# If (L) is the total head at inlet and (1) is the head loss due to friction, efficiency of power transmission through a straight pipe is given by

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If (L) is the total head at inlet and (1) is the head loss due to friction, efficiency of power transmission  through a straight pipe is given by
1. $\frac{{L - 1}}{L}$
2. $\frac{{L - 1}}{{L + 1}}$
3. $\frac{L}{{L + 1}}$
4. $\frac{L}{{L - 1}}$

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Correct Answer - Option 1 : $\frac{{L - 1}}{L}$

Explanation:

The efficiency of power transmission:

L= Total head at the inlet

1= Head loss due to friction

Head available at the outlet of the pipe = Head at the inlet - Head loss due to friction

Head available at the outlet of the pipe = L - 1

The efficiency of power transmission = Head available at the outlet / Head at the inlet

The efficiency of power transmission = $\frac{{L - 1}}{L}$