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

A Halligan bar acting against a door frame with the contact point as the fulcrum and the firefighter applying force at the far end is a classic first-class lever.

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

On level ground, each person supporting equal distances from the center of mass bears approximately half the load.

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

Hydraulic door rams apply Pascal's Law — fluid pressure is transmitted equally in all directions, allowing a small pump to generate large output forces.

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

Force equals load divided by mechanical advantage: 2,000 divided by 4 equals 500 pounds.

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

Larger fan blades sweep a greater area per revolution, moving more air volume per unit time at the same rotational speed.

FCTC Test Practice Test

FCTC Test Practice Test

FCTC Test Applying Mechanical Reasoning Questions and Answers 2