GATE EE 2018 Set 1 — Question 11
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Electrical Machines → Single-Phase Transformers → Voltage Regulation
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Question
A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5% across its series impedance at full load. Of this, 3% is due to resistance. The percentage regulation of the transformer at full load with 0.8 lagging power factor is
Correct answer
(A) 4.8
Solution
Given:
Voltage drop across series impedance,
Voltage drop across resistance,
We know that
(or 4%)
Power factor lagging
Percentage regulation for lagging power factor is given by:
Thus, the correct option is (A).
Voltage drop across series impedance,
Voltage drop across resistance,
We know that
(or 4%)
Power factor lagging
Percentage regulation for lagging power factor is given by:
Thus, the correct option is (A).
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