}{5 ft.} \) = 48 lbs.

4 If A = 1 ft. and the green box weighs 25 lbs. what is the torque acting on the A side of this lever?
75% Answer Correctly
100 ft⋅lb
0 ft⋅lb
25 ft⋅lb
75 ft⋅lb
Solution
For a lever, torque is weight x distance from the fulcrum which, in this case, is: 25 ft. x 1 lbs. = 25 ft⋅lb
5

Which of the following is not a type of structural load?

49% Answer Correctly

wind load

live load

occupancy load

dead load
Solution

Dead load is the weight of the building and materials, live load is additional weight due to occupancy or use, snow load is the weight of accumulated snow on a structure and wind load is the force of wind pressures against structure surfaces.