OAR OAR Mechanical Comprehension: Simple Machines Questions and Answers 3

Question 1

Which class of lever has the effort applied between the fulcrum and the load?

Accepted Answer

Third class

Answer

First class

Answer

Second class

Answer

None of the above

Question 2

A mechanic uses a 12-inch wrench to turn a bolt with an effective radius of 0.5 inches. What is the ideal mechanical advantage?

Accepted Answer

24

Answer

12

Answer

6

Answer

0.5

Question 3

An inclined plane reduces the force needed to raise an object by increasing which of the following?

Accepted Answer

The distance over which the force is applied

Answer

The weight of the object

Answer

The height of the lift

Answer

The gravitational acceleration

Question 4

A fixed pulley is attached to the ceiling to lift a load. What is the primary advantage of this single fixed pulley?

Accepted Answer

It changes the direction of the applied force

Answer

It doubles the mechanical advantage

Answer

It reduces friction to zero

Answer

It halves the distance the rope must be pulled

Question 5

A knife blade is an example of which simple machine?

Accepted Answer

Wedge

Answer

Inclined plane

Answer

Lever

Answer

Wheel and axle

Question 6

If a screw with a pitch of 0.25 inches is turned using a screwdriver with a handle circumference of 4 inches, what is the ideal mechanical advantage?

Accepted Answer

16

Answer

4

Answer

8

Answer

1