InterviewSolution
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InterviewSolution
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A microammeter has as resistance of `100 Omega` and full scale range of `50 muA`. It can be used a voltmeter or as ahigher range ammeter provided a resistance is added to it. Pick the correct range and resistance combinations 50 V range with `10 kOmega` resistance in series b.`10 V` range with `200 kOmega` resistance in series c. 5mA rangw with `1Omega` resistance in parallel `10 mA` range with `1Omega` resistance in parallelA. (i),(ii)B. (ii),(iii)C. (iii),(iv)D. all |
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Answer» Correct Answer - B `G = 100 Omega, i_g = 50 mu A` (i) `V = i_g (R + G)` `50 = 50 xx 10^-6 (R + 100) rArr R = (10^6 - 100)ohm` (ii) `(10 = 50 xx 10^-6)(R + 100) rArr R = (2 xx 10^5 - 100) Omega, O.K`. (iii) `(i-i_g) S = i_g G` `(5 xx 10^-3 - 50 xx 10^-6) S = 50 xx 10^-6 xx 100` `S = (1)/(1 - 0.01) = 1.01 Omega, O.K` (iv) `(10 xx 10^-3 - 50 xx 10^-6) S = 50 xx 10^-6 xx 100` `(10 - 50 xx 10^-3) S = 5` `S = (5)/(10 - 0.05) = 0.5 Omega`. |
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