Q.

If the two reservoirs are kept at the same level, the head loss is                

A. z1-z2
B. zero
C. t2-t1
D. s2-s1
Answer» B. zero
Explanation: total head loss for a system is equal to the height difference of the reservoirs. height difference is denoted by the letter ‘h’. the height difference between the reservoirs is z1-z2. since they are of the same level, z1=z2. therefore, head loss is zero.
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