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Process Control and Instrumentation

Process Control and Instrumentation
Thermal conductivity measurement com-prises the working principle of a

CO₂ analyser
Spectrometer
Polarimeter
Chromatograph

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Process Control and Instrumentation
Which of the following can not measure a temperature of 1600°C ?

Radiation pyrometer
Platinum resistance thermometer
Thermocouple
Photo-electric pyrometer

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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

4
3
2
1

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Process Control and Instrumentation
Nichol's chart deals with

R. vs. phase lag of second order
Closed loop values vs. open loop values
R. vs. phase lag of first order
Frequency response values of controllers

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

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

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Process Control and Instrumentation
Mercury manometer (U-tube type) exemplifies a __________ order system.

Second
First
Zero
Third

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