Question 157Electricity & Electronics - 1st Asst/Chief
70% to passA 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its primary current?
A11.36 A
B14.2 A
C45.45 A
D56.82 A
AI Explanation
The correct answer is B) 14.2 A. To calculate the primary current, we need to use the formula: Primary Current = (Load Power) / (Voltage × Power Factor). Given: - Transformer voltage: 440/110 V single phase - Load power: 5 kW - Power factor: 0.8 Plugging these values into the formula: Primary Current = (5 kW) / (440 V × 0.8) Primary Current = 14.2 A The other options are incorrect because: A) 11.36 A is too low, as it does not account for the power factor. C) 45.45 A is too high, as it does not use the correct transformer voltage. D) 56.82 A is too high, as it does not use the correct power factor.
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