ASVAB Mechanical Comprehension Practice Test 441295 Results

Your Results Global Average
Questions 5 5
Correct 0 3.23
Score 0% 65%

Review

1 What is the efficiency of a machine has work input of 200 ft⋅lb and work output of 90 ft⋅lb?
67% Answer Correctly
90%
45%
11%
22%
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:
\( Efficiency = \frac{Work_{out}}{Work_{in}} \times 100 \) \( = \frac{90 ft⋅lb}{200 ft⋅lb} \times 100 \) \( = 45% \) %
2

Coplanar forces:

62% Answer Correctly

pass through a common point

act in a common plane

have opposite dimensions

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.

3

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

60% Answer Correctly

concentrated load

impact load

non-uniformly distributed 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.

4

Which of the following is not a type of bridge?

74% Answer Correctly

cable

block

arch

truss
Solution

The six basic bridge forms are beam, truss, arch, cantilever, cable, and suspension.

5

Normal force is generally equal to the __________ of an object.

61% Answer Correctly

coefficient of friction

mass

weight

density
Solution

Normal force arises on a flat horizontal surface in response to an object's weight pressing it down. Consequently, normal force is generally equal to the object's weight.