Question

In a dual slop integrating type digital voltmeter, the first integrating is carried out for 50 periods of the supply frequency of 50 Hz. If the reference voltage used is 10 V, the total conversion time for an input of 40 V is? (a) 3 s (b) 2 s (c) 4 s (d) 1 s This question was addressed to me during an interview. This key question is from Problems on Initial and Final Value Theorem in portion Application of the Laplace Transform in Circuit Analysis of Network Theory Select the correct answer from above options network theory questions and answers, network theory questions pdf, network theory question bank, network theory gate questions and answers pdf, mcq on network theory pdf, gate network theory questions and solutions, network theory mcq Test , ies network theory questions, Network theory Questions for GATE EC Exam, Network Theory MCQ (Multiple Choice Questions)

Answer 1

The correct option is (c) 4 s Explanation: In a dual slope integrating digital voltmeter, (\frac{t_1}{t_2}) Vin = Vref Where, t1 = first integration time = 50 × \frac{1}{50} = 1 But Vin = 40 V and Vref = 10 V ∴ t2 = \frac{V_{in} t_1}{V_{ref}} = 4 s.