Types of Screwdrivers

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Questions and Answers

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?

  • Hexagonal
  • Star-shaped
  • Cross-shaped (correct)
  • Flat

When was the Allen wrench designed?

  • 1910 (correct)
  • 1930
  • 1900
  • 1920

What makes an offset screwdriver unique?

<p>The shank is set at an angle to the blade (B)</p> Signup and view all the answers

Which company is associated with the name 'Allen' in the context of tools?

<p>Allen Manufacturing Company of Hartford, Connecticut (D)</p> Signup and view all the answers

What type of tip does a flathead screwdriver have?

<p>Flat (B)</p> Signup and view all the answers

Why is the catalytic converter not effective for controlling nitrogen oxides?

<p>It oxidizes hydrocarbons and carbon monoxide (A)</p> Signup and view all the answers

What is the purpose of the positive-crankcase ventilation system in emissions-control systems?

<p>To force unspent or partially spent fuel back into the cylinder (A)</p> Signup and view all the answers

How does the air-injection system contribute to reducing emissions?

<p>By forcing air into the engine's exhaust system (D)</p> Signup and view all the answers

Which emissions-control system helps control nitrogen-oxide emissions by recycling some of the gases back into the cylinders?

<p>Exhaust-gas-recirculation system (D)</p> Signup and view all the answers

If an emissions-control system were missing from a car, what would be a likely consequence?

<p>Reduced engine power (D)</p> Signup and view all the answers

Why can't the catalytic converter alone effectively control all types of pollutants in vehicle exhaust?

<p>It does not convert nitrogen oxides into harmless gases (C)</p> Signup and view all the answers

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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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