FCTC Test Applying Mechanical Reasoning Questions and Answers 3

Question 1

An aerial ladder is extended and supported only at its base turntable and at its tip resting on a building. This is an example of which structural concept?

Accepted Answer

Simply supported beam

Answer

Cantilever beam

Answer

Arch

Answer

Truss

Question 2

A K-12 rotary saw cuts through a steel door. The saw blade applies which type of force to the steel?

Accepted Answer

Shear force

Answer

Tensile force

Answer

Compressive force

Answer

Torsional force

Question 3

A firefighter uses a rope to lower equipment from a window. They loop the rope around a carabiner attached to the window frame to create friction and redirect the force. This creates which type of simple machine?

Accepted Answer

Pulley

Answer

Lever

Answer

Inclined plane

Answer

Wheel and axle

Question 4

When a positive pressure ventilation fan is placed at the entry door, how does it clear smoke from the structure?

Accepted Answer

By pressurizing the interior to push smoke out through a designated exhaust opening

Answer

By pulling smoke out through the exit opening using suction

Answer

By chemically neutralizing smoke particles in the air

Answer

By cooling the smoke until it condenses and drops to the floor

Question 5

A thermal imaging camera shows a wall that appears very bright (high temperature) on the lower half but cool on the upper half. What does this most likely indicate?

Accepted Answer

Fire is burning at or near the base of that wall on the other side

Answer

A window is open on the upper floor allowing air movement

Answer

The wall insulation is significantly thicker on the upper half

Answer

An electrical wire is running at floor level along the wall

Question 6

A door feel check before opening reveals that the door knob is hot but the door surface is cool. What does this most likely indicate about conditions on the other side?

Accepted Answer

Fire is likely burning low on the other side, heating the metal knob by conduction while the wood door surface has not yet heated

Answer

The door is old and retains heat absorbed from direct sunlight

Answer

The room beyond the door is cool and safe to enter

Answer

Heat is radiating downward from above the door frame