ASVAB Mechanical Comprehension Practice Test 884213 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.13
Score	0%	63%

Review

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

57% Answer Correctly

	air
	carbon
	oil
	water

Solution

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

2 If input effort is 400 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 5?

79% Answer Correctly

	2000 ft⋅lb
	500ft⋅lb
	1000ft⋅lb
	4000ft⋅lb

Solution

Mechanical advantage is the ratio of output force to input force and tells us by how many times a machine multiplies input effort. So, a machine with a mechanical advantage of 5 will multiply an input effort of 400 ft⋅lb by 5 to produce an output effort of 2000 ft⋅lb.

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

61% Answer Correctly

	low corrosive action
	chemically stable
	high melting point
	low density

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.

What type of load doesn't create specific stress points or vary with time?

60% Answer Correctly

	concentrated load
	non-uniformly distributed load
	impact load
	static uniformly distributed 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.

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

59% Answer Correctly

	efficiency
	work done
	mechanical advantage
	power conversion

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.