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How is the reference voltage obtained?(a) from a fixed current source(b) from a variable voltage source(c) from a variable current source(d) from a fixed voltage sourceI have been asked this question in final exam.I want to ask this question from Potentiometric Integrating Type DVM topic in chapter Electronic Instruments of Electrical Measurements

Answer»

The CORRECT answer is (d) from a fixed voltage source

Easiest explanation: Reference voltage is applied to the potentiometer. It is OBTAINED from a source of fixed voltage. The position of the slider on the contact surface DETERMINES the VALUE of the feedback voltage.



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