ASVAB Mechanical Comprehension Practice Test 733151 Results

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

Review

1 How much work can a 8 hp engine do in 4 seconds?
52% Answer Correctly
4 ft⋅lb
16 ft⋅lb
0 ft⋅lb
17600 ft⋅lb
Solution
Horsepower (hp) is a common measure of power output for complex machines. By definition, a 1 hp machine does 550 ft⋅lb of work in 1 second: 1 hp = 550 ft⋅lb/s. Substituting the variables for this problem gives us:
\( W = 8 hp \times 550 \frac{ft⋅lb}{s} \times 4s = 17600 ft⋅lb \)
2

Which of the following is the formula for gravitational potential energy?

61% Answer Correctly

\(PE = mgh\)

\(PE = { 1 \over 2} mg^2\)

\(PE = { 1 \over 2} mv^2\)

\(PE = mg^2h\)
Solution

Gravitational potential energy is energy by virtue of gravity. The higher an object is raised above a surface the greater the distance it must fall to reach that surface and the more velocity it will build as it falls. For gravitational potential energy, PE = mgh where m is mass (kilograms), h is height (meters), and g is acceleration due to gravity which is a constant (9.8 m/s2).

3

Which of the following is not a type of bridge?

74% Answer Correctly

cable

block

arch

truss
Solution

The six basic bridge forms are beam, truss, arch, cantilever, cable, and suspension.

4

Which of these is the formula for force?

77% Answer Correctly

F = a/m

F = m/a

F = am2

F = ma
Solution

Newton's Second Law of Motion states that "The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object." This Law describes the linear relationship between mass and acceleration when it comes to force and leads to the formula F = ma or force equals mass multiplied by rate of acceleration.

5

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.