Principles of Two and Four Stroke Cycle Engines
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Questions and Answers

What is the primary function of the intake event in a four-stroke cycle engine?

  • To remove the burned and unburned gases from the cylinder
  • To fill the cylinder with air or air and fuel (correct)
  • To compress the air or air/fuel mixture into a smaller space
  • To generate power through the combustion of air and fuel

    • In a two-stroke cycle engine, how many degrees of crankshaft rotation are required to complete one cycle?

  • 270°
  • 360° (correct)
  • 540°
  • 180°

    • What is the position of the piston at the beginning of the compression stroke in a four-stroke cycle engine?

  • TDC
  • ATDC
  • BDC
  • BTDC (correct)

    • In a diesel engine, what event occurs towards the end of the compression stroke?

    <p>Injection</p> Signup and view all the answers

    What is the purpose of the power event in a four-stroke cycle engine?

    <p>To generate power through the combustion of air and fuel</p> Signup and view all the answers

    What is the position of the piston at the beginning of the exhaust stroke in a four-stroke cycle engine?

    <p>ABDC</p> Signup and view all the answers

    At what crankshaft angle does the fuel injection occur in a diesel engine?

    <p>23° BTDC</p> Signup and view all the answers

    What happens when the exhaust valve opens in a four-stroke cycle engine?

    <p>Exhaust gases escape under pressure</p> Signup and view all the answers

    What is the term for the period when both the intake and exhaust valves are open in a four-stroke cycle engine?

    <p>Valve overlap</p> Signup and view all the answers

    Why does a four-stroke cycle engine produce more power than a two-stroke cycle engine for a given displacement?

    <p>Because it has a longer effective power stroke</p> Signup and view all the answers

    What is the approximate length of the effective power stroke in a four-stroke cycle engine?

    <p>120 to 140 degrees of crankshaft rotation</p> Signup and view all the answers

    Why are two-stroke cycle diesel engines being replaced in mobile equipment and truck applications?

    <p>Because they have inherently higher exhaust emissions</p> Signup and view all the answers

    What is a common characteristic of heavy-duty two-stroke cycle engines?

    <p>Use of intake ports machined into the cylinder or liner</p> Signup and view all the answers

    What is the primary purpose of scavenging in a two-stroke cycle engine?

    <p>To remove exhaust gases from the cylinder</p> Signup and view all the answers

    What is the characteristic of crankcase scavenging in small gasoline engines?

    <p>Pressurizes air and fuel in the crankcase</p> Signup and view all the answers

    What is the function of the exhaust valves in a two-stroke cycle engine?

    <p>To allow exhaust gas removal</p> Signup and view all the answers

    What is the timing of the injection of fuel in a two-stroke cycle diesel engine?

    <p>At 21° BTDC</p> Signup and view all the answers

    What is the purpose of a blower in a two-stroke cycle engine?

    <p>To pressurize the inlet air</p> Signup and view all the answers

    How many revolutions of the crankshaft are required to complete one cycle in a four-stroke cycle engine?

    <p>Two revolutions</p> Signup and view all the answers

    What is the timing of the intake valve opening in a four-stroke cycle diesel engine?

    <p>20° BTDC</p> Signup and view all the answers

    What is the characteristic of the camshaft in a four-stroke cycle engine?

    <p>Driven at 1/2 crank speed</p> Signup and view all the answers

    What is the purpose of the compression stroke in a two-stroke cycle engine?

    <p>To compress the air/fuel mixture</p> Signup and view all the answers

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