ASVAB Mechanical Comprehension Practice Test 340301 Results

Your Results Global Average
Questions 5 5
Correct 0 3.03
Score 0% 61%

Review

1

Which of the following is not a type of simple machine?

58% Answer Correctly

screw

lever

gear

pulley
Solution

The six types of simple machines are the lever, wheel and axle, pulley, inclined plane, wedge, and screw.

2 If the green box weighs 40 lbs. and is 7 ft. from the fulcrum, how far from the fulcrum would a 35 lbs. force need to be applied to balance the lever?
58% Answer Correctly
5 ft.
4 ft.
8 ft.
16 ft.
Solution

To balance this lever the torques at the green box and the blue arrow must be equal. Torque is weight x distance from the fulcrum so the equation for equilibrium is:

Rada = Rbdb

where a represents the green box and b the blue arrow, R is resistance (weight/force) and d is the distance from the fulcrum.

Solving for db, our missing value, and plugging in our variables yields:

db = \( \frac{R_ad_a}{R_b} \) = \( \frac{40 lbs. \times 7 ft.}{35 lbs.} \) = \( \frac{280 ft⋅lb}{35 lbs.} \) = 8 ft.

3

The standard unit of energy is the:

73% Answer Correctly

Horsepower

Joule

Watt

Volt
Solution

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

4

Lisa lifts a 25 pound box from the floor onto a loading dock 4 ft. off the ground. Sam slides the same box along a ramp to move it up another 4 ft. onto a flatbed truck. Who has done more work?

50% Answer Correctly

Lisa

They have done an equal amount of work

Neither have done any work

Sam
Solution

Work is force multiplied by distance. Because both Connie and Sam moved the same weight the same distance they have done an equal amount of work. Sam employed the mechnacial advantage of an inclined plane so he exerted less effort to do the work but the amount of work done was still the same.

5

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

65% Answer Correctly

impact load

static load

dynamic 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.