Studied by 10 people
What kind of welding hood is most efficient?
Double canopy hood
What is practical to design for a single welding booth?
Hood and exhaust system
What is practical design for a large number of booths or welders in one work area?
Exhaust the entire room
What kind of ventilation should be above a welding table?
Hood ventilation
Who can you consult about an air intake system?
Ventilation engineer
What gas must be removed from the lab?
Carbon monoxide
Where can exhaust gas removal systems be located?
Underground or overhead
What are the two types of underground tubes used in an exhaust gas removal system?
Concealed or non-concealed
Where are the underground concealed tubes for the exhaust gas removal system located?
Inside the duct under the floor
Where are the underground non-concealed tubes for the exhaust gas removal system located?
Positioned in the duct opening at floor level
What are the tubes used in an exhaust gas removal system made of?
Galvanized steel
Where are flexible tubes for the exhaust gas removal system located?
Suspended from the duct
Where can flexible tubes on the overhead exhaust gas removal system extend to?
Extend to the ceiling or wall
What can be used in welding booths?
Flexible drops
What is a significant hazard in the agricultural lab?
Dust
What is a result of some dust set ups?
Inflammatory process leading to lunch tissue changes
What kind of problem is dust and dirt?
Housekeeping problem
What are the four basic types of dust collectors?
Mechanical (generally a centrifugal separator of low or high pressure)
Fabric (cloth filter)
Wet
Electrical precipitator
What is this dust collection term: CFM?
Air voluntary in cubic feet per minute
What is this dust collection term: FPM?
Velocity of air in feet per minute
What is this dust collection term: SP?
Static pressure expressed in inches water-gage
What are the most common types of dust collectors?
Centrifugal and fabric types
What is the best way to fight a fire?
Prevention
What are the 3 components required for a fire?
Fuel, heat, and air
Fire extinguishers must be approved by ___________.
Underwriters Laboratory, Inc. (UL) and/or Factory Mutual (FM)
How are fire extinguishers rated?
By their fire extinguishing potential
What are Class A fires?
Fires involving paper, wood, cloth, rubber, plastic, and similar materials
What are Class B fires?
Fires involving burning liquids such as gasoline, oils, grease, thinners, paints, cooking fats
What are Class C fires?
Fires involving electrical equipment such as motors, switches, appliances, and other components
What are Class D fires?
Involves burning metals such as magnesium, titanium, and sodium
How do you put out Class A fires?
Can be quenched by water or insulated by general purpose dry chemicals
How do you put out Class B fires?
Smothering action is efficient and/or practical
How do you put out Class C fires?
Nonconducting extinguisher agent is required
How do you put out Class A fires?
With specialized equipment and techniques
What are the types of fire extinguishers?
Water
Foam
Carbon dioxide
Dry chemical
What type of fires is a foam fire extinguisher recommended for?
Class A and B
What type of fires is a carbon dioxide fire extinguisher recommended for?
Class B and C
What type of fires is a dry chemical fire extinguisher recommended for?
Class B and C
How often should you check fire extinguishers?
At least once a year
Where should fire blankets be located in the lab?
Near the welding area
What types of fire extinguishers should be available for instruction areas away from the lab?
Portable fire extinguishers
What are schools required to have?
Fire drills
What is the proper criterion of shock intensity (instead of voltage)?
Current
What are the three parts of Ohm’s law?
A (amperes)
V (volts)
R (ohms)
The number of amperes which flow in the circuit will be directly proportional to what?
Proportional to the pressure in voltage and inversely proportional to the resistance in ohms
Amperes (A) = ?
Voltage (V) ÷ Ohms Resistance (R)
What is the severity of shock dependent on?
Dependent on the rate of current flow, path and current flow, and length of time the body is in the circuit
What does the GFCI detect?
Detects an imbalance of current flow in a circuit and trips in the circuit
The National Electrical Code (NEC) requires the use of _______ in several circuits.
GFCI’s
What is required for extension cords?
GFCI unit
Protection cannot be guaranteed if __________________ of the wiring code has not been followed.
GFCI proper polarity
The amount of current flowing through the body is governed by what?
Governed by the resistance of the body
What does GFCI stand for?
Ground Fault Circuit Interrupter
What does a GFCI do?
Has a sensing device which detects the current flow to the electrical power tool, etc.
Are safety colors (more or less) standardized?
Yes
What is the purpose of safety colors?
To promote safety and reduce the number of accidents
What are the standard safety colors?
Red, orange, yellow, blue, and green
What is safety ORANGE used for?
Designating dangerous parts of machines or energized equipment
What is safety YELLOW used for?
Designating caution or any part that may need adjustment before using the machine
What color is a radiation hazard system?
Safety yellow and safety black
What is safety BLUE used for?
Informational signs
What is safety BLUE used for?
Designating safety
Where can you see safety BLUE?
Medical first aid kits
Gas masks
Stretchers
Safety deluge showers
Safety bulletin boards
What is IVORY used for?
Spotlight color to improve visibility
What should be used for lane application?
Yellow vinyl tape
Where do piping sytems have color?
At their outlets
Lighting includes both _________ and _________ sources.
Natural and artificial sources
What is influenced by color?
Emotional comfort
Safety colors influence student _________ and _________.
Reaction and production
What kind of paint marks danger spots?
Luminescent paints
What should be color coded?
Shop tools and equipment
