Firefighter Tools and Mechanical Reasoning 2

Question 1

Two gears are meshed together. If the driver gear turns clockwise, which way does the meshed driven gear turn?

Accepted Answer

Counterclockwise

Answer

Two directly meshed gears always rotate in opposite directions.

Question 2

A firefighter uses a longer pry bar to lift a heavy beam. What does the longer handle primarily increase?

Accepted Answer

The mechanical advantage

Answer

A longer lever arm increases mechanical advantage, making the load easier to move.

Question 3

Which tool is best suited for forcing open an inward-swinging door during a fire rescue?

Accepted Answer

Halligan bar

Answer

The Halligan bar is a standard forcible-entry tool designed to pry, twist, and punch through doors.

Question 4

In a pulley system with two supporting rope segments, lifting a 100 lb load ideally requires how much input force (ignoring friction)?

Accepted Answer

50 lb

Answer

Two supporting rope segments halve the required force, so 100 lb needs about 50 lb of input.

Question 5

Water flows through a hose that narrows at the nozzle. What happens to the water's velocity at the narrow point?

Accepted Answer

It increases

Answer

When a fluid passes through a smaller opening, its velocity increases to maintain flow.

Firefighter Practice Test