Podcast
Questions and Answers
Why is an Allen wrench sometimes called a hex key?
Why is an Allen wrench sometimes called a hex key?
- Named after the inventor, Allen
- Originating from the Greek word 'hexa' for six
- Due to its design to work with hexagonal screw heads (correct)
- Because it is used for star-shaped screws
What type of screw head does a Phillips screwdriver fit?
What type of screw head does a Phillips screwdriver fit?
- Hexagonal
- Star-shaped
- Cross-shaped (correct)
- Flat
When was the Allen wrench designed?
When was the Allen wrench designed?
- 1910 (correct)
- 1930
- 1900
- 1920
What makes an offset screwdriver unique?
What makes an offset screwdriver unique?
Which company is associated with the name 'Allen' in the context of tools?
Which company is associated with the name 'Allen' in the context of tools?
What type of tip does a flathead screwdriver have?
What type of tip does a flathead screwdriver have?
Why is the catalytic converter not effective for controlling nitrogen oxides?
Why is the catalytic converter not effective for controlling nitrogen oxides?
What is the purpose of the positive-crankcase ventilation system in emissions-control systems?
What is the purpose of the positive-crankcase ventilation system in emissions-control systems?
How does the air-injection system contribute to reducing emissions?
How does the air-injection system contribute to reducing emissions?
Which emissions-control system helps control nitrogen-oxide emissions by recycling some of the gases back into the cylinders?
Which emissions-control system helps control nitrogen-oxide emissions by recycling some of the gases back into the cylinders?
If an emissions-control system were missing from a car, what would be a likely consequence?
If an emissions-control system were missing from a car, what would be a likely consequence?
Why can't the catalytic converter alone effectively control all types of pollutants in vehicle exhaust?
Why can't the catalytic converter alone effectively control all types of pollutants in vehicle exhaust?
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Study Notes
Screwdrivers
- A screwdriver is a tool used to turn screws, with different types of screwdrivers having specialized tips to fit different screw types.
- A flathead screwdriver has a flat tip at the end of the shank.
- A Phillips screwdriver has a cross-shaped tip that fits into Phillips screw heads.
- An Allen wrench (also called a hex key) has a tip that fits into hexagonal screw heads and was designed in 1910 by the Allen Manufacturing Company.
- Offset screwdrivers have a shank set at an angle to the blade, allowing for use in cramped spaces, and can have various types of blades.
Emissions-Control Systems
- Emissions-control systems are designed to filter out pollutants from engine exhaust.
- The combustion process produces pollutants, including carbon monoxide, which are released into the atmosphere through the exhaust pipe.
- Positive-crankcase ventilation is a system that forces unspent or partially spent fuel back into the cylinder to burn.
- The air-injection system forces air into the engine's exhaust system to reuse unburned or partially burned fuel before it exits the exhaust pipe.
- A catalytic converter oxidizes hydrocarbons and carbon monoxide into water vapor and carbon dioxide.
- The exhaust-gas-recirculation system helps control nitrogen-oxide emissions by forcing some of the gases back into the cylinders.
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