BMEP and Engine Performance Quiz
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Questions and Answers

Which unit is used to measure engine speed?

  • RPM (correct)
  • Compression ratio
  • Torque
  • Horsepower

    • What is the formula for torque?

  • Force plus distance
  • Force minus distance
  • Force times distance (correct)
  • Force divided by distance

    • What is the relationship between torque and lever arm?

  • The longer the lever arm, the greater the torque (correct)
  • The shorter the lever arm, the greater the torque
  • The lever arm has no impact on torque
  • Torque is not affected by the lever arm

    • What is the most common unit of engine power in the U.S.?

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

    What is indicated horsepower?

    <p>The total horsepower developed on the pistons</p> Signup and view all the answers

    What is BMEP?

    <p>A measure of torque per unit of displacement</p> Signup and view all the answers

    What happens to fuel consumption as BMEP is increased?

    <p>Fuel consumption decreases</p> Signup and view all the answers

    Which type of engine may have a better life expectancy than a naturally aspirated engine?

    <p>Engines with high BMEP</p> Signup and view all the answers

    What is the purpose of a dynamometer?

    <p>To measure engine torque</p> Signup and view all the answers

    What is Brake Specific Fuel Consumption (BSFC)?

    <p>The quantity of fuel burned to produce one brake horsepower for one hour</p> Signup and view all the answers

    What is the purpose of the lug torque curve?

    <p>To show the relationship between torque and engine speed</p> Signup and view all the answers

    What happens when an engine operating at or near full load rpm is subjected to a load greater than full load?

    <p>The engine slows down and produces less torque</p> Signup and view all the answers

    What type of loading is common in road vehicles?

    <p>Acceleration loading</p> Signup and view all the answers

    What is the potential torque increase for modern, medium-speed, turbocharged, aftercooled diesels under lug conditions?

    <p>Approximately 20 to 50 percent</p> Signup and view all the answers

    Which axis represents pressure on a Pressure Time (PT) curve?

    <p>Vertical axis</p> Signup and view all the answers

    At what point does pressure reach its maximum on a PT curve?

    <p>Top Center (TC)</p> Signup and view all the answers

    When does fuel injection typically begin on a PT curve?

    <p>During ignition delay</p> Signup and view all the answers

    What is the net work produced by combustion represented by on a PT curve?

    <p>The volume between the two curves</p> Signup and view all the answers

    What is the term for the diameter of each cylinder in an engine?

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

    What is the term for the distance a piston travels up and down within a cylinder?

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

    What is the term for the volume of air which the piston displaces as it moves one stroke?

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

    What is the term for the relationship between the minimum and maximum volumes between the piston crown and the cylinder head?

    <p>Compression ratio</p> Signup and view all the answers

    What is the term for the measurement of engine power?

    <p>Horsepower (hp)</p> Signup and view all the answers

    Which one of these statements is true about the bore and stroke in an engine?

    <p>The bore is determined by the crankshaft radius.</p> Signup and view all the answers

    What determines the length of the stroke in an engine?

    <p>The shape of the crankshaft.</p> Signup and view all the answers

    What connects the crankshaft to the piston in an engine?

    <p>The connecting rod.</p> Signup and view all the answers

    What is the stroke in an engine if the crank radius is 5 inches?

    <p>10 inches.</p> Signup and view all the answers

    What is the formula for calculating bore area in an engine?

    <p>Bore Area = (3.14 x bore squared)/4</p> Signup and view all the answers

    What is the formula for calculating displacement per cylinder in an engine?

    <p>Displacement per Cylinder = Bore Area x Stroke</p> Signup and view all the answers

    What is the compression ratio if the minimum volume in the cylinder is 5 cubic inches and the maximum volume is 25 cubic inches?

    <p>10:1</p> Signup and view all the answers

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