ASVAB Mechanical Comprehension Practice Test 988791 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.01
Score	0%	60%

Review

What is work?

60% Answer Correctly

	The movement of an object by a force
	The potential for exertion
	Force per unit time
	Force per unit distance

Solution

Work is accomplished when force is applied to an object: W = Fd where F is force in newtons (N) and d is distance in meters (m). Thus, the more force that must be applied to move an object, the more work is done and the farther an object is moved by exerting force, the more work is done. By definition, work is the displacement of an object resulting from applied force.

The mass of an object correlates to the size of the object but ultimately depends on:

66% Answer Correctly

	the object's potential energy
	the object's weight
	gravity
	the object's density

Solution

Mass is a measure of the amount of matter in an object. In general, larger objects have larger mass than smaller objects but mass ultimately depends on how compact (dense) a substance is.

What's the last gear in a gear train called?

38% Answer Correctly

	idler gear
	driven gear
	output gear
	driver gear

Solution

A gear train is two or more gears linked together. Gear trains are designed to increase or reduce the speed or torque outpout of a rotating system or change the direction of its output. The first gear in the chain is called the driver and the last gear in the chain the driven gear with the gears between them called idler gears.

What type of load acts on a relatively small area of a structure?

75% Answer Correctly

	non-uniformly distributed load
	concentrated load
	dynamic load
	impact 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.

5 A = 7 ft., the green box weighs 50 lbs., and the blue box weighs 90 lbs. What does distance B need to be for this lever to balance?

65% Answer Correctly

	0 ft.
	1.94 ft.
	15.56 ft.
	3.89 ft.

Solution

In order for this lever to balance, the torque acting on side A must equal the torque acting on side B. Torque is weight x distance from the fulcrum which means that the following must be true for the lever to balance:

f_Ad_A = f_Bd_B

For this problem, the equation becomes:

50 lbs. x 7 ft. = 90 lbs. x d_B

d_B = \( \frac{50 \times 7 ft⋅lb}{90 lbs.} \) = \( \frac{350 ft⋅lb}{90 lbs.} \) = 3.89 ft.