ASVAB Mechanical Comprehension Practice Test 195768 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.17
Score	0%	63%

Review

1 If A = 4 ft. and the green box weighs 35 lbs. what is the torque acting on the A side of this lever?

74% Answer Correctly

	140 ft⋅lb
	70 ft⋅lb
	0 ft⋅lb
	35 ft⋅lb

Solution

For a lever, torque is weight x distance from the fulcrum which, in this case, is: 35 ft. x 4 lbs. = 140 ft⋅lb

2 90 lbs. of effort is used by a machine to lift a 810 lbs. box. What is the mechanical advantage of the machine?

84% Answer Correctly

	13.5
	18
	9
	9.9

Solution

Mechanical advantage is resistance force divided by effort force:

MA = \( \frac{F_r}{F_e} \) = \( \frac{810 lbs.}{90 lbs.} \) = 9

Which of the following represents the force a surface exerts when an object presses against it?

48% Answer Correctly

	mass
	friction
	normal force
	counter force

Solution

Normal force (F_N) represents the force a surface exerts when an object presses against it.

Specific gravity is a comparison of the density of an object with the density of:

57% Answer Correctly

	oil
	water
	carbon
	air

Solution

Specific gravity is the ratio of the density of equal volumes of a substance and water and is measured by a hyrdometer.

The measure of how much of the power put into a machine is turned into movement or force is called:

56% Answer Correctly

	force multiplication
	efficiency
	power
	mechanical advantage

Solution

The efficiency of a machine describes how much of the power put into the machine is turned into movement or force. A 100% efficient machine would turn all of the input power into output movement or force. However, no machine is 100% efficient due to friction, heat, wear and other imperfections that consume input power without delivering any output.