If copper losses of a single-phase transformer at 50% of rated current are 1500 W, then copper losses at full load is equal to:

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MPPGCL JE Electrical 28 April 2023 Shift 1 Official Paper
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  1. 15,000 W
  2. 3000 W
  3. 4500 W
  4. 6000 W

Answer (Detailed Solution Below)

Option 4 : 6000 W
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Detailed Solution

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Concept

The copper loss of a 1ϕ transformer is given by:

where, Pcu = Copper loss 

Pcufl = Copper loss at full load

x = Fraction of loading

Calculation

Given, Pcu = 1500 W

x = 50% = 0.5

Pcufl = 6000 W

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