Multiple choice

Directions: Carry One Mark Each.

Three parallel pipes connected at the two ends have flow-rates Q1, Q2 and Q3, and the corresponding frictional head losses are hL1, hL2 and hL3, respectively. The correct expressions for total flow rate (Q) and frictional head loss across the two ends (hL) are

  1. Q = Q1 + Q2 + Q3; hL = hL1 + hL2 + hL3

  2. Q = Q1 + Q2 + Q3; hL = hL1 = hL2 = hL3

  3. Q = Q1 = Q2 = Q3; hL = hL1 + hL2 + hL3

  4. Q = Q1 = Q2 = Q3; hL = hL1 = hL2 = hL3

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B Correct answer
Explanation