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Process Control and Instrumentation

Process Control and Instrumentation
Pirani gauge is used for the measurement of

Very high pressure
Liquid level under pressure
High vacuum
Liquid level at atmospheric pressure

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Process Control and Instrumentation
Which of the following is not a composition measuring instrument?

Mass spectrometer
Polarograph
Thermal conductivity cell
Hot wire anemometer

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Process Control and Instrumentation
Psychrometer determines the

Moisture content of solids
Humidity of gases
Hygroscopic nature of solids
Water of crystallisation

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Process Control and Instrumentation
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K(s + 1)/2(2s + 1)(3s + 1) will have a definite number of loci for variation of K from 0 to ∞. The number of loci is

3
1
2
4

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Process Control and Instrumentation
Which of the following is a desirable characteristic of an instrument?

High fidelity
Poor reproducibility
High measuring lag
High drift

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Process Control and Instrumentation
Polarisation of light forms the working principle of a

Spectrometer
Polarimeter
Polarograph
Chromatograph

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