Question
Download Solution PDFWhich of the following instruments has uniform scale?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
PMMC ammeters use spring controlling and deflecting torque varies directly as current
In spring control instrument, the controlling torque is given by,
\(Tc = {K_c}\theta\)
\({T_d} \propto I\)
In a PMMC instrument deflecting torque is directly proportional to current.
The final steady state deflection of PMMC instrument is directly proportional to current flowing through the coil.
At equilibrium position, TC = TD
⇒ I ∝ θ
Hence in spring control, the scale is uniformLast updated on Jul 1, 2025
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