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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

4
3
1
2

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

Poor reproducibility
High drift
High fidelity
High measuring lag

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Process Control and Instrumentation
Zirconia probe is used for the measurement of

% O₂ in flue gas
Humidity of air
% CO₂ in flue gas
Speed of a submarine

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Process Control and Instrumentation
The thermal emf-temperature relationship of most thermocouples is

Square root
Linear
Exponential
Parabolic

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Process Control and Instrumentation
Stroboscope is used for the measurement of

Liquid level under pressure
Depression of freezing point
Frequency of light
Rpm of a flywheel

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Process Control and Instrumentation
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an

Chromel-alumel thermocouple
Radiation pyrometer
Optical pyrometer
Either B or C

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