Project ForgeInstrumentation & Process Control
Measurement Instruments
GATE 2011
Medium
In an orifice meter, if the pressure drop across the orifice is overestimated by 5%, then the PERCENTAGE error in the measured flow rate is
- +2.47
- B+5
- C−2.47
- D−5
Explanation
Q∝√(ΔP). If measured ΔP is 1.05× the true value, measured Q=√1.05×Q_true=1.0247×Q_true — a +2.47% error.
Source: GATE CH 2011 (2011)
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