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Instrumentation Engineering

GATE IN concept:short-circuit-tests PYQs

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Question 58

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A short-circuit test is conducted on a single-phase transformer by shorting its secondary. The frequency of input voltage is 1 kHz. The corresponding wattmeter reading, primary current and primary voltage are 8 W, 2 A and 6 V respectively. Assume that the no-load losses and the no-load currents are negligible, and the core has linear magnetic characteristics. Keeping the secondary short, the primary is connected to a 2 V (RMS), 1 kHz sinusoidal source in series with a

mF capacitor. The primary current (RMS) will be _____ A (rounded off to two decimal places).

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