Mechanical Comprehension Practice Similar to the ASVAB

pulley4Taking a test like the ASVAB?  Get up to speed with mechanical comprehension practice questions

1. What is mechanical advantage?

a. The ratio of energy input to energy output, typically where the input is less than the output. 
b. The ratio of energy input to energy output, typically where the input is greater than the output. 
c. The ratio of energy resistance to energy output, typically where the resistance is less than the output. 
d. None of the above.

 

2.  What is the ratio of mechanical advantage of a simple pulley? 

a. 2:1
b. 1:1
c. 3:1
d. 1:2

3. If a 100-pound object is sitting on a 10-square-inch plate, what is the PSI? 

a. 5
b. 10
c. 15
d. 20

4. Consider moving an object with a level and a fulcrum.  What is the relationship between the distance from the fulcrum and the speed the object will move?

a. The farther away from the fulcrum, the faster the object will move. 
b. The closer to the fulcrum, the faster an object will move.
c. An object will move the fastest when directly above the fulcrum.
d. None of the above.

5. Which of the following are examples of a wedge?

a. Corkscrew
b. Scissors
c. Wheelbarrow
d. Pulley

6. Which of the following illustrates the principal of the lever? 

a. The greater the distance over which the force is applied, the greater the force required (to lift the load).
b. The greater the distance over which the force is applied, the smaller the force required (to lift the load).
c. The smaller the distance over which the force is applied, the smaller the force required (to lift the load).
d. None of the above.

7. Which of the following is true of the relationship between screws and threads?  

a. The larger the distance between threads, the easier to turn.
b. The smaller the distance between threads, the easier to turn.
c. The smaller the distance between threads, the more difficult to turn.
d. None of the above

8. Which of the following is an example of torque? 

a. The wheel of a pulley turning
b. A piston moving
c. A horse pulling a load
d. A tow truck pulling a vehicle

 

 

Answer Key

1. A
The ratio of energy input to energy output, typically where the input is less than the output.  Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. Ideally, the device preserves the input power and simply trades off forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever. Machine components designed to manage forces and movement in this way are called mechanisms.[i]

2. B
The ratio of mechanical advantage of a simple pulley is 1:1.

3. B
Calculate the PSI by taking the weight divided by the size of the object the weight is bearing on.  100/10 = 10 PSI.

4. A
The farther away from the fulcrum, the faster the object will move.

5. B
Examples of wedges include the cutting edge of scissors, knives, screwdrivers, doorstops, nails axes and chisels.

6. B
The greater the distance over which the force is applied, the smaller the force required (to lift the load).

7. B
The smaller the distance between threads, the easier to turn.

8. A
The wheel of a pulley turning is an example of torque.  Torque, moment or moment of force, is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist to an object.[ii]

 

 

[i] http://en.wikipedia.org/wiki/Ideal_mechanical_advantage#Ideal_mechanical_advantage June 11

[ii] http://en.wikipedia.org/wiki/Torque

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