FCTC Test Applying Mechanical Reasoning Questions and Answers 2

Question 1

A Halligan bar is used to pry open a door. The firefighter applies force 18 inches from the fulcrum point at the door frame. What simple machine principle does this demonstrate?

Accepted Answer

First-class lever

Answer

Wheel and axle

Answer

Inclined plane

Answer

Pulley system

Question 2

Two firefighters carry a victim on a stretcher, each holding one end. How is the load distributed between them on level ground?

Accepted Answer

Each firefighter bears approximately half the total load

Answer

The larger firefighter bears the entire load

Answer

The rear firefighter bears most of the load due to gravity

Answer

The front firefighter bears significantly more load than the rear

Question 3

A hydraulic door ram forces entry. The device operates on which principle?

Accepted Answer

Pascal's Law — fluid pressure transmits force equally in all directions

Answer

Bernoulli's principle of fluid flow

Answer

Newton's third law only

Answer

Archimedes' principle of buoyancy

Question 4

A firefighter uses a come-along attached to a vehicle to move it off a victim. If the come-along provides 4:1 mechanical advantage and the vehicle requires 2,000 pounds to move, how much force must the firefighter apply?

Accepted Answer

500 lbs

Answer

250 lbs

Answer

1,000 lbs

Answer

2,000 lbs

Question 5

A ventilation fan is positioned at a doorway. As the blade diameter increases while RPM stays constant, what happens to airflow volume (CFM)?

Accepted Answer

CFM increases

Answer

CFM decreases

Answer

CFM remains constant

Answer

CFM is unrelated to blade diameter

Question 6

A roof ladder is hooked over a ridge and a firefighter hangs from it. What type of load does the hook experience?

Accepted Answer

Tensile load

Answer

Compressive load

Answer

Shear load

Answer

Torsional load