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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
3
4
2

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Process Control and Instrumentation
The term analogous to the electrical current in a thermal system is the

None of these
Temperature difference
Heat content in the system
Heat flow rate

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Process Control and Instrumentation
Continuous measurement of specific gravity of a liquid is done by

Both A and C
Hydrometer
Displacement meter
Contact-type electric indicators

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Process Control and Instrumentation
Cascade control means

More than one feed-back loop
Feed forward control
On-off control
One feed-back loop

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Process Control and Instrumentation
Continuous measurement of moisture in paper is done by

High resistance Wheatstone's bridge circuit
Weighing
Hair-hygrometer
Sling psychrometer

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Process Control and Instrumentation
Working principle of disappearing filament type optical pyrometer is based on the

Kirchoff's law
Wien's law
Seebeck effect
Peltier effect

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