Question 157Electricity/Electronics - 1st Asst/Chief70% to pass
A 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its primary current?
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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