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    tnteason's Avatar
    tnteason Posts: 2, Reputation: 1
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    #1

    Mar 11, 2012, 06:41 PM
    An automatic device that operates at present values is known as a what
    An automatic device that operates at preset values is known as a what.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Mar 11, 2012, 06:52 PM
    Please do your own homework.
    thelionking12's Avatar
    thelionking12 Posts: 7, Reputation: 3
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    #3

    Mar 11, 2012, 07:21 PM
    78. An automatic device that operates at present values is known as

    (A) mercury switch
    (B) relay
    (C) fuse
    (D) contactor.

    Get Answer:
    B - Relay

    Source :-
    http://www.electricalquizzes.com/Circuit_Breakers/Circuit_Breakers_MCQs_6.htm

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