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In olden days voltmeters were __________(a) made of transistors(b) made of vaccum tubes(c) made of transformers(d) made of diodesI have been asked this question in homework.The origin of the question is Advantages of Electronic Instruments in chapter Electronic Instruments of Electrical Measurements

Answer»

Correct choice is (b) made of VACCUM tubes

Easy explanation: INITIALLY, voltmeters were made of vaccum tubes. These voltmeters were known as vaccum TUBE voltmeters (VTVM).



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