What disrupts the nervous system during an electric shock?
Electrical current passing through the body.
What is the formula for electrical heat energy?
H = I^2 x R x t.
What is a major cause of shop fires?
Overloaded electrical circuits.
Why are frayed wires a fire hazard?
Exposed wires can touch, creating an electrical short.
What must you do before using a machine tool?
Read the machine manual thoroughly and understand its operation.
Should you wear jewelry near machine tools?
No, remove all jewelry, loose clothing, or long hair.
Why are gloves forbidden near rotating machinery?
They can get caught and pull your hand into the machine.
What is an air embolism?
A condition caused by gas bubbles in the blood stream.
What eye injury can an air blow gun cause?
Cornea abrasion.
What invisible hazard do high-pressure air guns pose?
Permanent hearing loss.
What are the three elements of the Fire Triangle?
Fuel, Heat, and Oxygen.
What burns in a Class A fire?
Ordinary combustible materials like wood and paper.
What burns in a Class B fire?
Flammable liquids and gases.
What burns in a Class C fire?
Energized electrical equipment.
What is a water extinguisher’s primary function?
Cooling.
Why avoid water extinguishers on electrical fires?
Because water conducts electricity.
How does a CO2 extinguisher work?
It smothers the fire by displacing oxygen.
What extinguisher is used for Class D (metal) fires?
Special Dry Powder.
Why is Halon being phased out?
It depletes the ozone layer.
