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Process Control and Instrumentation

Process Control and Instrumentation
A barometer measures the __________ pressure.

Absolute
Gauge
Absolute as well as gauge
Dynamic

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Process Control and Instrumentation
Which is the most suitable instrument for measuring pressure below 3 microns?

Alphatron
Ionisation gauge
Bourdon guage
Mcleoid gauge

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Process Control and Instrumentation
Bourdon gauges are used for measuring pressure (kg/cm² )

< 2 (gauge)
< atmospheric
> 2 (gauge)
> 10 (absolute)

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Process Control and Instrumentation
Flow rate through an orifice is __________ the pressure differential.

Inversely proportional to the square root of
Inversely proportional to the square of
Proportional to
Proportional to the square root of

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Process Control and Instrumentation
On-off controllers are normally used for

Low loads
Temperature changes
None of these
Flow rate changes

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Process Control and Instrumentation
An amplitude ratio of 0.1 corresponds to __________ decibels.

20
-10
-20
10

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