ASVAB Mechanical Comprehension Practice Test 401543 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.22
Score	0%	64%

Review

1 What is the efficiency of a machine has work input of 155 ft⋅lb and work output of 85 ft⋅lb?

67% Answer Correctly

	55%
	1%
	110%
	13%

Solution

Due to friction, a machine will never be able to utilize 100% of its work input. A certain percentage of that input will be lost in overcoming friction within the machine. Effeciency is a measure of how much of a machine's work input can be turned into useful work output and is calculated by dividing work output by work input and multiplying the result by 100:
\( Efficiency = \frac{Work_{out}}{Work_{in}} \times 100 \) \( = \frac{85 ft⋅lb}{155 ft⋅lb} \times 100 \) \( = 55% \) %

Potential energy is energy that has the potential to be converted into what?

80% Answer Correctly

	power
	work
	heat
	kinetic energy

Solution

Potential energy is the energy of an object by virtue of its position relative to other objects. It is energy that has the potential to be converted into kinetic energy.

The science that deals with motion and the forces that produce motion is called which of the following?

57% Answer Correctly

	physics
	engineering
	aeronautics
	mechanics

Solution

Mechanics deals with motion and the forces that produce motion.

Concurrent forces:

55% Answer Correctly

	act in a common plane
	act in a common dimension
	pass through a common point
	act along the same line of action

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.

What type of load varies with time or affects a structure that experiences a high degree of movement?

66% Answer Correctly

	static 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.