ASVAB Mechanical Comprehension Practice Test 543939 Results

Your Results Global Average
Questions 5 5
Correct 0 2.67
Score 0% 53%

Review

1

Concurrent forces:

55% Answer Correctly

act in a common plane

act in a common dimension

act along the same line of action

pass through a common point
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.

2

Which of the following will increase the mechanical advantage of this inclined plane?

59% Answer Correctly

lower the force acting at the blue arrow

shorten the ramp

increase the force acting at the blue arrow

lengthen the ramp
Solution

The mechanical advantage (MA) of an inclined plane is the effort distance divided by the resistance distance. In order to increase mechanical advantage, this ratio must increase which means making the effort distance longer and this can be accomplished by lengthening the length of the ramp.

3

Which of the following represents how much two materials resist sliding across each other?

54% Answer Correctly

normal friction

kinetic friction

coefficient of friction

static friction
Solution

Coefficient of friction (μ) represents how much two materials resist sliding across each other.  Smooth surfaces like ice have low coefficients of friction while rough surfaces like concrete have high μ.

4

Two gears are connected and the smaller gear drives the larger gear. The speed of rotation will __________ and the torque will __________.

61% Answer Correctly

decrease, increase

decrease, decrease

increase, increase

increase, decrease
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.

5 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?
36% Answer Correctly
2
3
5
1
Solution

The mechanical advantage of a wheel and axle lies in the difference in radius between the inner (axle) wheel and the outer wheel. But, this mechanical advantage is only realized when the input effort and load are applied to different wheels. Applying both input effort and load to the same wheel results in a mechanical advantage of 1.