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If the equivalent resistance and reactance of the transformer referred to the secondary of a single-phase transformer is 0.6 Ω and 0.8 Ω, respectively, the voltage drop in the transformer when supplying a current of 10 A at 0.8 pf lag is:

If the equivalent resistance and reactance of the transformer referred to the secondary of a single-phase transformer is 0.6 Ω and 0.8 Ω, respectively, the voltage drop in the transformer when supplying a current of 10 A at 0.8 pf lag is: Correct Answer 9.6 V

Concept:

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The voltage drop across impedance 'Z' is given by:

VS - VR = IS (Rcosϕ ± Xsinϕ)

+ for lagging load and - for leading load

where VS - VR = Voltage drop

R = Resistance

X = Reactance

IS = Secondary side current

Calculation:

Given, IS = 10A

R = 0.6Ω 

X = 0.8Ω 

VS - VR = 10(0.6 × 0.8 + 0.8 × 0.6) 

VS - VR = 9.6 V

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