ASVAB Mechanical Comprehension Practice Test 769368 Results

	Your Results	Global Average
Questions	5	5
Correct	0	2.70
Score	0%	54%

Review

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

38% Answer Correctly

	idler gear
	driven gear
	driver gear
	output 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.

2 If A = 6 ft. and the green box weighs 35 lbs. what is the torque acting on the A side of this lever?

74% Answer Correctly

	0 ft⋅lb
	420 ft⋅lb
	210 ft⋅lb
	52 ft⋅lb

Solution

For a lever, torque is weight x distance from the fulcrum which, in this case, is: 35 ft. x 6 lbs. = 210 ft⋅lb

3 If the radius of the axle is 5 and the radius of the wheel is 6, what is the mechanical advantage of this wheel and axle configuration?

41% Answer Correctly

	0.83
	1.2
	6
	-1

Solution

The mechanical advantage of a wheel and axle is the input radius divided by the output radius:

MA = \( \frac{r_i}{r_o} \)

In this case, the input radius (where the effort force is being applied) is 5 and the output radius (where the resistance is being applied) is 6 for a mechanical advantage of \( \frac{5}{6} \) = 0.83

Which of the following is not a characteristic of a ceramic?

61% Answer Correctly

	chemically stable
	low corrosive action
	low density
	high melting point

Solution

Ceramics are mixtures of metallic and nonmetallic elements that withstand exteme thermal, chemical, and pressure environments. They have a high melting point, low corrosive action, and are chemically stable. Examples include rock, sand, clay, glass, brick, and porcelain.

An inclined plane increases ___________ to reduce ____________.

58% Answer Correctly

	force, distance
	force, power
	distance, power
	distance, force

Solution

An inclined plane is a simple machine that reduces the force needed to raise an object to a certain height. Work equals force x distance and, by increasing the distance that the object travels, an inclined plane reduces the force necessary to raise it to a particular height. In this case, the mechanical advantage is to make the task easier. An example of an inclined plane is a ramp.