GATE 2015 EE (EE2) – Question 15

Electrical and Electronic Measurements · Measurement of voltage, current, power, energy and power factor · 1 mark · Multiple choice

Match P: permanent-magnet moving coil; Q: moving iron through a current transformer; R: rectifier instrument; S: electrodynamometer, to 1: DC only; 2: AC only; 3: AC and DC.

P1,Q2,R1,S3
P1,Q3,R1,S2
P1,Q2,R3,S3
P3,Q1,R2,S1

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Show answer and explanation

Correct answer: (C) P1,Q2,R3,S3

Explanation

PMMC directly measures DC, so P→1. A current transformer requires changing flux and therefore AC, so Q→2. A rectifier instrument can respond to AC after rectification and to DC, R→3. Electrodynamometer torque depends on the product of coil currents and works on both AC and DC, S→3. The match is **C**.

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