Question

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 source

I 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 1

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.