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PROCESS CONTROL AND INSTRUMENTATION

Process Control and Instrumentation
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Conductors
Semi conductors
Insulators
Dielectrics

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Process Control and Instrumentation
Gain margin is equal to the

Reciprocal of amplitude ratio
Amplitude ratio
Gain in P-I controller
Gain in P controller

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Process Control and Instrumentation
A sinusoidal variation in the input passing through a linear first order system

Becomes less oscillatory (frequency decreases)
Gets amplified (magnitude increases)
Becomes more oscillatory (frequency increases)
Gets attenuated (magnitude decreases)

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

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

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Process Control and Instrumentation
Pick out the one which is a first order instrument.

Mercury in glass thermometer (without any covering or air gap)
All of these
Bare metallic thermometer
Bare vapor pressure thermometer

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