CPS FREE CPS Firefighter Test Mechanical Aptitude Principles Questions and Answers 3

Question 1

A firefighter uses a block-and-tackle system with 4 rope segments supporting the load. To lift a 400 lb victim from a confined space, the minimum effort force required (ignoring friction) is:

Accepted Answer

100 lb

Answer

200 lb

Answer

400 lb

Answer

1,600 lb

Question 2

A wrench with a 12-inch handle requires 30 ft-lb of torque to loosen a bolt. If a firefighter switches to an 18-inch handle wrench, the force needed to achieve the same torque is:

Accepted Answer

20 lb

Answer

45 lb

Answer

30 lb

Answer

10 lb

Question 3

A fire engine pump produces pressure of 150 psi. The hose has a cross-sectional area of 3 in². What is the force exerted by the water on a closed nozzle cap?

Accepted Answer

450 lb

Answer

50 lb

Answer

150 lb

Answer

300 lb

Question 4

When a firefighter compresses air into a SCBA cylinder, the temperature of the air inside rises. This best illustrates:

Accepted Answer

Gay-Lussac's Law — pressure and temperature increase together

Answer

Charles's Law — volume increases with temperature

Answer

Boyle's Law — pressure decreases as volume decreases

Answer

The ideal gas law — all variables change equally

Question 5

A firefighter pushes a 300 lb cabinet up a 15-foot ramp that rises 3 feet vertically. Ignoring friction, the mechanical advantage of the ramp is:

Accepted Answer

5

Answer

3

Answer

45

Answer

0.2

Question 6

Two identical fire hoses carry water at the same velocity. Hose A is coiled flat with no kinks; Hose B has a sharp 90-degree kink. Compared to Hose A, Hose B will have:

Accepted Answer

Lower flow rate due to increased resistance at the kink

Answer

Higher flow rate due to increased pressure

Answer

The same flow rate because velocity is equal

Answer

Higher flow rate because the kink creates turbulence that pushes water