FCTC Test Pulleys, Gears, and Levers Questions and Answers 5

Question 1

A firefighter uses a Halligan bar as a lever to force open a door. Moving the fulcrum closer to the load will:

Accepted Answer

Increase the mechanical advantage

Answer

Moving the fulcrum closer to the load lengthens the effort arm relative to the load arm, increasing mechanical advantage.

Question 2

Two gears mesh together: the driver has 20 teeth spinning at 100 RPM and the driven gear has 50 teeth. What is the speed of the driven gear?

Accepted Answer

40 RPM

Answer

Speed ratio = teeth of driver ÷ teeth of driven = 20/50, so driven gear speed = 100 × (20/50) = 40 RPM.

Question 3

A rope rescue team rigs a 2:1 pulley system. If they pull 10 feet of rope, how high does the victim rise?

Accepted Answer

5 feet

Answer

With a 2:1 system the load rises half the distance the rope is pulled: 10 ÷ 2 = 5 feet.

Question 4

Which class of lever always has a mechanical advantage less than 1?

Accepted Answer

Third class

Answer

Third-class levers always have the effort between the fulcrum and the load, resulting in a mechanical advantage less than 1 but greater speed and range.

Question 5

Two gears of equal size are meshed together. A drives B at 200 RPM. What speed does Gear B rotate at?

Accepted Answer

200 RPM

Answer

Gears with equal numbers of teeth have a 1:1 ratio, so Gear B rotates at the same 200 RPM as Gear A.

FCTC Test Practice Test

FCTC Test Practice Test

FCTC Test Pulleys, Gears, and Levers Questions and Answers 5