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In an orifice meter, if the pressure drop across the orifice is over estimated by 5%, then the percentage error in the measured flow rate is

 
- 2.47
+ 5
+ 2.47
- 5

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Shouldn't the answer be 2.47 instead of -2.47? The flowrate is obviously directly proportional to the square root of pressure. Hence when pressure in over estimated, the flowrate also increases right? Pleaae correct me if i am wrong.