ASVAB Mechanical Comprehension Practice Test 392732 Results

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

Review

1

Which of the following is not a type of bridge?

74% Answer Correctly

cable

arch

truss

block
Solution

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

2

Sam can do 50 ft. lb. of work in 2 minutes and 5 seconds. What would Sam have to do to increase his power output?

64% Answer Correctly

do the work in 3 minutes

do the work in 2 minutes

do 25 ft. lb. of work in 2 minutes 5 seconds

do 100 ft. lb. of work in 4 minutes 12 seconds
Solution

Power is the rate of doing work or \(\frac{W}{t}\). To increase power, increase the work being done in the same amount of time or do the same amount of work in less time.

3 If the radius of the axle is 3 and the radius of the wheel is 8, what is the mechanical advantage of this wheel and axle configuration?
41% Answer Correctly
0.38
8
2.67
-5
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 3 and the output radius (where the resistance is being applied) is 8 for a mechanical advantage of \( \frac{3}{8} \) = 0.38

4 If input effort is 600 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 7?
79% Answer Correctly
2100ft⋅lb
4200 ft⋅lb
1050ft⋅lb
85ft⋅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 600 ft⋅lb by 7 to produce an output effort of 4200 ft⋅lb.
5

On Earth, acceleration due to gravity (g) is approximately __________. 

81% Answer Correctly

1 m/s2

9.8 m/s2

1 m/s

6.67 x 10-11 m/s2
Solution

Newton's Law of Univeral Gravitation defines the general formula for the attraction of gravity between two objects:  \(\vec{F_{g}} = { Gm_{1}m_{2} \over r^2}\) . In the specific case of an object falling toward Earth, the acceleration due to gravity (g) is approximately 9.8 m/s2.