GATE EE 2022 Set 1 — Question 18
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Electrical & Electronic Measurements → Bridges & Potentiometers → Error Analysis
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Question
A balanced Wheatstone bridge has the following arm resistances:
; ; is an unknown resistance;
. The value of and its accuracy is
; ; is an unknown resistance;
. The value of and its accuracy is
Correct answer
(B) 30 Ω ± 0.9 Ω
Solution
For a balanced Wheatstone bridge, the product of opposite arm resistances is equal:The relative limiting error in is the sum of the relative limiting errors of the other arms:The absolute error in is:Thus, the value of and its accuracy is .
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