The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)

• A. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-1.png">
• B. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-2.png">
• C. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-3.png">
• D. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-4.png">