NFSI NFSI Mechanical Aptitude and Spatial Reasoning

Question 1

A firefighter needs to determine which direction a gear will turn if the driving gear rotates clockwise. If two gears mesh directly, the driven gear will turn:

Accepted Answer

Counterclockwise

Answer

Clockwise

Answer

The same direction as the driver

Answer

It depends on gear size

Question 2

A hose is coiled on a rack at a height of 8 feet. If a firefighter pulls 15 feet of hose off the rack, what is the minimum straight-line distance the hose end can reach from directly below the rack?

Accepted Answer

12.7 feet

Answer

7 feet

Answer

15 feet

Answer

23 feet

Question 3

Which simple machine is most directly used when a firefighter operates a pry bar to open a door?

Accepted Answer

Lever

Answer

Pulley

Answer

Wheel and axle

Answer

Inclined plane

Question 4

A standpipe valve handle is stuck. A firefighter uses a 12-inch wrench to apply torque. Compared to a 6-inch wrench with the same applied force, the torque produced is:

Accepted Answer

Twice as much

Answer

Equal

Answer

Half as much

Answer

Four times as much

Question 5

Looking at a floor plan where north is up, a firefighter enters a building facing north, turns right, then turns right again. The firefighter is now facing:

Accepted Answer

South

Answer

North

Answer

East

Answer

West

Question 6

A block and tackle system has 4 rope segments supporting the load. If the load weighs 400 pounds, approximately how much force must the firefighter apply to lift it (ignoring friction)?

Accepted Answer

100 lbs

Answer

400 lbs

Answer

200 lbs

Answer

50 lbs