GATE EE 2018 Set 1 — Question 37
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Electrical & Electronic Measurements → Electrical Quantity Measurement → PMMC & Moving Iron
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Question
A 0-1 Ampere moving iron ammeter has an internal resistance of and inductance of . A shunt coil is connected to extend its range to 0-10 Ampere for all operating frequencies. The time constant in milliseconds and resistance in of the shunt coil respectively are
Correct answer
(A) 2, 5.55
Solution
1.Meter parameters:
Resistance , Inductance .Time constant of the meter .
2.Condition for frequency independence:
To extend the range for all frequencies, the time constant of the shunt coil () must equal the time constant of the meter ()..
3.Extension of range:
Multiplying factor .The shunt resistance is given by:
.Thus, the time constant is and the resistance is . Correct option is (A).
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