Levers & Gears Quiz

Which of the following is a type of lever where the fulcrum is located between the effort and the load?

• First-class lever

• Second-class lever

• Third-class lever

• Fourth-class lever

In a gear system, if the driving gear has 20 teeth and the driven gear has 40 teeth, what is the gear ratio?

• 1:1

• 1:2

• 2:1

• 1:4

What is the primary function of a pulley in a mechanical system?

• To increase speed

• To change the direction of a force

• To decrease friction

• To store energy

Which type of lever has the load located between the fulcrum and the effort?

• First-class lever

• Second-class lever

• Third-class lever

• Fourth-class lever

How do you calculate the mechanical advantage of a gear system?

• By dividing the number of teeth on the driving gear by the number of teeth on the driven gear

• By adding the number of teeth on both gears

If a pulley system has an efficiency of 80%, what does this mean?

• 80% of the input energy is lost

• 80% of the input energy is converted to useful work

• The system can lift 80% of the load

• The system can only be used 80% of the time

Which type of lever has the effort located between the fulcrum and the load?

• First-class lever

• Second-class lever

• Third-class lever

• Fourth-class lever

What is the gear ratio if the driving gear has 15 teeth and the driven gear has 45 teeth?

• 1:3

• 3:1

• 1:2

• 2:1

Which of the following is NOT a function of a pulley?

• To change the direction of a force

• To increase the speed of an object

• To lift heavy loads

• To reduce the amount of force needed to lift a load

If a lever has an efficiency of 90%, what does this imply?

• 90% of the input force is lost

• 90% of the input force is converted to useful work

• The lever can lift 90% of the load

• The lever can only be used 90% of the time