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Process Control and Instrumentation

Process Control and Instrumentation
Flame photometry is used for the determination of compositional analysis of

Natural gas
Alkali metals
Isotopes
Solids

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Integral control action is introduced
Derivative control action is introduced
Kc is reduced
Kc is increased

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Process Control and Instrumentation
Phase margin is equal to

Phase lag - 180°
180° - phase lag
Phase lag + 180°
Phase lag + 90°

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

High thermal conductivity
Small specific heat
All of these
Large area but small mass

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Process Control and Instrumentation
The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

All of these
Pressure
Volume
Viscosity

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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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