ASVAB Mechanical Comprehension Practice Test 578262 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.41
Score	0%	68%

Review

Boyle's law defines the relationship between pressure and volume as:

58% Answer Correctly

	\(\frac{P_1}{P_2} = {V_1}{V_2}\)
	\(\frac{P_1}{P_2} = \frac{V_2}{V_1}\)
	\(\frac{P_1}{P_2} = \frac{V_1}{V_2}\)
	\({P_1}{P_2} = {V_1}{V_2}\)

Solution

Boyle's law states that "for a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional". Expressed as a formula, that's \(\frac{P_1}{P_2} = \frac{V_2}{V_1}\)

2 What is the mechanical advantage of this inclined plane if the length of the ramp is 32 ft. and the height of the green box is 4 ft.?

82% Answer Correctly

	10
	8
	16
	7.2

Solution

The mechanical advantage (MA) of an inclined plane is the effort distance divided by the resistance distance. In this case, the effort distance is the length of the ramp and the resistance distance is the height of the green box:

MA = \( \frac{d_e}{d_r} \) = \( \frac{32 ft.}{4 ft.} \) = 8

3 What's the mechanical advantage of a wedge that's 3 inches wide and 27 inches long?

83% Answer Correctly

	10.5
	3
	13
	9

Solution

The mechanical advantage (MA) of a wedge is its length divided by its thickness:

MA = \( \frac{l}{t} \) = \( \frac{27 in.}{3 in.} \) = 9

4 If the green arrow in this diagram represents 800 ft⋅lb of work, how far will the box move if it weighs 160 pounds?

72% Answer Correctly

	40 ft.
	5 ft.
	320 ft.
	2 ft.

Solution

The Law of Work states that the work put into a machine is equal to the work received from the machine under ideal conditions. In equation form, that's:

W_in = W_out
F_effort x d_effort = F_resistance x d_resistance

In this problem, the effort work is 800 ft⋅lb and the resistance force is 160 lbs. and we need to calculate the resistance distance:

W_in = F_resistance x d_resistance
800 ft⋅lb = 160 lbs. x d_resistance
d_resistance = \( \frac{800ft⋅lb}{160 lbs.} \) = 5 ft.

The science that deals with motion and the forces that produce motion is called which of the following?

57% Answer Correctly

	aeronautics
	physics
	engineering
	mechanics

Solution

Mechanics deals with motion and the forces that produce motion.