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    #1

    Antecedent qustion

    The upper part of the engine is the cylinder head. Bolted to the top of the block, it seals the tops of the cylinders. Pistons compress air fuel against the cylinder head prior to ignition. The top of the piston forms the floor of the combustion chamber, and a rod connects its bottom to the crankshaft. Lubricated bearings enable both ends of the connecting rod to pivot, transfering the piston's vertical motion into the crankshaft's rotational force, or torque. The piston's motion rotates the crankshaft at speeds ranging from about 600 to thousands of revolutions per minute(rpm), depending on how much fuel is delivered to the cylinders.


    Which connector is a rotating one?
    1. Bolt
    2. Pivot
    3. Rod
    4. Seal

    1. I don't know the answer of this question. Would you please help me. (Answer key: 2)
    2. My second question is: What part of speech is "pivot" in the bold section?

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    #2

    Re: Antecedent qustion

    (neither an English teacher nor a native speaker)

    Lubricated bearings enable [both ends of the connecting rod] to pivot... (enable to do). What part of speech is this, then?

    I think in this case it is a verb.

    The following link may also help: pivot: definition of pivot in Oxford dictionary (British & World English)
    Last edited by Weaver67; 11-Dec-2013 at 13:48.

  1. Barb_D's Avatar
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    #3

    Re: Antecedent qustion

    I believe the crankshaft rotates.
    I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.

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    #4

    Re: Antecedent qustion

    This is a poor question. They use "pivot" as a verb and then expect you to somehow know that there is a (noun) part called a "pivot" that functions as a "connector."

    You can eliminate "bolt" and "seal" right away as possible answers. The rod moves up and down, not rotationally. So "pivot" must be the right answer.

  2. 5jj's Avatar
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    #5

    Re: Antecedent qustion

    I can't see anything that tells us the pivot rotates.

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    #6

    Re: Antecedent qustion

    Exactly. There is no mention of pivot to be rotating! That's why I was in a quandary!
    Thanks!

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    #7

    Re: Antecedent qustion

    Quote Originally Posted by 5jj View Post
    I can't see anything that tells us the pivot rotates.
    That, too. It doesn't rotate, it wiggles back and forth to allow the up/down motion of the rod to convert to rotational motion of the crankshaft.

  3. 5jj's Avatar
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    #8

    Re: Antecedent qustion

    As Barb said, it's the crankshaft that rotates. However, the text doesn't tell us it's a connector. Another appalling question.

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