Two identical 1 − ϕ transformer of 15kVA, gave the following results, when tested by back to back method.W1 = 1000 watt (Primary)W2 = 1500watt( Secondary )Calculate the percentage efficiency of the transformer at 1/4th load 0.8 P.F. laga)84.55%b)84.56%c)84.57%d)84.58%Correct answer is option 'D'. Can you explain this answer?

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Two identical 1 − ϕ transformer of 15kVA, gave the following results, when tested by back to back method.

W₁= 1000 watt (Primary)

W₂= 1500watt( Secondary )

Calculate the percentage efficiency of the transformer at 1/4^th load 0.8 P.F. lag

a)
84.55%
b)
84.56%
c)
84.57%
d)
84.58%

Correct answer is option 'D'. Can you explain this answer?

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Two identical 1 − ϕ transformer of 15kVA, gave the following results,...

In the back to back test the primary wattmeter gives the iron loss.

Each transformer has iron loss

=W₁ / 2 = 1000 / 2 = 500W and secondary wattmeter reading gives the full load copper loss.

Each transformer has full load copper loss

=W₂ / 2 = 1500 / 2 = 750W

Full load loss at 1/4^th of load is

Efficiency η=

η=0.8458×100%

η=84.58%

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Two identical 1 − ϕ transformer of 15kVA, gave the following results, when tested by back to back method.W1 = 1000 watt (Primary)W2 = 1500watt( Secondary )Calculate the percentage efficiency of the transformer at 1/4th load 0.8 P.F. laga)84.55%b)84.56%c)84.57%d)84.58%Correct answer is option 'D'. Can you explain this answer?

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Two identical 1 − ϕ transformer of 15kVA, gave the following results, when tested by back to back method.W1 = 1000 watt (Primary)W2 = 1500watt( Secondary )Calculate the percentage efficiency of the transformer at 1/4th load 0.8 P.F. laga)84.55%b)84.56%c)84.57%d)84.58%Correct answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Two identical 1 − ϕ transformer of 15kVA, gave the following results, when tested by back to back method.W1 = 1000 watt (Primary)W2 = 1500watt( Secondary )Calculate the percentage efficiency of the transformer at 1/4th load 0.8 P.F. laga)84.55%b)84.56%c)84.57%d)84.58%Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Two identical 1 − ϕ transformer of 15kVA, gave the following results, when tested by back to back method.W1 = 1000 watt (Primary)W2 = 1500watt( Secondary )Calculate the percentage efficiency of the transformer at 1/4th load 0.8 P.F. laga)84.55%b)84.56%c)84.57%d)84.58%Correct answer is option 'D'. Can you explain this answer?.

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