Project ForgeInstrumentation & Process Control
Measurement Instruments
GATE 2010
Medium
Flow measuring instruments with different specifications (zero and span) are available for an application that requires flow rate measurements in the range of 300 litres/h to 400 litres/h. The appropriate instrument for this application is the ONE whose specifications are
- Azero=175 litres/h, span=150 litres/h
- Bzero=375 litres/h, span=100 litres/h
- zero=275 litres/h, span=150 litres/h
- Dzero=475 litres/h, span=100 litres/h
Explanation
The instrument's measurable range is [zero, zero+span]. Only zero=275, span=150 gives a range of 275-425, which fully contains the required 300-400 L/h — the other options' ranges (175-325, 375-475, 475-575) fail to cover the entire required span.
Source: GATE CH 2010 (2010)
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