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Process Control and Instrumentation

Process Control and Instrumentation
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

V/nRT
nRT/P
nRT/V
p/nRT

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Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

Iron-constantan
Chromel-alumel
Platinum-platinum + rhodium
Copper-constantan

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 120°
Is 90° at the most
Is 30°
Approaches 180° asymptotically

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

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

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Process Control and Instrumentation
Emf generated in a thermocouple depends on the temperature

Difference between cold junction and atmospheric temperature
Of hot junction only
Difference between hot and cold junctions
Of cold junction only

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Process Control and Instrumentation
Conversion formula for converting amplitude ratio (AR) into decibels is

Decibel = 20 log10 (AR)0.5
Decibel = 20 log10 (AR)
Decibel = 20 loge (AR)0.5
Decibel = 20 loge (AR)

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