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Process Control and Instrumentation

Process Control and Instrumentation
Measurement of sub-zero Celcius temperature in industry is done most commonly by

Bi-metallic thermometers
Gas thermometers
Resistance thermometers
Thermocouples

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Process Control and Instrumentation
Liquid argon level in a pressurised storage tank (at 3 kg/cm² ) is measured by a/an

None of these
External float gage
Differential pressure gage
Gage glass

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Process Control and Instrumentation
The operation of a rotameter is based on

Rotation of a turbine
Pressure drop across a nozzle
Pressure at a stagnation point
Variable flow area

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Process Control and Instrumentation
In second order underdamped system,

Decay ratio = (overshoot)²
Overshoot increases for increasing damping co-efficient
Decay ratio = overshoot
Large damping co-efficient means smaller damping

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Process Control and Instrumentation
Which of the following is an undesirable dynamic characteristic of an instrument?

Static error
Dead zone
Reproducibility
Time lag

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Process Control and Instrumentation
Which of the following is not a differential pressure flow meter?

Venturimeter
Orificemeter
Flow nozzle
Rotameter

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