Mechanical Aptitude Levers, Pulleys, and Gears Questions and Answers 2

Question 1

In a first-class lever, where is the fulcrum located relative to the effort and load?

Accepted Answer

Between the effort and the load

Answer

In a first-class lever, the fulcrum is located between the effort (input force) and the load (output force). Examples include seesaws, crowbars, and scissors. This arrangement can provide both mechanical advantage and direction change.

Question 2

A compound pulley system with 4 supporting rope segments has what ideal mechanical advantage?

Accepted Answer

4

Answer

The ideal mechanical advantage of a pulley system equals the number of rope segments supporting the load. With 4 supporting segments, the mechanical advantage is 4, meaning you need only one-quarter of the load's weight as input force.

Question 3

When two gears mesh together, in which direction does the driven gear rotate relative to the driving gear?

Accepted Answer

The opposite direction

Answer

When two gears mesh directly (external gears), the driven gear rotates in the opposite direction to the driving gear. The teeth interlock such that one gear pushes the other in the reverse direction at the contact point.

Question 4

A gear with 60 teeth drives a gear with 20 teeth. What is the gear ratio?

Accepted Answer

3:1

Answer

The gear ratio is the number of teeth on the driving gear divided by the number on the driven gear: 60/20 = 3:1. The driven gear rotates 3 times for every 1 rotation of the driving gear, providing speed increase but torque reduction.

Question 5

What type of lever is a wheelbarrow?

Accepted Answer

Second-class lever

Answer

A wheelbarrow is a second-class lever where the load is between the fulcrum (the wheel/axle) and the effort (the handles). This arrangement always provides mechanical advantage, making heavy loads easier to lift.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Levers, Pulleys, and Gears Questions and Answers 2