Internal Combustion Engine Basics
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Questions and Answers

What is the primary principle of operation for a diesel engine?

  • Force multiplied by distance
  • Compression ignition (correct)
  • Work equals force divided by distance
  • Spark ignition

    • What is the unit of measurement for force in the Imperial system?

  • Newtons
  • Pounds (correct)
  • Foot-pounds
  • Meters

    • What is the formula for work?

  • Work = distance divided by force
  • Work = force squared
  • Work = force divided by distance
  • Work = force multiplied by distance (correct)

    • What type of ignition is used with fuels such as gasoline and propane?

    <p>Spark ignition</p> Signup and view all the answers

    What is the definition of force?

    <p>The push or pull that attempts to move an object</p> Signup and view all the answers

    What is the unit of measurement for work in the Imperial system?

    <p>Foot-pounds</p> Signup and view all the answers

    What is the unit of measurement for torque in the metric system?

    <p>newton metres</p> Signup and view all the answers

    What is the formula to calculate the area of a cylinder?

    <p>Area = bore2 x 0.7854</p> Signup and view all the answers

    What is the term used to describe the distance that a piston moves from top dead centre to bottom dead centre?

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

    What is the unit of measurement for engine displacement in the imperial system?

    <p>cubic inches</p> Signup and view all the answers

    What is the formula to calculate engine displacement?

    <p>Engine displacement = area of a cylinder x stroke x number of cylinders</p> Signup and view all the answers

    What is the term used to describe the diameter of a cylinder?

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

    What is the unit of measurement for compression ratio?

    <p>Ratio of volumes</p> Signup and view all the answers

    What is the formula to calculate compression ratio?

    <p>CR = CV / V</p> Signup and view all the answers

    What is the relationship between engine displacement and power output?

    <p>Engine displacement is directly proportional to power output</p> Signup and view all the answers

    What is the device used to measure engine torque?

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

    What is the primary reason a diesel engine requires a higher compression ratio than a gasoline engine?

    <p>To heat the air in the cylinder to ignite the fuel</p> Signup and view all the answers

    What is the unit of measurement for heat value in the metric system?

    <p>Kilojoule (kJ)</p> Signup and view all the answers

    What is the percentage of heat energy lost to overcome friction in an internal combustion engine?

    <p>7%</p> Signup and view all the answers

    What is the purpose of a turbocharger or blower in an engine?

    <p>To force the intake air into the cylinder under pressure</p> Signup and view all the answers

    What is the difference between indicated horsepower and brake horsepower?

    <p>Indicated horsepower is the theoretical horsepower, while brake horsepower is the rated horsepower</p> Signup and view all the answers

    What is the formula to calculate brake horsepower?

    <p>bhp = ihp - fhp</p> Signup and view all the answers

    What is the effect of engine speed on volumetric efficiency?

    <p>Volumetric efficiency decreases with engine speed</p> Signup and view all the answers

    What is the percentage of an engine's theoretical power that is typically lost to overcome internal friction?

    <p>64%</p> Signup and view all the answers

    What is the definition of one horsepower?

    <p>The ability to perform 33 000 lb-ft of work in 1 minute</p> Signup and view all the answers

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