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Process Control and Instrumentation

Process Control and Instrumentation
Gain margin is equal to the

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

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Process Control and Instrumentation
Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

Thomson effect
Peltier effect
Joule heating effect
Seebeck effect

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Process Control and Instrumentation
A mercury barometer measures the __________ pressure.

Gauge
Vacuum
Absolute
Atmospheric

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Process Control and Instrumentation
Instrumentation in a plant offers the advantage of

Greater operation economy
Better quality of product
All of these
Greater safety of operation

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Process Control and Instrumentation
Which of the following thermocouples is capable of measuring a temperature of -50°C?

Copper - constantan
Iron-constantan
Platinum - platinum + rhodium
Chromel - alumel

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Process Control and Instrumentation
Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

Kelvin
Centigrade
Fahrenheit
Reaumer

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