GATE EE 2024 Set 1 — Question 23

MCQ+1 / -0.33EasyCT & PTInstrument TransformersElectrical & Electronic Measurements

Electrical & Electronic Measurements → Instrument Transformers → CT & PT

Last updated 5 September 2026

Question

The table lists two instrument transformers and their features: Instrument Transformers Features X) Current Transformer (CT) P) Primary is connected in parallel to the grid Y) Potential Transformer (PT) Q) Open circuited secondary is not desirable R) Primary current is the line current S) Secondary burden affects the primary current The correct matching of the two columns is

Instrument Transformers	Features
X) Current Transformer (CT)	P) Primary is connected in parallel to the grid
Y) Potential Transformer (PT)	Q) Open circuited secondary is not desirable
	R) Primary current is the line current
	S) Secondary burden affects the primary current

Correct answer (C) X matches with Q and R; Y matches with P and S. Solution 1. Current Transformer (CT): It is connected in series with the line, so the primary current is the line current (R). The secondary of a CT should never be open-circuited while the primary is energized because it leads to high core flux density, saturation, and dangerously high secondary voltages (Q). Thus, X matches with Q and R. 2. Potential Transformer (PT): It is connected in parallel with the grid to measure voltage (P). Unlike a CT, the secondary burden (load) of a PT directly affects the primary current drawn from the line (S). Thus, Y matches with P and S. Matching these, we get X-Q,R and Y-P,S, which corresponds to option (C). Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (C) X matches with Q and R; Y matches with P and S. Solution 1. Current Transformer (CT): It is connected in series with the line, so the primary current is the line current (R). The secondary of a CT should never be open-circuited while the primary is energized because it leads to high core flux density, saturation, and dangerously high secondary voltages (Q). Thus, X matches with Q and R. 2. Potential Transformer (PT): It is connected in parallel with the grid to measure voltage (P). Unlike a CT, the secondary burden (load) of a PT directly affects the primary current drawn from the line (S). Thus, Y matches with P and S. Matching these, we get X-Q,R and Y-P,S, which corresponds to option (C).

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