# 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 Posts: 5,199, Reputation: 1401 Electrical & Lighting Expert #2 Mar 11, 2012, 07:52 PM

 thelionking12 Posts: 7, Reputation: 10 Junior Member #3 Mar 11, 2012, 08:21 PM
78. An automatic device that operates at present values is known as

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

B - Relay

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

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