ASVAB Mechanical Comprehension Practice Test 14135 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.30
Score	0%	66%

Review

When all forces acting on a system cancel each other out, this is called:

80% Answer Correctly

	equilibrium
	potential energy
	stasis
	rest

Solution

When a system is stable or balanced (equilibrium) all forces acting on the system cancel each other out. In the case of torque, equilibrium means that the sum of the anticlockwise moments about a center of rotation equal the sum of the clockwise moments.

2 If A = 9 ft. and the green box weighs 40 lbs. what is the torque acting on the A side of this lever?

74% Answer Correctly

	360 ft⋅lb
	90 ft⋅lb
	180 ft⋅lb
	0 ft⋅lb

Solution

For a lever, torque is weight x distance from the fulcrum which, in this case, is: 40 ft. x 9 lbs. = 360 ft⋅lb

The advantage of using a third-class lever is that it increases:

37% Answer Correctly

	the distance traveled by the load
	the speed of the load
	the mechanical advantage of the lever
	the force applied to the load

Solution

A third-class lever is used to increase distance traveled by an object in the same direction as the force applied. The fulcrum is at one end of the lever, the object at the other, and the force is applied between them. This lever does not impart a mechanical advantage as the effort force must be greater than the load but does impart extra speed to the load. Examples of third-class levers are shovels and tweezers.

The force amplification achieved by using a tool, mechanical device or machine system is called:

80% Answer Correctly

	mechanical advantage
	power
	work
	efficiency

Solution

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. Such a device utilizes input force and trades off forces against movement to amplify and/or change its direction.

Gear ratio indicates which of the following about two connected gears?

59% Answer Correctly

	efficiency
	power conversion
	mechanical advantage
	work done

Solution

The mechanical advantage (amount of change in speed or torque) of connected gears is proportional to the number of teeth each gear has. Called gear ratio, it's the ratio of the number of teeth on the larger gear to the number of teeth on the smaller gear. For example, a gear with 12 teeth connected to a gear with 9 teeth would have a gear ratio of 4:3.