RHS Vm Test V3

71 Questions | Total Attempts: 52

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RHS Vm Test V3

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Questions and Answers
  • 1. 
    On a four-stroke cycle engine, as the piston begins the intake stroke, what is the position of the valves? 
    • A. 

      Both valves are open. 

    • B. 

      Both valves are closed. 

    • C. 

      The intake valve is open and the exhaust valve is closed. 

    • D. 

      The intake valve is closed, while the exhaust valve is open. 

  • 2. 
    How many revolutions of the crankshaft take place in one complete cycle of a four-stroke cycle engine? 
    • A. 

      1.

    • B. 

      2. 

    • C. 

      3.

    • D. 

      4.

  • 3. 
    The function of a crankshaft’s counterweights is to 
    • A. 

      Allow “snap acceleration.” 

    • B. 

      Prevent lateral movement.

    • C. 

      Allow lateral movement. 

    • D. 

      Prevent vibrations. 

  • 4. 
    All of the following are flywheel functions except 
    • A. 

      Provides smoother engine operation. 

    • B. 

      Used to determine the engine revolutions.

    • C. 

      Contains a ring gear that is used to start the engine.

    • D. 

      Connects the engine crankshaft to the transmission or transaxle. 

  • 5. 
    Identify the components that keep combustion pressure from entering the crankcase.
    • A. 

      Piston seals.

    • B. 

      Piston rings. 

    • C. 

      Piston gaskets.

    • D. 

      Piston bearings. 

  • 6. 
    Which camshaft component do valve lifters or tappets ride on to transfer motion to the rest of the valve train? 
    • A. 

      Cam journal.

    • B. 

      Thrust plate.

    • C. 

      Cam lobe. 

    • D. 

      Cam gear. 

  • 7. 
    Which is not part of the valve spring assembly? 
    • A. 

      Valve spring.

    • B. 

      Lock ring. 

    • C. 

      Retainer.

    • D. 

      Keepers.

  • 8. 
    Which cylinder arrangement is sometimes called a “pancake engine” or “boxer engine”? 
    • A. 

      Inline.

    • B. 

      V-type. 

    • C. 

      W-type. 

    • D. 

      Opposed.

  • 9. 
    The “I-head” engine contains
    • A. 

      Both valves within the block. 

    • B. 

      Both valves within the cylinder head.

    • C. 

      The exhaust valve within the cylinder head and the intake valve within the block. 

    • D. 

      The intake valve within the cylinder head and the exhaust valve within the block.

  • 10. 
    Identify the type of combustion chamber that is dome shaped. 
    • A. 

      Wedge.

    • B. 

      Pancake.

    • C. 

      Pent-roof. 

    • D. 

      Hemispherical. 

  • 11. 
    Which is the result of a swirl combustion chamber?
    • A. 

      It condenses injected fuel. 

    • B. 

      The air and fuel mix becomes a finer mist. 

    • C. 

      It causes a higher compression level before compression stroke. 

    • D. 

      It causes the air temperature to rise before compression stroke occurs.

  • 12. 
    Identify the description that does not describe a two-stroke cycle engine.
    • A. 

      One crankshaft revolution completes a power-producing cycle.

    • B. 

      Two strokes complete all four engine events. 

    • C. 

      Uses reed valves or rotary valves. 

    • D. 

      Produces less exhaust pollution. 

  • 13. 
    Sodium is used in high-performance engine valves to
    • A. 

      Make the valves heavier to prevent valve bounce. 

    • B. 

      Make the valves lighter to prevent valve bounce.

    • C. 

      Help the valves reach higher temperatures. 

    • D. 

      Help the valves stay cooler cool. 

  • 14. 
    What are the two basic types of valve seals? 
    • A. 

      Umbrella and O-ring. 

    • B. 

      Neoprene and O-ring. 

    • C. 

      Umbrella and neoprene. 

    • D. 

      Neoprene and two-piece lip. 

  • 15. 
    “Valve float” is 
    • A. 

      When the valve fails to close entirely. 

    • B. 

      When the valves remain closed when they should be open. 

    • C. 

      An abnormal condition that keeps the valve closed too long. 

    • D. 

      An abnormal condition that allows the valve to open only one-half the proper distance.

  • 16. 
    Some pushrods are hollow to allow
    • A. 

      For ease in manufacturing.

    • B. 

      For proper air/fuel mixture.

    • C. 

      Required timing for the valve train.

    • D. 

      Them to feed oil to the rocker arms.

  • 17. 
    Two common methods for creating variable valve timing are to use a camshaft gear that rotates on the camshaft or 
    • A. 

      A vacuum-advanced camshaft. 

    • B. 

      Electronically controlled valves.

    • C. 

      A continuously variable cam profile.

    • D. 

      Electro-hydraulically operated rocker arms.

  • 18. 
    Identify the two basic types of cylinder sleeves. 
    • A. 

      Wet and dry. 

    • B. 

      Fine and coarse.

    • C. 

      Cast and forged.

    • D. 

      Straight and angled. 

  • 19. 
    Which type pistons are typically used in today’s fuel injected, turbocharged gasoline and diesel engines? 
    • A. 

      Cast iron. 

    • B. 

      Stainless steel. 

    • C. 

      Cast aluminum alloy. 

    • D. 

      Forged aluminum alloy. 

  • 20. 
    The piston part that is described as “a reinforced area around the piston pin hole” is the piston 
    • A. 

      Boss.

    • B. 

      Skirt.

    • C. 

      Head. 

    • D. 

      Ring grooves.

  • 21. 
    Compression rings are usually made of 
    • A. 

      Aluminum. 

    • B. 

      Cast iron. 

    • C. 

      Chrome. 

    • D. 

      Steel. 

  • 22. 
    In engines with balancer shafts, the shafts usually turn 
    • A. 

      Independent of the crankshaft.

    • B. 

      At half the speed of the crankshaft. 

    • C. 

      At the same speed as the crankshaft. 

    • D. 

      At twice the speed of the crankshaft.

  • 23. 
    Identify the condition that will cause diesel fuel to turn cloudy or milky.
    • A. 

      Cold temperatures, causing the separation of cetane from the fuel. 

    • B. 

      Very cold temperatures, causing the separation of wax from the fuel. 

    • C. 

      Hot temperatures, causing the separation of wax from the fuel. 

    • D. 

      Very hot temperatures, causing the separation of cetane from the fuel.

  • 24. 
    Diesel fuel with a high cetane number 
    • A. 

      Ignites easily from heat and pressure. 

    • B. 

      Is necessary in hot weather. 

    • C. 

      Contains more energy. 

    • D. 

      Resists preignition.

  • 25. 
    Flex fuel vehicles are designed to operate on a mixture containing up to 85 percent 
    • A. 

      Ethanol.

    • B. 

      Methanol. 

    • C. 

      Hydrogen.

    • D. 

      Liquefied petroleum gas.

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