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Process Control and Instrumentation

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

Hot wire anemometer
Mass spectrometer
Thermal conductivity cell
Polarograph

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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

1
4
2
3

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Process Control and Instrumentation
Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

- 273° & 80°
32° & 80°
0° & 80°
32° & 460°

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Process Control and Instrumentation
Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?

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

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Process Control and Instrumentation
Thermocouple is suitable for measuring

Both high and low temperatures
Very high temperatures only
Very low temperatures only
Liquid temperatures only

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Process Control and Instrumentation
Meleoid gauge measures the __________ pressure.

Very high
Positive
Atmospheric
Sub-atmospheric

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