ASVAB Mechanical Comprehension Practice Test 576413 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.56
Score	0%	71%

Review

1 If input effort is 300 ft⋅lb, what output effort will be produced by a machine with a mechanical advantage of 3?

79% Answer Correctly

	3600ft⋅lb
	225ft⋅lb
	1800ft⋅lb
	900 ft⋅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 3 will multiply an input effort of 300 ft⋅lb by 3 to produce an output effort of 900 ft⋅lb.

2 If A = 3 ft. and the green box weighs 35 lbs. what is the torque acting on the A side of this lever?

75% Answer Correctly

	420 ft⋅lb
	105 ft⋅lb
	315 ft⋅lb
	35 ft⋅lb

Solution

For a lever, torque is weight x distance from the fulcrum which, in this case, is: 35 ft. x 3 lbs. = 105 ft⋅lb

The standard unit of energy is the:

73% Answer Correctly

	Joule
	Horsepower
	Volt
	Watt

Solution

The Joule (J) is the standard unit of energy and has the unit \({kg \times m^2} \over s^2\).

The measure of how much of the power put into a machine is turned into movement or force is called:

56% Answer Correctly

	power
	mechanical advantage
	efficiency
	force multiplication

Solution

The efficiency of a machine describes how much of the power put into the machine is turned into movement or force. A 100% efficient machine would turn all of the input power into output movement or force. However, no machine is 100% efficient due to friction, heat, wear and other imperfections that consume input power without delivering any output.

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

74% Answer Correctly

	non-uniformly distributed load
	dynamic load
	impact load
	concentrated 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.