engineering recuitment NCRTC Junior Engineer Mock Test Series 2025 Network Theory Network Elements

यदि Δ प्रतिबाधा Za, Zb और Zc हैं और Y प्रतिबाधा Z1, Z2 और Z3 हैं, तो निम्नलिखित में से कौन सा संबंध सही है?

1
Z1 = ZaZbZc
2
\({Z_1} = \frac{1}{{{Z_a} + {Z_b} + {Z_c}}}\)
3
Z­1 = Za + Zb + Zc
4
\({Z_1} = \frac{{{Z_b}{Z_c}}}{{{Z_a} + {Z_b}+{Z_c}}}\)
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