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PROCESS CONTROL AND INSTRUMENTATION

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
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

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

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Process Control and Instrumentation
Which of the following is not classified as a thermo electric pyrometer

Optical pyrometer (disappearing filament type)
Thermocouple
Resistance thermometer
Radiation pyrometer

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Process Control and Instrumentation
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

Platinum-platinum/rhodium
Iron-constantan
None of these
Chromel-alumel

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Process Control and Instrumentation
__________ are analysed using a polarograph.

Liquids
Solids
Gases
Isotonic solutions

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