ASVAB Mechanical Comprehension Practice Test 214920 Results

	Your Results	Global Average
Questions	5	5
Correct	0	2.88
Score	0%	58%

Review

One Horsepower (hp) is equal to how many watts?

76% Answer Correctly

	746
	1
	9.8
	1492

Solution

Power is the rate at which work is done, P = w/t, or work per unit time. The watt (W) is the unit for power and is equal to 1 joule (or newton-meter) per second. Horsepower (hp) is another familiar unit of power used primarily for rating internal combustion engines. 1 hp equals 746 watts.

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

37% Answer Correctly

	the mechanical advantage of the lever
	the distance traveled by the load
	the speed of the load
	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.

What type of load creates different stresses at different locations on a structure?

60% Answer Correctly

	impact load
	non-uniformly distributed load
	static uniformly distributed load
	dynamic load

Solution

A concentrated load acts on a relatively small area of a structure, a static uniformly distributed load doesn't create specific stress points or vary with time, a dynamic load varies with time or affects a structure that experiences a high degree of movement, an impact load is sudden and for a relatively short duration and a non-uniformly distributed load creates different stresses at different locations on a structure.

Coplanar forces:

62% Answer Correctly

	pass through a common point
	act along the same line of action
	have opposite dimensions
	act in a common plane

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.

5 How much work can a 8 hp engine do in 9 seconds?

52% Answer Correctly

	4 ft⋅lb
	39600 ft⋅lb
	16 ft⋅lb
	2 ft⋅lb

Solution

Horsepower (hp) is a common measure of power output for complex machines. By definition, a 1 hp machine does 550 ft⋅lb of work in 1 second: 1 hp = 550 ft⋅lb/s. Substituting the variables for this problem gives us:
\( W = 8 hp \times 550 \frac{ft⋅lb}{s} \times 9s = 39600 ft⋅lb \)